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couple of quick questions that've been bugging me... 1) does a zero pressure governor in a boiler replace the air prssure switch or fan thermistor, to prove the fan is operating correctly, before ignition takes place. are zero pressure governors common nowdays? 2) does a system boiler...

I hope somebody is able to help me. I am trying to find out for my coursework the opeartion of a gas cooker and gas fire. I have searched the web and not found anything helpful at all. I suppose this is the correct forum to ask for help in? I know a fire uses piezo-electric spark...