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    Nest Thermostat

    I have the nest 3rd gen; stat, running with a heat only boiler (Vaillant) on a Y plan system. Cylinder stat -Honeywell L641A1039 3 way motorised valve Danfoss HSA3. The problem I have is with the HW scheduling, I have scheduled HW twice a day 1 hr each time, ie; 0700/0800 & 1700-1800 However...
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    Danfoss Randell Type HSA3

    hi I just replaced mu 3 port valve with the above valve, Wires are Blue,Orange,Grey, Brown/white,(4 wires), (I have no wiring diagram) When calling for heating, I get hot water,clearly I have 2 wires connected incorrectly . My question is, Which wires have I got wrong.:eek: Thanks
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    Vaillant Ecotech Plus 24 kw

    The hot water on the above boiler is running cold showing S53,only one fault code showing F22,I suspect that's historic. I have just changed the programmer because the original fault was no heating,which fixed that problem. However the customer asked me to check the HW supply it was then I...
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    Vaillant 424 open vent ,pump over run.

    Have just installed my boiler with the nest thermostat,the pump is connected directly into the boiler, My problem is the pump is running after the default setting on the boiler,ie;pump is running almost constantly,has anyone had this problem.
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