Underfloor heating problem

match14 · 17 May 2011

I have an underfloor heating system in my house on both the ground floor and the first floor. The ground floor manifold operates fine but I have a problem with the first floor manifold. If the heating is on downstairs but off upstairs then the return gauge on the upstairs manifold goes up to 60 degrees C and the flow gauge reads 40 degrees C, if the upstairs comes on whilst the ground floor is on then the return gauge drops to 40 degrees C and both the flow and return gauges continue to read 40 degrees C even after an hour.

Any ideas?
Thanks.

Agile · 17 May 2011

I am not sure there is anything wrong yet.

Is this a new situation?

Both at 40 C indicates a very high flow rate and the pipes up to temperature. Not necessarily wrong.

But we need further details of your system! Does it have a circulating pump on each manifold?

Tony

match14 · 17 May 2011

It has always been like this, there is a pump on each manifold and a pump at the boiler too.

The system in question is this one.

http://www.ihsenergy.co.uk/format/images/pdf/ihs_install_manuals/Manual_2008_Danfoss_Wiring_.pdf

oilhead · 17 May 2011

May sound silly, but check that the pumps are both installed the right way, and that they pump from the same flow pipe. Saw one a couple of months ago where the upstairs circuit drew from the flow pipe, but the downstairs one from the return. It had been like that for 6 years.

match14 · 18 May 2011

Ok I'll check that out. Would I just disconnect the flow and return from the boiler at the manifold and see which one has water coming out from it?

oilhead · 18 May 2011

You need to be able to follow the pipework from the boiler or thermal store. How far apart are the Manifolds. There will be a directional arrow on the pump body.

match14 · 18 May 2011

Manifolds are 12metres apart.

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Underfloor heating problem

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