{"id":3440,"date":"2025-04-14T13:12:51","date_gmt":"2025-04-14T13:12:51","guid":{"rendered":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/?p=3440"},"modified":"2025-04-28T07:47:33","modified_gmt":"2025-04-28T07:47:33","slug":"common-underfloor-heating-problems","status":"publish","type":"post","link":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/","title":{"rendered":"Problems with Underfloor Heating: 15 Common Underfloor Heating Problems To Fix"},"content":{"rendered":"\n<p><strong>Underfloor heating is great\u2014until it stops working properly. What are the most common underfloor heating problems, and how can they be easily resolved?<\/strong><\/p>\n\n\n\n<p>If you\u2019re dealing with underfloor heating problems, whether it\u2019s a cold patch on the floor or a system that won\u2019t switch off, you\u2019re not alone. Like any other <a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/central-heating-systems\/\">central heating system<\/a>, underfloor heating is not without its faults. Fortunately, by recognising these problems with underfloor heating early on, they can easily be fixed before they get progressively worse. In this article, we will look at the most common underfloor heating problems, alongside how to spot the causes and resolve them. From single-zone issues and airlocks to faulty thermostats and pressure drops, we\u2019ll cover both water underfloor heating, and electric underfloor systems. You\u2019ll also learn when a quick reset is enough\u2014and when it\u2019s time to <a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/contact\">call a professional<\/a>.<\/p>\n\n\n\n<p><strong>Key Points<\/strong>:<\/p>\n\n\n<ul style=\"background-color: #F4F4F4; padding: 1em; border-radius: 6px;\">\n<li>What causes underfloor heating to stop working<\/li>\n<li>How to fix cold zones, stuck pumps, or inconsistent heating<\/li>\n<li>Signs of thermostat, actuator, and wiring issues<\/li>\n<li>Pressure problems and what they mean<\/li>\n<li>Common electric underfloor heating faults and how to spot them<\/li>\n<\/ul>\n\n<div style=\"max-width: -moz-fit-content; \" class=\"wp-block-ub-table-of-contents-block ub_table-of-contents ub_table-of-contents-collapsed\" id=\"ub_table-of-contents-71affe6e-7cf2-4a1b-a59d-7c617e17d511\" data-linktodivider=\"false\" data-showtext=\"show\" data-hidetext=\"hide\" data-scrolltype=\"auto\" data-enablesmoothscroll=\"false\" data-initiallyhideonmobile=\"false\" data-initiallyshow=\"false\"><div class=\"ub_table-of-contents-header-container\" style=\"\">\n\t\t\t<div class=\"ub_table-of-contents-header\" style=\"text-align: left; \">\n\t\t\t\t<div class=\"ub_table-of-contents-title\">In this article:<\/div>\n\t\t\t\t<div class=\"ub_table-of-contents-header-toggle\">\n\t\t\t<div class=\"ub_table-of-contents-toggle\" style=\"\">\n\t\t\t\u00a0[<a class=\"ub_table-of-contents-toggle-link\" href=\"#\" style=\"\">show<\/a>]\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div><div class=\"ub_table-of-contents-extra-container\" style=\"\">\n\t\t\t<div class=\"ub_table-of-contents-container ub_table-of-contents-1-column ub-hide\">\n\t\t\t\t<ul style=\"\"><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#0-9-water-underfloor-heating-problems\" style=\"\">9 Water Underfloor Heating Problems<\/a><ul><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#1-1-single-zone-is-not-heating-up\" style=\"\">1. Single Zone Is Not Heating Up<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#2-2-underfloor-heating-actuator-problems\" style=\"\">2. Underfloor Heating Actuator Problems<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#3-3-underfloor-heating-thermostat-problems\" style=\"\">3. Underfloor Heating Thermostat Problems<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#4-4-problems-with-other-underfloor-heating-parts\" style=\"\">4. Problems With Other Underfloor Heating Parts<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#5-5-multiple-zones-or-entire-system-is-not-heating-up\" style=\"\">5. Multiple Zones or Entire System Is Not Heating Up<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#6-6-all-zones-are-not-heating\" style=\"\">6. All Zones Are Not Heating<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#7-7-rise-in-underfloor-heating-system-pressure-pressure-testing\" style=\"\">7. Rise in Underfloor Heating System Pressure (Pressure Testing)<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#8-8-expansion-vessel-issues\" style=\"\">8. Expansion Vessel Issues<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#9-9-pressure-drop-on-system-boiler-locking-out\" style=\"\">9. Pressure Drop on System (Boiler Locking