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new here and apologies for my first post being a question about my own system.
Vaillant Thermocompact 620e
danfoss fp715 programmer
Danfoss hpa2 motorised control valves
Danfoss mechanical in room thermostat
The hot water works fine. The central heating comes on as programmed and then shuts down after about an hour. I believe the mechanical room thermostat is working properly and is calling for heat. If I go to the garage where the boiler is, and move the control lever on the central heating HPA2 to the manual position, the heating comes on and works normally. Of course I have to go and manually turn it off again at the end of the night otherwise the pump continues all night. I initially thought the HPA2 was faulty so replaced it like for like but it persists. The valve isnt binding or tight. I dont think its the fp715 either as it was replaced a few months ago, although I quite understand that occasionally things are faulty, right out of the box.
The house is about 12 years old and the boiler is original, regularly serviced.
Any thoughts as to the possible fault that is causing the CH to turn off after an hour or so, but still be functional by moving the hpa2 manually?
Am obliged!
Jim
Vaillant Thermocompact 620e
danfoss fp715 programmer
Danfoss hpa2 motorised control valves
Danfoss mechanical in room thermostat
The hot water works fine. The central heating comes on as programmed and then shuts down after about an hour. I believe the mechanical room thermostat is working properly and is calling for heat. If I go to the garage where the boiler is, and move the control lever on the central heating HPA2 to the manual position, the heating comes on and works normally. Of course I have to go and manually turn it off again at the end of the night otherwise the pump continues all night. I initially thought the HPA2 was faulty so replaced it like for like but it persists. The valve isnt binding or tight. I dont think its the fp715 either as it was replaced a few months ago, although I quite understand that occasionally things are faulty, right out of the box.
The house is about 12 years old and the boiler is original, regularly serviced.
Any thoughts as to the possible fault that is causing the CH to turn off after an hour or so, but still be functional by moving the hpa2 manually?
Am obliged!
Jim