About 18 months ago we had a new central heating system installed useing a Potterton Performa 24 Combi Boiler. This worked very well for the heating and hotwater. Quite recently a very odd fault developed. When the Boiler was switched to hot water only the central heating continued to operate. I am not sure if a valve operates to divert the system to hot water only and this is stuck, or it is something electrical. I have tried turning the boiler off and letting it cool for a couple of hours, but when it is switched on the same thing happens.
- posted
20 years ago