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Thanks for the ideas. Thermostat on CH - Turning up the stat calls for heat, and the pump runs, but the boiler does not ignite. Thermostat on hw store - Does this affect the CH? Switch contacts on hw flow switch - Does this affect the CH? Call for heat electrical connection - unless...

I know this is an old boiler and I am having difficulty in finding someone who is prepared to even look at it. The system works fine for the Hot water, but the heating has stopped working. The pump is running (taken end off the pump and can feel the impeller turning) but the main burner will...