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    No fan, pump working. How to test fan relay?

    For a Halstead Quattro Combi (LPG). Overheat thermostat ok, circuit closed, Pump overrun thermostat working, closed circuit common to one, but not the other. Pump operating fine, a number of clicks suggesting microswitches ok. Live power getting to Ignition board, but nothing getting to...
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    How do I know the overheat thermostat is faulty? Combi

    Halstead Quattro Combi. I'm getting pump but no fan on both CH and HW. No power to fan (and obviously no ignition or gas flow). Tha manual suggests resetting the overheat thermostat by pressing a rod on top of the case which resets a jigger on the thermostat, but the thermostat is already...
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    Pump working, but no fan and no spark

    I finally sorted out everything on the Halstead Quattro, except for putting on a new diverter valve, since the old one was seized and not responding to working with silicone. After refilling and bleeding the heat exchanger, tried to fire up, but no heat. The pump is working fine, and both...
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    Pinhole leaks in Halstead Quattro Combi

    I have a 1994 LPG Halstead Quattro Combi. I have just replaced the diverter valve diaphragm, unseizing and greasing the rest of the diverter valve. When I put it together, I created two pinhole leaks in the 15mm DHW inlet pipe close to the mount which sprayed water all over the electrics as...
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