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Umm, still in the dark. Guess the plumber will be making a trip out then. Thanks

Cheers. But if the boards faulty, surely then nothing else would work right?, or wrong?

Hi All I have downloaded the Honeywell error codes list, and followed the instructions to sort the F5 error code i was met with this morning on my controller. It ays F5 is a HW open circuit. I have changed the cables from base unit to actuator, and swapped the actuator [from the CH just to...