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  1. M

    Central heating switches off when cylinder stat up to temp

    Conventional gravity fed system with 3 port valve and HW cylinder stat - unless the cylinder stat is triggered, the CH pump will not run. Consequently, HW temp has to be up much higher than I would like, in order to heat the radiators. System is Danfoss AT tankstat and Danfoss programmer, and a...
  2. M

    Loss of heat to radiators, but still hot water - usual suspects seem ok...

    Glow worm Hideaway boiler, Honeywell 4073 3-port valve, Grundfos pump, microbore pipework. System has had no recent physical changes – heating back on after summer and running for some weeks since then. Recent sudden loss of heating but still hot water present in tank. Turning CH on and off with...
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