Best answer by Lucy_OVO
If the In Home Display (IHD) is asking for a PIN code it could be that the device thinks it is trying to be removed from the network. If so, it may automatically bring up the prompt for a PIN. If this is the case try moving closer to the electricity meter and reset the IHD.
If you've accidentally clicked on the Wi-Fi symbol it'll ask for a PIN.
Updated on 12/07/2019