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The engineer changed the pilot assembly a couple of weeks ago. I have got hold of the instruction manual and there's a fault diagnosis flowchart on the back that indicates the o/h 'stat may be the fault. Any other suggestions that I could give to him would be great.

Hi, I'm just looking for some advice. I have a potterton housewarmer 55 that keeps locking out. It seems that once the hot water is at temperature then the boiler goes to lock out. Could the problem be the overheat stat? I'm presuming it's only happening with the hot water as I haven't had the...