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When these fail does the stat usually go open or short circuit? Or could either occur? Thanks in anticipation.

Any help/advice would be appreciated ref this problem. My boiler cuts out after a few minutes running - obviously overheating. The main burner & the pilot go out & I have to wait about 5 mins before I can re-light it. I think that there is a problem with the mid-position valve as it is...

My old Apollo was working fine up until a few days ago when it went out & the pilot refused to stay lit when I released the valve. I replaced the thermocouple & the pilot head with no improvement. I eventually managed to get the pilot to stay lit when I short circuited (for testing) the...