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the fault lies between the uh8 and stat, the stat is low volt and sends a signal to a relay that then sends a signal to the UH8. Ive taken out all the therms on one UH8 and attached a cheap rotary therm and it works perfectly. I have now sent of to wandsworth for new thermo relay. TY for your...

Hi All Help required if you can, so I have a multi zoned UFH system (6 zones ) on an S Plan. The basement UH8 works perfectly with all Therms down on temp power light only on, if temp pushed up then that relevant zone comes on and the pump and valve light comes on as should and when shut down...