I had my basic gas heating system reworked professionally and a new boiler (Glowworm Ultimate ) and an electronic programmer/ timer installed. The system functions after a fashion but I have noticed that while the central heating work as expected, the hot water does not.
The heating operates according to the programmer, responds to the room thermostat and fires up the boiler and pump, which turn off once the thermostat setting is reached, with virtually no pump over-run. The hot water, however, when operating on its own will respond to the tank thermostat, firing up boiler and pump, but once the boiler has finished burning the pump runs on - not just for a few minutes, but for up to an hour. Although it does vary as to how long , it does eventually turn off. It has on occasions also some on outside its programmed hours when the controller shows water as OFF!
I contacted the programmer manufacturers who said the problem was with the boiler as it controls the pump in order to protect itself from over-heating. I cannot see that it could be the over-run thermostat as it appears to operate correctly when the heating alone is on.
My suspicion is that something is incorrectly wired but no-one seems interested in taking on the problem - any ideas welcome!
The heating operates according to the programmer, responds to the room thermostat and fires up the boiler and pump, which turn off once the thermostat setting is reached, with virtually no pump over-run. The hot water, however, when operating on its own will respond to the tank thermostat, firing up boiler and pump, but once the boiler has finished burning the pump runs on - not just for a few minutes, but for up to an hour. Although it does vary as to how long , it does eventually turn off. It has on occasions also some on outside its programmed hours when the controller shows water as OFF!
I contacted the programmer manufacturers who said the problem was with the boiler as it controls the pump in order to protect itself from over-heating. I cannot see that it could be the over-run thermostat as it appears to operate correctly when the heating alone is on.
My suspicion is that something is incorrectly wired but no-one seems interested in taking on the problem - any ideas welcome!