Hi i have a pott promax he24 plus boiler, the hw is fine but no ch it is about 5years old can anyone please advise. When i switch to ch the boiler fires up but when i switch to ch it does not fire up ?? when both on togrether it fires up till hw gets to temp ??
You need to turn off electric to heating system, temporarily disconnect the orange wires, leave safe, turn back on, select CH only and check to see if there is 240VAC on the CH valve orange wire.
Only do this if you feel competent at testing live electrics, otherwise get a heating engineer or sparks in.
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