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I have a variable speed pump with 3 settings, does it make a difference what setting this is set to? It was originally set to the second position but was recently changed to the higher setting by a plumber, just curious what difference this will make. Thanks HF

Hi I had a glowworm boiler fitted about 5 years ago and recently it has been doing strange things, it seems to function normally until it has operated for about 15-20 mins (or has warmed up) then the fan will come on as though its going to light up then it stops then almost immediately does...