Out)<\/a><\/li><\/ul><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#10-6-electric-underfloor-heating-problems\" style=\"\">6 Electric Underfloor Heating Problems<\/a><ul><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#11-10-electric-underfloor-heating-won%E2%80%99t-turn-off-or-isn%E2%80%99t-warming-up\" style=\"\">10. Electric Underfloor Heating Won\u2019t Turn Off or Isn\u2019t Warming Up<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#12-11-floor-isn%E2%80%99t-getting-warm-enough\" style=\"\">11. Floor Isn\u2019t Getting Warm Enough<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#13-12-damaged-or-cut-heating-cable\" style=\"\">12. Damaged or Cut Heating Cable<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#14-13-unexpected-running-costs\" style=\"\">13. Unexpected Running Costs<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#15-14-mistakes-during-installation\" style=\"\">14. Mistakes During Installation<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#16-15-airlocks-and-pressure-problems-shared-with-wet-systems\" style=\"\">15. Airlocks and Pressure Problems (Shared with Wet Systems)<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#17-are-underfloor-heating-systems-supposed-to-be-airtight\" style=\"\">Are underfloor heating systems supposed to be airtight?<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#18-why-is-my-floor-not-reaching-the-desired-temperature\" style=\"\">Why is my floor not reaching the desired temperature?<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#19-faqs\" style=\"\">FAQs<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/common-underfloor-heating-problems\/#20-sources\" style=\"\">Sources<\/a><\/li><\/ul><\/li><\/ul>\n\t\t\t<\/div>\n\t\t<\/div><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"0-9-water-underfloor-heating-problems\">9 Water Underfloor Heating Problems<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><a ref=\"magnificPopup\" href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-content\/uploads\/2025\/02\/problems-with-underfloor-heating-water.jpg\"><img decoding=\"async\" width=\"720\" height=\"480\" src=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-content\/uploads\/2025\/02\/problems-with-underfloor-heating-water.jpg\" alt=\"problems with underfloor heating water\" class=\"wp-image-3606\" srcset=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-content\/uploads\/2025\/02\/problems-with-underfloor-heating-water.jpg 720w, https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-content\/uploads\/2025\/02\/problems-with-underfloor-heating-water-300x200.jpg 300w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/a><\/figure>\n\n\n\n<p><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/water-underfloor-heating\">Wet underfloor heating systems<\/a> are reliable, but like any setup, they can sometimes stop working as expected. This is not helped by the fact that they can be more delicate to install than electric underfloor heating.&nbsp;<\/p>\n\n\n\n<p>Below are some of the most common underfloor heating problems associated with wet underfloor heating systems, what causes them, and how to fix them.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-1-single-zone-is-not-heating-up\">1. Single Zone Is Not Heating Up\/Underfloor Heating Not Working In One Room<\/h3>\n\n\n\n<p>Underfloor heating can be divided into <a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/multi-zone-heating-for-underfloor\/\/\">multi-zone heating<\/a>. If one part of your floor stays cold while the rest works fine, the problem is often easy to find and fix. This can happen in either older systems or new installations and usually points to one of a few common issues.<\/p>\n\n\n\n<p>If your underfloor heating is not working in one room, this is likely because there is a problem with the thermostat not correctly sending a signal to the underfloor heating manifold. Of course, there could be an air bubble issue here, an actuator fault, or there is not enough water or electric passing through the single heating zone.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-2-underfloor-heating-actuator-problems\">2. Underfloor Heating Actuator Problems<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sticky pin valve underneath an actuator: <\/strong>Each actuator controls flow to a single loop of pipe. If one zone isn\u2019t heating, remove the actuator and check if the small pin underneath is stuck. Use silicone spray or long-nose pliers to free it. This often solves the problem without needing to replace anything.