Sounds like a fault somewhere - save time and effort and get it fixed by a engineer. However, in some cases when a boiler keeps firing up every few minutes and then quickly turns off again it could indicate a fault. A timer or programmer allows you to control when your heating and hot water comes on and when it goes off. It just seems that if the temperature falls below what I want it to be when the timer is on, the heating will come on even if its timed to be off… Can anyone tell me why my central heating comes on by itself: the radiators get hot and stay hot for around 1-3 minutes then the system turns back off again. 3 posts • Page 1 of 1. by Ian Graham » Mon Jan 19, 2009 5:44 pm . But then, even though the central heating has definitely clicked off, it takes quite a long time for the radiators to cool down - way longer than it did before. I'm not complaining that the house is warm, but if … Now we've blown the thermal fuse again, 2 days ago, and I've had someone come and clean the vent in the wall out, which had a good bit of lint in it. This issue can be equally confusing and inconvenient as it could cause your household to become too warm, wasting energy and … 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. At first I put it down to the timer on the heating, but I have now set all the timer temperatures to a temperature that does not require the … It is called short cycling and is likely to make your heating bills more expensive and, in … A boiler timer will turn your heating on at a certain time each day, whereas a programmer will allow you to turn your central heating on at different times on different days. It may seem odd to want to stop your boiler from doing what it was designed to do. I set the wall controls so that the heating would only come on if it was below 22 degrees (which it hasn't been yet) but noticed that the boiler is … We have a two level thermostat and that is how ours is designed to work. I have a Megaflow system with potterton profile boiler and Honeywell 9400 programmer.Up to now it was working fine .After draining the system to add fresh inhibitor , the central heating now only works when I turn on the hot water switch.The system was plumbed with separate motorised valve for hot water and separate for central heating,If I switch on the central heating … This can happen any time throughout the day and night, and you can hear the system kicking in. Timeswitches and programmers are both time … Mechanical timers activate boiler controls at the end of a specified time. Heating will come on although contol shows heating is off. However, this is a dilemma faced by some homeowners as they seek to find a way of getting their boiler to turn off. We will be away for a while shortly and were advised to turn off the mains water supply. Hi there, First time posting so hope can be of assistance. How do I Boost my heating and hot water on the Hive Active Heating 2 thermostat? One of the radiators even gets warm when hot water on and radiator thermstat is turned off (tested with heat on and hot water off--radiator stays cold, so valves are working and hot water is somehow getting into this radiator). Wow what a superb message board , right i believe i have the same problem has cez-raf yesterday i knocked the heating off on the timer so i could just have hot water but my central heating stays on !!! The only thing is the timer wouldn’t cause the thermo fuse to blow out twice. And I witnessed the fault when I went to look initially, the heating and hot water where both on, the hot water is always set to off, and the heating wasn't within its set demand time. 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