{"id":35030,"date":"2026-08-16T19:34:23","date_gmt":"2026-08-16T18:34:23","guid":{"rendered":"https:\/\/www.plusheat.co.uk\/?p=35030"},"modified":"2026-08-16T19:34:23","modified_gmt":"2026-08-16T18:34:23","slug":"worcester-boiler-c6-fault-code-causes-fixes","status":"publish","type":"post","link":"https:\/\/www.plusheat.co.uk\/__prelive\/boiler-advice\/worcester-boiler-c6-fault-code-causes-fixes\/","title":{"rendered":"Worcester Boiler C6 Fault Code: Causes &#038; Fixes"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">The Worcester boiler C6 fault code means your boiler has detected a problem with the fan speed. The fan is either running too fast or too slow, so the boiler shuts down as a safety measure to stop harmful gases building up.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Common causes include a blocked or restricted flue, a worn or failing fan motor, loose or damaged wiring, a clogged venturi inside the fan assembly, or an issue with the air pressure switch or control board. This guide explains everything UK homeowners and landlords need to know so you can understand the problem and get your heating and hot water back safely.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A <\/span><a href=\"https:\/\/www.plusheat.co.uk\/boiler-cover\/\"><span style=\"font-weight: 400;\">boiler cover plan<\/span><\/a><span style=\"font-weight: 400;\"> can make a real difference when faults like this appear. Instead of facing unexpected call-out and repair bills, you get protection that covers the cost of a Gas Safe engineer and parts when something goes wrong. Many homeowners find it saves money in the long run, especially if a more serious issue develops later.<\/span><\/p>\n<h2><b>What Does The Worcester Boiler C6 Fault Code Mean?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The Worcester boiler C6 fault code points to a fan speed fault on Worcester Bosch boilers. Your boiler constantly checks that the fan is spinning at the correct speed so it can pull in air for safe burning and push waste gases out through the flue. When the speed falls outside the safe range (sometimes shown with extra numbers like 215 for too low or 216 for too high), the boiler locks out and displays C6.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This is a safety feature. Without the right airflow the boiler cannot run safely, so it stops heating and hot water until the problem is sorted. You might hear unusual fan noise or notice the boiler tries to start then shuts down. A simple reset sometimes clears a one-off glitch, but if the code returns you will need a Gas Safe registered engineer.<\/span><\/p>\n<h2><b>What Causes The Worcester Boiler C6 Fault Code?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The Worcester boiler C6 fault code is usually triggered by problems that stop the fan working at the right speed. The main causes are a blocked flue, a failing fan, wiring issues, a clogged venturi, or faults with related sensors and the control board. Here is a closer look at each one.<\/span><\/p>\n<h3><b>Blocked Or Restricted Flue<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">A blocked or restricted flue is one of the most common reasons for the Worcester boiler C6 fault code. Leaves, snow, ice, birds\u2019 nests, wasp nests or even a football can block the external flue terminal. When the flue is restricted the fan cannot move air properly, so the boiler detects the wrong speed and locks out. This happens more often in autumn and winter or after stormy weather.<\/span><\/p>\n<h4><b>How To Fix<\/b><\/h4>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">From outside, look carefully at the flue terminal on the wall or roof. Check for obvious debris, nests or ice.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Clear any visible leaves or snow if it is safe and easy to reach. Never put your hand inside the flue.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reset the boiler by pressing and holding the reset button (often marked with a flame or spanner symbol) for a few seconds.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the code returns or you cannot see the problem clearly, turn the boiler off and call a Gas Safe engineer. They will inspect the full flue path and clear any internal blockages safely.<\/span><\/li>\n<\/ol>\n<h3><b>Failing Or Worn Fan Motor<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Over time the fan motor can wear out. Bearings become noisy or seize, or the motor simply cannot reach the correct speed. This is especially common on Greenstar models that are eight to twelve years old. The fan may spin slowly, make unusual sounds, or fail to respond properly, triggering the C6 code.<\/span><\/p>\n<h4><b>How To Fix<\/b><\/h4>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Listen carefully when the boiler tries to start. Unusual grinding or whirring can point to a failing fan.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Try a reset once. If the code clears and the boiler runs normally, monitor it closely.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Do not keep resetting if the fault returns. Switch the boiler off at the isolator switch.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Call a Gas Safe registered engineer. They will test the fan speed, check for free movement, and replace the fan assembly if needed. This is not a DIY job because it involves the combustion system.<\/span><\/li>\n<\/ol>\n<h3><b>Loose Or Damaged Wiring<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Wiring between the fan and the control board can work loose or become damaged by heat, vibration or moisture. When the signal from the fan is interrupted or incorrect, the boiler reads it as a speed fault and shows the Worcester boiler C6 fault code.<\/span><\/p>\n<h4><b>How To Fix<\/b><\/h4>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Do not open the boiler casing yourself. Only a Gas Safe engineer is allowed to work on the internal electrics of a gas boiler.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Note any recent building work, power cuts or water leaks near the boiler that might have affected the wiring.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reset the boiler once to rule out a temporary glitch.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Book a Gas Safe engineer. They will check every connection, test continuity, repair or replace damaged cables, and confirm the fan signal is correct.<\/span><\/li>\n<\/ol>\n<h3><b>Clogged Venturi Or Debris In The Fan Assembly<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The venturi is a small plastic part inside the fan assembly that helps measure airflow. Dust, spider webs or debris can block it. The fan may still spin, but it cannot move enough air, so the boiler detects the wrong speed and displays C6.