<\/li>\n\n\n\n<li><strong>Actuator has failed completely: <\/strong>If the pin moves freely but there\u2019s still no heat, the actuator itself might have failed. This is often down to an electrical fault, especially if the underfloor heating won\u2019t turn off or seems stuck on. At this point, it\u2019s best to get an electrician to check the wiring or replace the actuator.<br><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-3-underfloor-heating-thermostat-problems\">3. Underfloor Heating Thermostat Problems<\/h3>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Faulty thermostat or low battery: <\/strong>Thermostats that run on batteries can lose signal or fail when batteries are flat. Always check and replace the batteries first. If that doesn\u2019t work, follow the user manual to reset the thermostat. Still no luck? A faulty thermostat or wiring issue may be to blame, so an electrician should take a look.<\/li>\n\n\n\n<li><strong>Thermostat not set up correctly (E1 &amp; E2 errors): <\/strong>Thermostat displays showing an <a href=\"https:\/\/support.tado.com\/en\/articles\/3482479-my-smart-radiator-thermostat-displays-an-e1-e2-or-e4-error-how-can-i-fix-this\" target=\"_blank\" rel=\"noopener\">E1 or E2 error<\/a> often just need resetting. You\u2019ll find the reset instructions in the manual. These kinds of problems with underfloor heating are common and easy to fix if caught early.<br><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-4-problems-with-other-underfloor-heating-parts\">4. Problems With Other Underfloor Heating Parts<\/h3>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Air bubble or airlock in the UFH loop: <\/strong>Air can get trapped in the pipework, stopping water from circulating properly. To remove an airlock:<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Isolate all zones except the one that isn\u2019t heating<\/li>\n\n\n\n<li>Remove the actuator<\/li>\n\n\n\n<li>Attach a hosepipe to the flow valve and connect to a mains cold tap<\/li>\n\n\n\n<li>Connect a second hose to the drain valve and direct to waste<\/li>\n\n\n\n<li>Open both valves and flush the zone with water<\/li>\n<\/ul>\n\n\n\n<p>If unsure, a plumber can do this for you safely and quickly.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wiring issue: faulty connection or dry joint: <\/strong>Loose wires or dry solder joints can stop the actuator or thermostat from receiving power. This is one of the more technical underfloor heating problems, so it\u2019s best left to an electrician.<\/li>\n\n\n\n<li><strong>Flow gauges not opened properly on the manifold<\/strong>: Sometimes, the issue is as simple as a valve not being fully open. Check the flow gauges on your manifold and refer to your manual to adjust them correctly. Each system is slightly different.<br><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-5-multiple-zones-or-entire-system-is-not-heating-up\">5. Multiple Zones or Entire System Is Not Heating Up<\/h3>\n\n\n\n<ol start=\"5\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>If more than one zone\u2014or even the whole system\u2014isn\u2019t heating up, the issue is likely larger than just one faulty part. These underfloor heating problems are usually tied to the system\u2019s power supply, circulation, or control settings. While some things can be checked at home, most of these issues may still need professional attention.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Circulation Pump Failure<\/strong>: The circulation pump moves warm water through the underfloor heating system. If it fails, no heat will reach any zone. This is typically an electrical issue and should be inspected by a qualified electrician.<\/li>\n\n\n\n<li><strong>Pump Relay on Wiring Board<\/strong>s: If the pump relay is stuck or faulty, it won\u2019t send the correct signal to start or stop the pump. This is another one of those problems with underfloor heating where an electrician should be called out to test and replace the faulty part.<\/li>\n\n\n\n<li><strong>Isolation Valves Closed on the Manifold<\/strong>: Sometimes, the issue is mechanical rather than electrical. The isolation valves on the manifold may have been accidentally left closed. These levers should sit in line with the pipework when open. If they\u2019re positioned at 90 degrees, the flow of water is blocked. This is a simple fix and can be done without tools.<\/li>\n\n\n\n<li><strong>Blending Valve Pin Stuck: <\/strong>Blending valves regulate water temperature. If the pin underneath the thermostatic valve head is stuck, the valve won\u2019t function correctly. Remove the white plastic head and check the pin. Use silicone spray or long-nose pliers to gently free it if stuck, then replace the valve head.