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OK, an update in case it is useful to anyone else with the same system. Once you start labelling up and removing wires it becomes quite clear which are just trigger wires from the thermostat. Wiring ends up being: Both Earth wires transfer to the Hive Earth tether The Danfoss N (Neutral)...

Hi All, After some advice if I may. My existing Danfoss FP975 controller has died again (second one in 4 years to die). So decided time to move to something a bit more intelligent and have purchased the Hive Active. It is a 2 channel system with a Danfoss remote thermostat. Wiring of the...

Thanks for that, was along the lines of what I suspected. Any particular model of Grundfos recommended, needs to be suitable for a micro bore system?

The pump on our central heating stopped working. Whilst having a look to see where the fault could be I found that pushing gently on the speed setting switch the pump would activate. The pump is a PTS Pump 5 (6 bar IP42). Is this a know issue and easy to fix, or is it a replacement pump...