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Thanks Ian. I've just fired it up again. The pump was vibrating and hot water was pumping through it (although the pump and pipes from it are very hot to touch). It tripped again after about 5 minutes, this time after the boiler stat reached its temperature and was cooling down before...

Hi I have a Glow-worm back boiler which is giving me grief (I would have upgraded it by now but its a listed building and there's issues with venting through the external wall and I'm reluctant to go with an electric boiler instead (because of the consumption cost)). It's a sealed system. The...