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Looking at the layout I think you might be right there. One side of the resistor goes to ground and the other goes to one of the contacts in a changeover relay - hi and lo fan speed seems likely :D Will check that and I can work out a resistor value if it is the case, then check the fan...

Yeh - know what you mean. I have a useful trick - put a little blob of vasalene on it, and when you turn it on, watch the vasalene, if it stays solid or slowly melts prolly OK. If it quickly melts and starts to vapourise, switch off quick and investigate further ! JB - N.W. - UK

Hi all I wonder if any one has access to a spare ingnition board (SIT type) from a Baxi Bahama 100 boiler ? There is a large resistor, number "R1" on the board that is overheated on mine and I cannot read the value. I can get one easily from the likes of CPC for pennies and a...