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I would like to take out a maintenance contract on my heating system. It comprises of a Mistibushi ASHP with underfloor heating downstairs and radiators upstairs. It has run perfectly for the last 4 years until this recent issue with what appears to be caused by a motorised valve. I live on the...

Hi ProDave. The controller did not go into fault mode imediatley, it took arounf 15 minutes. I have manually operated the motorised valves and touch wood it run for the last 24 hours as normal. Thanks to you and all the other guys for your help.

Hi Sharpend. Thanks for your reply. I have checked the fault out a bit further. It seems the controller is fine if the hot water system is turned off and it's working the underfloor  heating, It only throws up the fault code when the hot water system is selected.

I am trying to resolve an issue with a underfloor heating system running from an ASHP. The controller comes up with fault code U1 which Mitsibushi tell me indicates a high pressure fault. Has anyone any experience of these systems and can they advise me how the diagnose the problem, I assume...