My Combi has developed a fault which is gradually getting worse, to the point now that it actulally rarely heats either water or radiator.
The fault. Id turn on either the CH or tap, and the boiler would heat the water... then stop, and the water would go cold, then it would heat the water again. this would repeat, the time between hot and cols water would be inconsistance. As an inexperienced Boiler person, it seems like all the pumps etc are working fine, the power stays constent, and it would appear that the boiler simply decides temperature has been reached and the heating mechanism shuts down, only moments later lighting up and heating again.
Sadly for me, i think its finally given up this morning and now its freezing :).
Is this a fairly common fault where a simple sensor needs changing? any assistance or opinions would be greatly appreciated.