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Hi, I am hoping to replace an old thermostat with a Netatmo one, by attaching the four wires from the Netatmo into the Potterton boiler Terminal Block following the Netatmo guide (also here:
). The boiler is a Potterton Promax Combi HE Plus.
It looks pretty straightforward except that the existing wiring that I will be replacing includes an earth wire, where the Netatmo doesn't (only black/grey control wires and brown/blue live and neutral wires).


Do I need to connect an earth wire somehow or is the boiler already earthed before reaching the terminal block?
Many thanks.
It looks pretty straightforward except that the existing wiring that I will be replacing includes an earth wire, where the Netatmo doesn't (only black/grey control wires and brown/blue live and neutral wires).


Do I need to connect an earth wire somehow or is the boiler already earthed before reaching the terminal block?
Many thanks.