If you have such a boiler, then what you're seeing is intended behaviour, and will be described in the manual. boiler still runs even when thermostat is off Update to my post is as is : Today I installed a new aquastat L4080B-1253 and the problem persists The only difference is that when the boiler got to the low setting of the aquastat it shut down. If not, check the fused spur and make sure the power is switch to the boiler is turned on. If your boiler timer controls your hot water, this may be the cause of the problem. Only resolution is to switch off at power socket. • by John Carmichael | Jan 29, 2016 | boiler Issues | 11 comments. Up till now my heating has been working fine, on/off with timer, room-stat and tank-stat etc. All boilers come with an electronic timer, which enables you to programme your boiler to turn on at specific times in the day. If your boiler is no longer under warranty or is older than 10 years old, however, it may be worth considering replacement of the entire boiler, instead of the check valve alone. The burner then turned off but the boiler display is 'c' which should be 'o' when everything is off. Check the needle reading on your ever trusty boiler pressure gauge – if it’s reading over 1.5 bar (when the boiler is switched off), your boiler pressure is too high. Original title: Annoying egg timer! When I put the cover back on whilst it is now running, after a few minutes - Answered by a verified Plumber. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. It is called short cycling and is likely to make your heating bills more expensive and, in the long term, will cause damage to the boiler. Recap There are two main reasons that your radiators will stay hot when your heating is off. Otherwise switch the boiler off to stop it reheating. Run through these simple diagnostics before calling an engineer. Lack of water flow If the boiler keeps shutting off, it could be due to closed valves, air caught in the system or a broken pump. The boiler is kicking in and out because it's being controlled by the 'stat in the hot water cylinder. This could also be caused by frost protection: many boilers/thermostats will attempt to warm up the system if it's at risk of freezing (as frozen pipes often cause leaks), even if it's switched off at the timer or thermostat. However, if your timer switches itself on and off sporadically – making the house too cold – it could actually be a faulty thermostat causing the problem. There are, however, a number of potential alternative reasons. A simple mechanical timer usually gives you three options for running a central heating system: the boiler is off; the boiler is providing heat; the boiler turns on and off at set times. Your room thermostat settingstelling the boiler not to come on 5. I then turned it down again but that did nothing. It results in the radiators coming on in the house and our baby's bedroom getting far too hot! In the case of an old mechanical clock, it may have not adjusted when you changed the clocks back or forward according to the season. It’s like it’s not receiving the message to come on. I have turned off the c/h at the panel and the boiler was firing for about 5mins. When the timer is set to switches of it does for maybe a min or two then heating comes on again Or usually when you turn on hot water tap cause it to switch it s self back on to heating Any idea thanks Only working sporadically for the past week, could this be an electrical fault. If your boiler keeps tripping the electricity, it’s always best to enlist the help of a professional heating engineer. Required fields are marked *, With this in mind, I thought I’d write this blog post so you can determine. I don’t know whether to call an electrician or a CH professional. 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