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Discuss NO I AM NOT AN UNDERFLOOR HEATING EXPERT! in the Underfloor Heating Forum area at PlumbersForums.net

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Harvest Fields

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I am no underfloor heating expert. But would be grateful for any help. Can someone tell me why when the UFH is on and nothing else is on. The radiators get hot. And no it's not the 2 port valves. They are both cold both sides? But somehow the return pipe for the heating gets hot? I'm thinking reversed circulation but cannot see where?:mad::mad:
 

SimonG

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Sounds like reverse circulation. Can only be that if the 2 ports are cold.
 

SimonG

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Between the underfloor return and rad return.
 
O

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Good question though, never came across this type of issue. But if You both think it's the reverse circulation then how does that work
 
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Harvest Fields

Harvest Fields

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Between the underfloor return and rad return.
I can see where all 3 returns meet as all the valves and the unvented are in the loft with the boiler. How do o fix it mate?
 

SimonG

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Easiest is to put a non return valve on the heating circuit return just before it tees back on.

My responses are a little slow and out of sink as my posts have to be ok'd.
 

deg

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Non return valve between the two should do the job if the returns are exposed.
 
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Harvest Fields

Harvest Fields

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Easiest is to put a non return valve on the heating circuit return just before it tees back on.

My responses are a little slow and out of sink as my posts have to be ok'd.
No worries mate. Been a naughty boy?:p
 
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Harvest Fields

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So I have been back and fitted the non return valves. The rads are still coming on when the UFH is on? Any more ideas?
 

townfanjon

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Blimey weird one this , is there a pump on the heating and one on the UFH or has sombody tried to use just one ? Bypass anywhere ?
 
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