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    Grant Vortex pro 21 Oil Boiler Central Heating Issue

    Boiler is a Grant Vortex Pro 21, installed around 6 years ago. When Central Heating is demanded from the thermostat the CH pump will come on for a couple of minutes say and then the CH pump is switched off and the DHW pumps starts, the flow light is not lit, this cycle continues varyingly. As a...
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