Hi, I am a plumber with limited experience with heating, I was called to a house yesterday to investigate a heating problem. The house is approx 35 years old with original system. It has a backboiler, with a pump fitted (fairly recently) on the flow to the boiler. There is an old timer in the airing cupboard which the lady has set on/off twice a day for a couple of hours. All the rads have trv's, there is no room stat, the heating temp is controlled by the boiler thermostat (under gas fire).
This system has worked fine since the year dot and she is happy controlling it this way, however all this past winter when the heating is on she has no control over the temperature, it's either very hot or off, she says she had someone come to look at the problem before xmas and they were baffled but said the thermostat on boiler was ok (Don't know how they checked this)
any ideas?
This system has worked fine since the year dot and she is happy controlling it this way, however all this past winter when the heating is on she has no control over the temperature, it's either very hot or off, she says she had someone come to look at the problem before xmas and they were baffled but said the thermostat on boiler was ok (Don't know how they checked this)
any ideas?
