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Thanks for the info! :D :D

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

Replaced the PCB and the thermistor a few days ago and so far the boiler is working great! Thanks once again.......... HF :D

Thank you all for your replies.... Alfredo - It does still have the orange neons for the burner/reset. I have just purchased a new PCB for it and will give that a go. Thanks again. HF

Hi Alfredo Its a Glowworm Micron 50FF. Thanks... HF

Does this sound like a PCB problem? HF :cry:

gordongas Sorry, should of mentioned that this has all been checked when it was serviced a few weeks ago. 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...