DIY Doctor

Polypipe Multizone Underfloor Heating System Stopped

Postby Matt74 » Fri Mar 08, 2019 12:16 pm


I have a polypipe multizone underfloor system that stopped working a few weeks ago.

The control unit shows a red led for Valve, green led for Power and no light at all for Pump or Boiler.

Hot water and radiators are fine. My hunch is the grundfos pump has died as I had been hearing screeching for a few days before it all stopped. Now the screeching has stopped and so has the underfloor heating!

Any help would be apprecaited.
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