<\/li>\n\n\n\n<li><strong>Boiler Not Firing (No Signal)<\/strong>: If the boiler isn\u2019t firing at all, the system won\u2019t produce heat. This could be due to a wiring issue or failed relay between the boiler and control system. A qualified electrician can test the wiring board and boiler signal to confirm the fault.<\/li>\n\n\n\n<li><strong>No Power to the Wiring Boards: <\/strong>If the main power supply to the wiring boards is off, the entire system will shut down. Check your isolator switch\u2014if it\u2019s turned off or tripped, turn it back on. If it keeps tripping or there\u2019s still no power, an electrician will need to investigate.<br><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6-6-all-zones-are-not-heating\">6. All Zones Are Not Heating Up<\/h3>\n\n\n\n<ol start=\"6\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>When no zones are producing heat, it&#8217;s usually a sign of a bigger issue affecting the whole system. These types of underfloor heating problems could relate to the boiler, the manifold, or the system&#8217;s power supply. While there are a few basic checks you can do yourself, most problems with underfloor heating at this scale should be handled by a heating engineer.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check Boiler Pressure and Operation<\/strong>: The first thing to check is whether the boiler is running at a proper pressure. If the pressure is too low, it often means there\u2019s a leak somewhere in the system. A boiler that isn&#8217;t firing up at all could indicate a lack of signal from the wiring board or faulty connections.&nbsp;<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Confirm the boiler pressure gauge shows a normal reading (usually between 1 and 1.5 bar when cold).<\/li>\n\n\n\n<li>If the boiler isn\u2019t firing, check the wiring and relays\u2014or call an electrician to test them properly.<\/li>\n\n\n\n<li>If the opposite effect is occurring, check our guide on <a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/boiler-pressure-too-high\/\">boiler pressure being too high<\/a>.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check the Power Supply: <\/strong>Make sure the main isolating switch is turned on. If the switch has tripped or is off, none of the wiring boards will receive power, and the entire heating system will stop working. Turn the switch back on and see if the system restarts.<\/li>\n\n\n\n<li><strong>Listen for the Circulation Pump<\/strong>: A quiet or silent pump could suggest a mechanical failure or loss of power. A working pump usually gives off a low whirring sound. If you can\u2019t hear anything, it may be faulty, and an electrician or plumber will need to inspect it.<\/li>\n\n\n\n<li><strong>Inspect the Manifold<\/strong>: If the issue isn\u2019t the boiler or the power supply, the fault may lie with a manifold component\u2014such as a stuck mixing valve, faulty actuator, or internal blockage. These are difficult to test without the right tools, so a professional should handle the inspection.<br><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"7-7-rise-in-underfloor-heating-system-pressure-pressure-testing\">7. Rise in Underfloor Heating System Pressure (Pressure Testing)<\/h3>\n\n\n\n<ol start=\"7\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>Some water underfloor heating problems are first spotted during pressure testing. If the system pressure is too high, there may be several possible causes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Filling loop left on or letting by<\/strong>: Ensure both valves at the ends of the filling loop are fully closed and disconnect the loop.<\/li>\n\n\n\n<li><strong>Restriction in the pipework<\/strong>: Pressure that changes with pump speed often points to airlocks or partial blockages.<\/li>\n\n\n\n<li><strong>Pump location<\/strong>: If the pump is installed close to a valve, expect a temporary pressure change when it starts.<br><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"8-8-expansion-vessel-issues\">8. Expansion Vessel Issues<\/h3>\n\n\n\n<ol start=\"8\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>A common cause of rising pressure is a failed diaphragm inside the expansion vessel.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Press the Schrader valve underneath the vessel\u2014if water escapes, the diaphragm has ruptured and the vessel needs replacing.<\/li>\n\n\n\n<li>If no water escapes but pressure keeps rising, it could be low on air. Use a foot pump to increase pressure to around 2 bar, then refill the water side to normal levels.