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The resistance across the regulator terminals is Mega Ohms i.e. open circuit! should it read a resistance?

:( I have a Thorn M - gas fired boiler (20 years old?). When I tried to switch to heating this morning it did not work. The pilot light to the boiler is on, the pump is working and there is a 240V supply to the gas regulator (is this a solenoid?) block. I have metered out between live and...