Hi, hoping for some helpful advice. Sorry detailed story coming up...
My gas condenser boiler recently had its annual servicing by a Gas Safe engineer but a week later when the weather turned colder I noticed the central heating was not coming on. I checked the programming unit and found the heating only came on when the hot water is on. This is unusual as earlier this year when we needed the heating on, it worked without the need of the hot water switched on.
We called the engineer back who was puzzled by the problem and cited that he only checked and cleaned the boiler and didn't touch anything else. He suggested I change the programming unit which I did but the problem is still happening. I called the engineer a 3rd time only to be told he is on a long term job so can't visit again for a couple of weeks.
In the meantime, (luckily) we still get heating but only with hot water. Please can anyone suggest why the problem is occuring?