Heatmiser UH8-RF wiring centre UFH heating actuator wiring

Heatmiser UH8-RF wiring centre UFH heating actuator wiring

Heatmiser UH8-RF wiring centre UFH heating actuator wiring

Hi

Please help look at my wiring . Usually the ufh actuator connection to the zones in the wiring centre is straightforward L and N . But I have a grey coloured wire on one of the zones . Is this done correctly and what is this grey wire for ? The zone comes on as usual when I fire up with the thermostat . But I rather pick up a potential issue now before it becomes a problem.

Thanks

by microways85

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