Potterton Suprima 30-80
Boiler intermittently (every few days) locks out on what I assume is overheat. Unfortunately the unit is some distance away at the flat of an elderly (geriatric) relative so the symptoms leading up to the lock-out are unknown.
Before calling in a service engineer I would like to be better informed; hopefully to avoid a series of call-outs.
Is there anything I should be particularly looking at?
System pressure looks OK, by-pass is open, the slide switch on the controller has lost the *detents* and I don't know what geriatric fingers have been doing in between failures.
Pressing reset invariably gets the boiler going for a few more days.
regards