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Well, I intend to leave it up to him, staying well away from the guts of that dinosaur :-) However, with the cooling/heating symptoms and tips above, my bets at least are on the overheat thermostat. Looking at water temperature / radiator temp, it made zero difference whether I had boiler...

Hello again, now at home and had a look at pump and electrical installation. I have to admit I'm experiencing a sense of dread trying to power pump somehow independently, its power supply is at the back and I can see wiring going into a sealed box then there's separate timer etc. So while...

Much appreciated and will do test, too - just at work still so no direct/immediate access to the gear at the moment. I might come back with some silly questions if I end up looking puzzled at the pipework and the pump installed on it :)

He's Gas Safe registered and he has done the annual full servicing a few days ago. Then this problem popped up - so afraid it may take N attempts, so far phoned him describing the symptoms and mused over possible thermocouple. There is an overheat thermostat, but thing is, I was expecting it...

Hello, I have a Glow Worm 45 backboiler unit, which started to exhibit an interesting behaviour, which is at the moment being 'guessed' by me & an engineer so I may end up paying for N experiments to repair it. 1. Essentially, pilot light is OK, room thermostat makes boiler come on...