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Vaillant Boiler Issue

Discussion in 'Plumbing and Central Heating' started by Peter GEE, 29 Dec 2020.

  1. Peter GEE

    Peter GEE

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    I have a Vailliant boiler that produces gallons of hot water with no problem but no hot water for central heating. The boiler is pressured and holding well. The pump gets hot but nothing after that shows any heat. Has the pump failed? When running I canot feel any vibration from the pump. Is there an easy way to test it? We are in lockdown and do not want anyone here and I have changed pumps before so is it worth trying a new pump? It is a VP5-ZE15PC PUMP.Thanks
     
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  3. Wayners

    Wayners

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    All rad valves are (thermostats) open and no air in them?
     
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  4. Peter GEE

    Peter GEE

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    yes all fine
     
  5. CBW

    CBW

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    What model of Vaillant?
     
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  6. Peter GEE

    Peter GEE

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    VCW GB 242 EH VCW GB 282 EH
     
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  7. CBW

    CBW

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    I would be looking more towards the diverter arrangement, like the microswitches, servo valve, diaphragm etc. You’re getting hot water so wouldn’t have thought the pump.
     
    Last edited: 29 Dec 2020
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  9. ianmcd

    ianmcd

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    it is not the pump, as already suggested look at the diverter valve
     
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  10. Peter GEE

    Peter GEE

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    Right now when switching on power the fan starts up continues for ever and the boiler will not light up when switched on, The pilot lamp "operator on" does not light. Now baffled.
     
  11. Peter GEE

    Peter GEE

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    I have looked at the diverter valve and the pin is protruding out turning on hot water and the pin does not move. Boiler does not light fan runs. No green light. When I press the differential valve cam the diverter valve moves.
     
  12. Peter GEE

    Peter GEE

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  13. Peter GEE

    Peter GEE

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    We have a working boiler. It was decided to fit new water valve, new diverter valve new microswitch and servo. Fired up first time Hot water galore and hot radiators.Thanks for giving such good advice.
     
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  14. DIYnot Local

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