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@ericmark it's a shower pump @CountryFan the programmer is located next to the hot water cylinder and the thermostat is in the hallway downstairs

Also to note I have motorised valves and it's vented

Hi All I tried replacing my old Honeywell programmer and thermostat with the nest 3rd gen heatlink and digital display thermostat. Unfortunately things didn't go to plan as the display did not switch on! It's a bit of a complicated system as the wiring from the programmer and the thermostat all...