Discuss Wet Underfloor heating system not working in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Hi folks
New to the forum so hello to all.
I'm hoping someone can point me in the right direction. Our underfloor heating has not worked properly since we bought the house over a year ago now. We are getting limited hot spots on the floor close to the manifold but nothing much else. I don't think the warm water is getting forced through the circuits as all the flow meters are permanently at zero and I can't adjust the flow at either the flow meters or on the return manifold.
I have flushed each circuit out by hose and there was no air pockets, the flow meters did drop down when you flush each circuit individually to the max at 4. I have had the mixer value and pump replaced, to no avail.
The system itself heats from a multi fuel stove up to the cyclinder.
The system was installed by the previous owner who had no prior knowledge I am lead to believe. I am not convinced the system has ever worked properly.
Thanks in advance for any advice any one can suggest.
Masher
 
Me too pal , thats not a straight forward job. Can you post some pics of manifold , mixer etc etc
 
Can you supply some photographs, please?

Is there a zone valve somewhere that controls flow to (or from) the manifold? If the pump is okay, and the underfloor pipes are not blocked the list of remaining possibilities is rather short.
 
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Hi
The last image is a ladomat pump which circulates the water from the stove to the cylinder which is a McDonald's Thermflow vented mains system. The manifold is Myson.
I have had plumbers out to it and they added an additional pump to the hot inlet at the manifold in the hope that this would help but has done nothing either.
 
Can you supply some photographs, please?

Is there a zone valve somewhere that controls flow to (or from) the manifold? If the pump is okay, and the underfloor pipes are not blocked the list of remaining possibilities is rather short.

No other zone valve I'm aware of mate.
 
No other zone valve I'm aware of mate.

There must be one somewhere it turns off the flow pipe to the manifold otherwise theres no way of controlling the UFL .
In otherwords it would be on all summer , Its possibly behind the cupboard , but I am guessing .
 
Hi
The thermostatic mixing valve ( white knob at the base of the pump) has probably seized.
 
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There are the blue and red valves on the manifold itself, is this it. They are currently both in the open position.
 
To the right side of the blue valve. White head , that's against the wood.
 
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