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View the thread, titled "Polypipe underfloor heating not heating up properly after a few years" which is posted in UK Plumbers Forums on UK Plumbers Forums.

Had polypipe underfloor heating installed around 4 years ago. Flow rate used to be around 2.5 l/m now its just over 1 l/m. Tiled floor now is heat patches
I have a nest connected to this also. And 3 zones come on at once in same port on slave unit

I've changed the pump, diverter valve and mixing valve with no change in performance. Also I've connected a hose for each of the 3 zones which I get 3 l/m. I don't know what else to do. Ay help?
 

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I think your pump is set wrong it’s on pressure instead of constant as the 3 lights arnt illuminated

Press and hold the setting button for 3 seconds then it should be on constant if the leds are flashing press and hold for another 3 seconds
 
I think your pump is set wrong it’s on pressure instead of constant as the 3 lights arnt illuminated

Press and hold the setting button for 3 seconds then it should be on constant if the leds are flashing press and hold for another 3 seconds
I did change that earlier. it's on cont curve 1.. the first 3 lights...
Been on cont curve for 2 hours with no difference
 
When I have underfloor heating on only the system boiler has a c and burner flashes. When I turn on central heating c comes on and burner light is solid. Boiler is icos 12he.
I assume its a circulation problem
 

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Title
Polypipe underfloor heating not heating up properly after a few years
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UK Plumbers Forums
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warmer82,
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ShaunCorbs,
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