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i need to turn off the mains water supply to a Worcester Bosch 24CDi boiler while I work on the mains pipework. When I turn the supply back on, will the boiler air-vent automatically vent any trapped air. Will I need to open the air-vent manually. Thank you

Over the past two weeks my central heating has developed an intermittent fault. For no apparent reason the heating cycle stops even though all the requirements to provide heat are satisfied i.e. power from room thermostat OK, timer in it’s timed ON cycle and all terminals from the timer...