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No ignition light when running hot tap. It does come on if I put the heating on but the hot tap still runs cold.

The CH is working fine but there is no hot water. I've increased the boiler pressure as it had dropped below 0.5 but that has made no difference. If I put the heating on constant the boiler will fire up (but still no hot water). If the heating is off, the boiler will not fire up (reset button...