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Had the boiler from new its 15 years old now (like triggers brush many new parts). Only just noticed that the burner has started ffiring when programmer is set to off & there is a demand for hot water. I certainly cant recall that it did this before and it seems to be against what’s quoted from...

Off mode The central heating system will remain off unless there is a demand via the frost thermostat (when fitted), whereby the frost thermostat will activate the pump and burner until the demand is satisfied. The burner will remain inoperative in all other circumstances. If a demand for...

Thanks for your reply muggles Taken from the manual "Flow Switch The domestic mains water inlet is connected to a flow switch which detects when a domestic hot water tap has been opened. This activates the burner and pump when the Domestic Hot Water mode or the Central Heating and Domestic Hot...

Boiler burner has started firing when hot water tap is turned on and the separate heating/water controller in the kitchen is set to off. Is this a fault with the flow switch or motherboard?