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Boiler cut out trip re set, boiler now working. What should the working pressure be it gets to around 2 bar, and fluctuates, after drawing water the pressure drops to around half a bar. Does this mean the Safety pressure valve needs replacing. On the relay, that operates the pump, should...

New house occupier, boiler set to 1 bar lockout light keeps appearing. The boiler doesn't light up, and the DHW pump doesn't appear to be running. Is the pump likely to be defective??