<br><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"9-9-pressure-drop-on-system-boiler-locking-out\">9. Pressure Drop on System (Boiler Locking Out)<\/h3>\n\n\n\n<ol start=\"9\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>Not all underfloor heating problems involve rising pressure\u2014some systems lose pressure instead. A sudden pressure drop often causes the boiler to lock out. To find the cause:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Look for leaks around visible pipework, joints, the cylinder, and all valves.<\/li>\n\n\n\n<li>Re-pressurise the system, then isolate each side of the manifold one at a time.<\/li>\n\n\n\n<li>Watch which side drops in pressure\u2014this shows you where the leak is happening.<\/li>\n\n\n\n<li>Don\u2019t forget to check the pressure relief valve, boiler blow-off valve, and expansion vessel.<\/li>\n<\/ul>\n\n\n\n<p>Leaks and pressure-related problems with underfloor heating can seem difficult to trace, but isolating zones and watching pressure behaviour can help narrow it down. In most cases, calling in a qualified plumber is the safest route.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"10-6-electric-underfloor-heating-problems\">6 Electric Underfloor Heating Problems<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><a ref=\"magnificPopup\" href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-content\/uploads\/2025\/02\/problems-with-underfloor-heating-electric.jpg\"><img decoding=\"async\" width=\"720\" height=\"480\" src=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-content\/uploads\/2025\/02\/problems-with-underfloor-heating-electric.jpg\" alt=\"problems with underfloor heating electric\" class=\"wp-image-3603\" srcset=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-content\/uploads\/2025\/02\/problems-with-underfloor-heating-electric.jpg 720w, https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-content\/uploads\/2025\/02\/problems-with-underfloor-heating-electric-300x200.jpg 300w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/a><\/figure>\n\n\n\n<p><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/electric-underfloor-heating\">Electric underfloor heating<\/a> systems are often chosen due to being easier to install and have low maintenance needs. However, that doesn\u2019t mean they\u2019re completely free from issues.&nbsp;<\/p>\n\n\n\n<p>The good news is that many electric underfloor heating problems are easy to spot\u2014and in some cases, easy to fix. Below are the most common problems with underfloor heating in electric systems, how to identify them, and what to do next.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"11-10-electric-underfloor-heating-won%E2%80%99t-turn-off-or-isn%E2%80%99t-warming-up\">10. Electric Underfloor Heating Won\u2019t Turn Off or Isn\u2019t Warming Up<\/h3>\n\n\n\n<ol start=\"10\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>One of the most reported common underfloor heating problems is when the system either doesn\u2019t heat up or won\u2019t switch off. In most cases, this comes down to a thermostat issue or faulty wiring.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Check the thermostat settings<\/strong>: Ensure it\u2019s programmed correctly and isn\u2019t stuck in a mode that overrides scheduled heating.<\/li>\n\n\n\n<li><strong>Test the floor sensor<\/strong>: This small probe communicates with the thermostat and regulates temperature. If it\u2019s faulty or disconnected, the system won\u2019t respond properly.<\/li>\n\n\n\n<li><strong>Inspect wiring connections<\/strong>: Loose or broken wiring can interrupt communication between the thermostat and the heating cable. This should be checked by a qualified electrician.<\/li>\n<\/ul>\n\n\n\n<p>If these steps don\u2019t work, it\u2019s best to call an electrician to carry out further testing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"12-11-floor-isn%E2%80%99t-getting-warm-enough\">11. Floor Isn\u2019t Getting Warm Enough<\/h3>\n\n\n\n<ol start=\"11\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>If your electric underfloor heating feels lukewarm\u2014or not warm at all\u2014there are a few common causes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Incorrect thermostat settings<\/strong>: Increase the temperature slightly or check for restrictions like time schedules or energy-saving modes.<\/li>\n\n\n\n<li><strong>Low system power output<\/strong>: Some systems aren\u2019t powerful enough to heat larger areas, especially if they weren\u2019t sized correctly during installation.<\/li>\n\n\n\n<li><strong>Poor insulation<\/strong>: Heat can escape downwards if your subfloor or room isn\u2019t properly insulated. This is a common reason why some floors never seem to reach the desired temperature.