My Glowworm Micron boiler ignites and heats my water, but does not heat the radiators. The whole system is only 7 years old. Please help as it's getting cold now. Thanks.
sounds like the diverter valve next to the hot water cylinder is not switching over. turn off the hot water and turn on the heating and see if the lever or indicator on the valve moves.
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Try fixfault.com to fix home heating systems.