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That’s what I was thinking aswell. Have moved the 5 to the 12 o clock position which will hopefully stop my heating from coming in randomly.

There’s a Honeywell frost stat on the wall next to the boiler. Took the cover off and found the dial was positioned with the 5 and arrow pointing in the 9 o clock direction. Am I right this should be pointing to 12 o clock to set it to 5 degrees?

Thanks again for the reply. It give me another avenue to venture down in seeing if the actuator is faulty

Thanks for the reply. Does the frost stat only activate one valve, as it only the downstairs heating that comes on.

Hi All, I have a Myson MPE222 which intermittently comes on by itself for a about a minute then turns itself off. This happens randomly thoughout the day and thermostat is not calling for heat when it happens. I had a look at the wiring and the actuator seems to be wired properly. One thing...