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    No HW but CH OK on a Gas Rayburn

    Gas Rayburn 480AL, Honeywell V4073A 3 port zone valve, Drayton LP241 programmer. Switching on CH alone at the programmer :boiler burner ignites and CH operated normally. Switching on HW alone: burner does not light. When CH is switched on and running normally, switching on HW cuts off the...
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