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Don't know your system but could be the actuator on the hot water divert -usually you have the option for heating and/ or hot water controlled by a valve that lets hot water from you boiler through the coil in your hot water tank. If you have a new style mains box possibly one of the circuit...

My son's astra has perennial problems with heater circuit. Has an earthing fault that causes the whole thing to fuse every now and then. Last time it fused the whole switch stopped working. Easy enough to change the switch, it prises out of the dash with a screwdriver, I use a fine flathead...

Thanks, know what I need to do now!

We've bought a house where the central heating pump is forcing the water the wrong way through the boiler. :( It is a Grundfos selectric UPS15-50 Pump. Is there any way I can reverse the flow direction without completely removing the pump from the system and turning it around? For instance...