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Hi - wonder if someone can give me an opinion. I am undecided whether I should pay thousands for a repair, or whether I'm just being scammed. In short - I have a solar-powered hot water system (hot solar fluid gets piped through the inside of an unvented water cylinder). When the water from the...

Hi. I know very little about central heating systems. My problem is the radiators are all stuck on full blast. I am using a Honeywell thermostat, I think it's a DT90E. The thermostat is set to 20. It shows room temp at the moment to be 26.5. There is no 'flame' symbol on the display, so...

Hi. Hoping someone can help - just moving into a new house and the thermostat seems to have packed up - I'm not sure. It is a Honeywell and I think it is the DT90E. On the digital display, where the temperature normally shows, it just says FAil. None of the buttons respond when...