<br><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"13-12-damaged-or-cut-heating-cable\">12. Damaged or Cut Heating Cable<\/h3>\n\n\n\n<ol start=\"12\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>If you\u2019ve accidentally damaged or cut the heating cable during floor installation or renovation, don\u2019t panic. Using the wrong fix could lead to further damage or safety risks. If in doubt, give us a call and we\u2019ll help guide you.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"14-13-unexpected-running-costs\">13. Unexpected Running Costs<\/h3>\n\n\n\n<ol start=\"13\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>Electric systems typically cost more to run than warm water systems, especially over larger areas. If your energy bill is higher than expected:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Review thermostat programming<\/strong>: Lower the set temperature, adjust schedules, or reduce how long the heating runs each day.<\/li>\n\n\n\n<li><strong>Check insulation<\/strong>: Poor insulation will force your system to work harder to maintain heat.<\/li>\n\n\n\n<li><strong>Consider room size<\/strong>: Electric underfloor heating is best suited to smaller spaces like bathrooms or en-suites.<\/li>\n<\/ul>\n\n\n\n<p>These factors often lead people to think there\u2019s a fault, when it\u2019s more to do with setup and expectations.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"15-14-mistakes-during-installation\">14. Mistakes During Installation<\/h3>\n\n\n\n<ol start=\"14\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>Electric systems are usually straightforward to install, but mistakes do happen. Common installation issues include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Loose or badly positioned temperature probes<\/li>\n\n\n\n<li>Incorrect spacing of heating cables<\/li>\n\n\n\n<li>Improper insulation under the matting<\/li>\n<\/ul>\n\n\n\n<p>If you suspect something wasn\u2019t installed properly, it\u2019s worth getting a professional to inspect the system\u2014especially before any floor coverings are laid.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"16-15-airlocks-and-pressure-problems-shared-with-wet-systems\">15. Airlocks and Pressure Problems (Shared with Wet Systems)<\/h3>\n\n\n\n<ol start=\"15\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<p>While electric underfloor systems don\u2019t suffer from water-based airlocks like warm water systems, some problems with underfloor heating are still related to pressure and insulation:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"17-are-underfloor-heating-systems-supposed-to-be-airtight\">Are underfloor heating systems supposed to be airtight?<\/h3>\n\n\n\n<p>Slight pressure drops over time are normal in any heating system, especially as components age. But if you&#8217;re seeing rapid or repeated drops in pressure, this could suggest a leak or trapped air.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Recurring airlock problems<\/strong>: These are more common in water underfloor systems, but if your system is losing pressure and performance, it may be worth asking your heating engineer to run an air escape cycle at your boiler\u2019s next service.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"18-why-is-my-floor-not-reaching-the-desired-temperature\">Why is my floor not reaching the desired temperature?<\/h3>\n\n\n\n<p>If everything appears to be working, but the floor still feels cooler than expected, try the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check the flow temperature on the boiler and manifold. A large difference could point to a faulty temperature sensor.<\/li>\n\n\n\n<li>Test the boiler pressure. Low or unstable pressure might be due to air, sediment build-up, or a small leak.<\/li>\n\n\n\n<li>Inspect the pipes between the boiler and manifold. Leaks in this area can reduce efficiency and cause pressure drops.<\/li>\n<\/ul>\n\n\n\n<p>In conclusion, it is clear that underfloor heating problems can happen from time to time, whether you\u2019re using a wet or electric based system. Thankfully, most issues\u2014like cold spots, faulty thermostats, or pressure drops\u2014can be identified with simple checks and fixed quickly; it is rarely down to the manufacturer\u2019s fault. Hopefully, this guide has covered the most common problems with underfloor heating that you may likely experience at some point with your new underfloor heating system, and what steps to take next. If in doubt, or the problem continues, it\u2019s always worth getting a qualified professional to take a closer look.