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grundfos alpha

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    Heating not working. Help required to Diagnose

    I have a Glowworm Ultimate 80FF boiler providing hot water and central heating (more than 15 years believe). Cold water tank in attic. hot cylinder (CYL) in airing cupboard with 3 port divertor valve (VALVE), drayton control programmer (PRG) and grundfos alpha pump(PUMP) fitted as well. Recently...
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