Greenstar 37cdi combi not coming on even though thermostat is calling for heat. It is operating normally for hot water. It's due to be serviced in a week but would like heating on now. Any suggestions for a self fix? I've attached photos showing the thermostat calling for heat and the green light is on the receiver. The heating light is not on the boiler though. The thermostat and receiver model is Altech ALTHC014.
Greenstar 37cdi combi not communicating with thermostat?
- Thread starter markjg123
- Start date
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D
Deleted member 267285
Could be the diverter motor is stuck, try resetting the boiler.
D
Deleted member 267285
Could be a malfunction of the room thermostat, is there a manual override? If not you could join the 2 signal wires together. Make sure it’s nothing as simple as batteries to the wireless thermostat.
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D
Deleted member 267285
Safely electrically isolate the system, remove the Altech receiver cover and join the ones that aren’t L and N, probably com and NO.
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