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    Gas Valve info required please

    I have a Glow-worm K9049 Gas Valve 24V. What does the 'REG ADJ' screw do? What is it regulating exactly on the valve? Gas in, gas out, the switching speed, what? I understand the mechanical workings of the valve but need more info. Any help available?
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    Glow worm blowing fuses

    At least if things start glowing red we'll have some HEAT!!!! Thanks for the help Chris.
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    Glow worm blowing fuses

    The pump was the first thing I checked (before I realised it was the fuse that led to no heat). The pump is fully operational - water circulating. Pump starts working before boiler turns on so I don't think it's some sort of surge that's blowing the fuse. I'll test the thermocouple/thermostat...
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    Glow worm blowing fuses

    Fuse goes to gas valve one side then the boiler thermostat the other. The thermostat connects to 24V off the transformer. Surely the thermostat is just a switch. Are there any tests I can easily do - I'm an electronic engineer?
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    Glow worm blowing fuses

    We have a Glow Worm Majorca 2 back boiler that we plan to replace in the summer (yes 30+ years old - but been ok so far) but as luck has it, the thing has stopped functioning because of blown fuses. The control circuitry to the boiler is ok. The boiler ignites, runs for a few minutes and then...
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