Underfloor Heating problem

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Hi,

Could some help please. I have a 10 year old water underfloor heating system (JG Speedfit kit) which has been working well until last week. The system is connected to the boiler and is also linked to the hot water and central heating system.

When the hot water or central heating comes on, the UW pump runs and hot water goes into the underfloor system, even of the UW thermostat is off. The UW pump goes off when hot water or CH switches off. Any thoughts on what this could be? I was wonder if one of the valves near the hot water tank was stuck or whether it's something else. Just a bit worried that if I call someone in they might insist the whole manifold system needs changing when it may be something else.

Thanks in advance
 
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Please let me know if I can provide any other information to help. Alternatively, if someone can recommend a UFH (water) repair specialist in the West Midlands, that would be great. Thanks.
 
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So are you saying that your UFH comes on even when it's supposed to be turned off? As in the floor gets warm? Can you post a photo of your manifold?
 
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That's right, even with the UFH thermostat turned right down, the UFH comes on when the Central Heating or Hot Water comes on. I can send a picture of the manifold later, but I've attached a picture of the kit used. Thanks
IMG_20171204_080738_01.jpg
 
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