<\/p>\n\n\n\n<p><strong>Further reading:<\/strong><\/p>\n\n\n\n<p>Check out our other guides regarding underfloor heating maintenance &#8211;&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/how-to-bleed-underfloor-heating\/\">How to bleed underfloor heating<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/underfloor-heating-wiring\/\">How to wire underfloor heating<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/underfloor-heating-manifolds-explained\/\">Underfloor heating manifold explained<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/underfloor-heating-leak\/\">Signs of underfloor heating leak<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/repair-underfloor-heating\/\">Repair underfloor heating<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"19-faqs\">FAQs<\/h3>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list \">\n<div id=\"faq-question-1744635636356\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>How do I reset my underfloor heating system?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>To reset your underfloor heating, press and hold the <em>Mode <\/em>and<em> i<\/em> buttons on your thermostat for around 10 seconds. After a few seconds, the system will switch to test mode, which triggers a reset. Always check your user manual, as the process may vary slightly between models.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1744635855850\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>Does underfloor heating often stop working?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Most underfloor heating problems are rare, especially when the system has been properly installed and maintained. If something does go wrong, it\u2019s often down to a thermostat setting, low battery, or minor wiring issue\u2014all of which are usually quick to fix.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1744635865652\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>Which type of flooring works best with underfloor heating?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Ceramic and stone tiles are ideal for underfloor heating because they transfer heat quickly and evenly. Other options like laminate or engineered wood can work too, but always check they\u2019re rated for use with underfloor systems. Discover the <a href=\"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/best-flooring-for-underfloor-heating\/\">best flooring for underfloor heating<\/a>.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"20-sources\">Sources<\/h3>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Tado. (2024) My Smart Radiator Thermostat displays an E1, E2 or E4 error. How can I fix this? [online] Available at: <a href=\"https:\/\/support.tado.com\/en\/articles\/3482479-my-smart-radiator-thermostat-displays-an-e1-e2-or-e4-error-how-can-i-fix-this\" target=\"_blank\" rel=\"noopener\">https:\/\/support.tado.com\/en\/articles\/3482479-my-smart-radiator-thermostat-displays-an-e1-e2-or-e4-error-how-can-i-fix-this<\/a> [accessed 14\/04\/2025]\n","protected":false},"excerpt":{"rendered":"<p>Underfloor heating is great\u2014until it stops working properly. What are the most common underfloor heating problems, and how can they be easily resolved? If you\u2019re dealing with underfloor heating problems, whether it\u2019s a cold patch on the floor or a system that won\u2019t switch off, you\u2019re not alone. Like any other central heating system, underfloor&#8230;<\/p>\n","protected":false},"author":6,"featured_media":3604,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[8,246,9],"tags":[368,369],"class_list":["post-3440","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-heating","category-knowledge-hub","category-maintenance","tag-common-underfloor-heating-problems","tag-problems-with-underfloor-heating"],"acf":[],"featured_image_src":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-content\/uploads\/2025\/02\/problems-with-underfloor-heating-ftd.jpg","author_info":{"display_name":"Jack Poyser","author_link":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/author\/jack-poyser\/"},"_links":{"self":[{"href":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-json\/wp\/v2\/posts\/3440","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=3440"}],"version-history":[{"count":0,"href":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-json\/wp\/v2\/posts\/3440\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-json\/wp\/v2\/media\/3604"}],"wp:attachment":[{"href":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=3440"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=3440"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.underfloorheatingtradesupplies.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=3440"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}