Heating start by self

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

 

Is there a frost thermostat fitted? A frost thermostat will override any other controls.

 

I just checked online for frost thermostat and this is thermostat which I changed first when problem strat and this was in May but on hot day

 

Most likely the middle position valve is letting by to the heating path.

 

I replaced past year, and like I explained if I removed is work with thermostat and on fitted position is work but if is start you have to switch of power than everything is work normally

 

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.

 

What is the make and model of the boiler that you have ?

 

For example yesterday is start on lunch time and I stop control panel to work just on hot water without heating but 3pm radiators was hot and power off for 10sec helped than everything is work normally
Boiler is British gas 330+

 

Is it possible to be programmer ???

 

Unlikely by programmer, likely by the valve.

 

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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