this is actually a failed control knob (thermostat)
the contacts inside have become intermittent as will happen with age ;-)
I will switch us to Q & A it may work better,
Thankyou - I will try to get a replacement thermostat control knob and replace it. . .......i will advise in a few days time it it fixes the problem.
Hi Michael - have sourced and fitted a new thermostat control (potentiometer they call it) it came with a wiring harness so just had to fit it and connect the 2 plug connectors. All seemed to work OK however this morning when the system is cold the heating did not come on untill I turned the the boiler thermostat knob to off (0 position ) the on again. .....the the boiler came to life! So the new part has not made any difference.
Just to clarify - changing the control switch has made no difference the boiler still fails to start unless I turn the control knob to off then back on again......any other suggestions?
Thanks in anticipation,
Hi - thanks for following this up. Probably best to advise you ths is not a bog standard set-up..........we live in a covverted bungalow, so there is no loft space to house a header tank so the hot water tank has a header tank as part of it. The system works such that the water in the hot water tank is shared with the radiators and we get hot water from the mains supply passing through the tank on it's Way to the hot taps. Happy to test the motorised valve if you advise how. I think the fault lies with the boiler though cos I was up this morning when the heating comes on. The radiators get warm as the water in the hot water tank gets circulated round the system which tells me that the motorised valve must be working.......the boiler should fire up at this stage to bring the tank and radiator water up to working temp. However it fails to start - normally I switch the boiler temp knob to off then on again and it then fires up but nothing happened today. I left it for 5 mins or so and tried again this time it's worked ! My guess is there must be some sort of sensor on the boiler which is failing to trigger till the circulating water from the hot tank warmed the boiler enough to make it work. Hope this makes sense!
Hi . just going to look up your boiler manual will be a few mins , thanks. Mybthinkingvis it has to be the boiler , as it seems to reset when you turn the boiler to off on the boiler stat. This can only be resetting the overheat stat. Why the overheat stat could be operating could be the permanent pilot is heating the boiler overnight ( maybe boiler a little blocked \ sludged) and the heat isn't dissipating .
The boiler was Stone cold this morning - which is the condition from which it fails to start. Once the
That sounds like a good idea - I'll be otherwise occupied for most of the morning so will come back to this as soon as I can - thanks so far. - Alan .
Hi Toby ,
I'd like to give you an excellent rating however when I try that, the system wants me to pay another £21 which I am not prepared to do.
Tried again this morning to give you an excellent rating however the system displays a popup box indicating that I have already rated the expert - Michael who started this off and asked me to rate him, promised to stick with it till it was resolved but I could not get anything more from him. ....since I was not not happy and obviously wanted to resolve this took the 'not satisfied with your Expert' option. You took it up.....but I suppose Michael has had the credit for this! Don't know how to rectify this unless you can tell me how to redirect the credit to you .
Very kind thankyou. . ......all the best to you and Yours this Christmas