I have problem with my heating is start self , first I think is from thermostat and I replaced but is continuing for that I check mid position valve but is controlled from thermostat that is mean is working but still can't understand why sometimes is starting self and can't be stop if you not cut Power on all sistem .Any advice will be helpful Thanks
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Is there a frost thermostat fitted? A frost thermostat will override any other controls.
Most likely the middle position valve is letting by to the heating path.
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D
Doggit
There is a frost stat inside the boiler as well as the thermostat on the wall. If the boiler gets too cold, this will start the boiler working. I have a similar problem on my boiler; it starts itself, goes for about 20 seconds, and then switches itself off.
When your boiler starts, how long does it run for before you turn the power off.
When your boiler starts, how long does it run for before you turn the power off.
What is the make and model of the boiler that you have ?
Unlikely by programmer, likely by the valve.
D
Doggit
Far more likely to be the PCB in the boiler making it come on by itself, but if you turn the hot water off, and the radiators stay hot, then either the pogrammer has been wired wrongly, ir the valve is at fault.
very unlikely to be the programmer more likely to be zoning control valve
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