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Discuss UFH causing boiler dry-fire safety cut-out in the Water Underfloor Heating Installations area at PlumbersForums.net

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Hi all
Brand new to these forums and would welcome any help.

I've recently moved into a house with wet UFH installed. It is a standard Polypipe system with manifold and zone pump (only 1 zone, but large). I've attached a diagram showing the set up and a picture of the mixer/pump combo on the UFH manifold (i.e. standard Polypipe set up). The boiler is a Baxi 133he Plus.

When the central heating and UFH both call for heat everything works fine (i.e. radiators get warm and UFH gets warm). The flow meters show that there is flow around the UFH circuit. However, when the central heating zone shuts down and the UFH still calls for heat, the boiler cycles a few times (produces heat for a couple of seconds) and then cuts-out with a dry-fire warning light.

Any ideas why this would happen? Is the Baxi output/flow rate too much for the standard Polypipe mixing valve?

Cheers
Andy

UFH.png

example of mixer.PNG
 
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