<\/span><\/p>\n<h4><b>How To Fix<\/b><\/h4>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">There is nothing safe for a homeowner to do inside the fan assembly.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reset the boiler once. If the code clears, keep an eye on performance.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the fault returns, switch the boiler off.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Call a Gas Safe engineer. They will clean or replace the venturi and check the whole fan assembly for debris or wear.<\/span><\/li>\n<\/ol>\n<h3><b>Air Pressure Switch Or Control Board Issues<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Sometimes the air pressure switch (which confirms correct airflow) or the main control board develops a fault. The fan itself may be fine, but the boiler receives the wrong information and locks out on C6. Moisture or age can cause these problems.<\/span><\/p>\n<h4><b>How To Fix<\/b><\/h4>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Reset the boiler once and see if the code clears.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Check that the external flue looks clear and that the condensate pipe is not frozen or blocked (a secondary issue that can sometimes affect airflow readings).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the fault persists, turn the boiler off.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Arrange for a Gas Safe engineer. They will test the air pressure switch, check signals to the control board, and replace any faulty parts.<\/span><\/li>\n<\/ol>\n<h2><b>How To Prevent The Worcester Boiler C6 Fault Code<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Preventing the Worcester boiler C6 fault code is largely about keeping the flue clear and the boiler well maintained. Regular care reduces the chance of fan speed problems appearing at the worst moment.<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Book an <\/span><a href=\"https:\/\/www.plusheat.co.uk\/boiler-service\/\"><span style=\"font-weight: 400;\">annual boiler service<\/span><\/a><span style=\"font-weight: 400;\"> with a Gas Safe engineer. They check the fan, flue, sensors and overall condition before small issues become breakdowns.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Keep the external flue terminal clear of leaves, snow, ice and debris. Check it after storms or in autumn.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Make sure nothing is stored against the boiler or blocking its air vents.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Insulate the condensate pipe if it runs outside so it is less likely to freeze and create secondary pressure problems.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Address any unusual noises from the boiler early rather than waiting for a lockout.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Consider a boiler cover plan that includes an annual service. Regular professional checks catch wear on the fan and related parts before they cause a C6 fault.<\/span><\/li>\n<\/ol>\n<h2><b>Protect Your Boiler With A PlusHeat Cover Plan<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Unexpected faults like the Worcester boiler C6 fault code can leave you without heating and facing a sizeable repair bill. A PlusHeat <\/span><a href=\"https:\/\/www.plusheat.co.uk\/boiler-cover\/\"><span style=\"font-weight: 400;\">boiler cover plan<\/span><\/a><span style=\"font-weight: 400;\"> gives you peace of mind. Our nationwide plans start from just \u00a34.99 a month for the first three months and include a free annual boiler service, parts and labour for covered repairs, and priority access to Gas Safe engineers.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Whether you are a homeowner or a landlord, cover means you are protected when problems arise and can often avoid the higher costs that come with more serious boiler issues later.\u00a0<\/span><\/p>\n<h2><b>FAQs<\/b><\/h2>\n<h3><b>Can a Worcester boiler C6 fault code clear itself after a power cut?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Sometimes a temporary power interruption can cause a one-off glitch that a single reset clears. If the code returns after the boiler has been running normally, the underlying fan or airflow issue is still present and needs professional attention.<\/span><\/p>\n<h3><b>Is the Worcester boiler C6 fault code dangerous?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The code itself is a safety lockout that stops the boiler from running when airflow is not correct. Leaving the fault unaddressed means you have no heating or hot water, and any attempt to force the boiler to run without fixing the cause is unsafe. Always treat it seriously and call a Gas Safe engineer if a reset does not solve it.<\/span><\/p>\n<h3><b>How much does it typically cost to fix a Worcester boiler C6 fault code?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Costs vary depending on the exact cause. A simple flue clear may be relatively inexpensive, while a full fan replacement or control board work will cost more. Labour and parts for a fan replacement often run into several hundred pounds, which is why many people prefer the predictability of a boiler cover plan.<\/span><\/p>\n<h3><b>Does the Worcester boiler C6 fault code affect both heating and hot water?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Yes. When the boiler locks out on C6 it stops producing both central heating and domestic hot water until the fault is cleared.<\/span><\/p>\n<h3><b>Can landlords leave a Worcester boiler C6 fault code for tenants to manage?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">No. Landlords have a legal duty to keep gas appliances safe and in working order. A persistent C6 fault means the boiler is not operating safely, so a Gas Safe engineer should be arranged promptly to restore heating and hot water for tenants.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Worcester boiler C6 fault code means your boiler has detected a problem with the fan speed. The fan is either running too fast or too slow, so the boiler shuts down as a safety measure to stop harmful gases building up.\u00a0 Common causes include a blocked or restricted flue, a worn or failing fan [&hellip;]<\/p>\n","protected":false},"author":2308,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[133],"tags":[],"class_list":["post-35030","post","type-post","status-publish","format-standard","hentry","category-boiler-advice"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Worcester Boiler C6 Fault Code: Causes &amp; Fixes<\/title>\n<meta name=\"description\" content=\"Worcester boiler C6 fault code signals a fan speed issue from blocked flue, failing fan or wiring faults. 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