Flashing red light on control panel

Could be a wiring fault ,check that all the plugs and sockets to the house correctly wired 

have you got a plug/socket tester 

what "panel " is it

As JVB questioned, I think you need to tell us if it's the main control panel or the heating/hot water control panel, the make and model number.

Meanwhile, have a check on Google using the make and model details. 

Does the flashing stop when the EHU is unplugged?

💡Reversed polarity?

As a matter of interest what does your handbook say about a red flashing light?

Thanks everyone for your input but cannot find anything in handbook about flashing red light. Just returned from a 2 month tour of Scotland with no problems at all.

Main Control panel for lights water pump etc on our Adria Compact dl m/h  just put it on EHU at home to top up batteries. 

Once again thanks for all your help.

I meant the make and model number of the control panel.....

If it's like the one in our MH, it may not have one. Ours just has a Hymer logo.

Maybe a Schaudt unit? You could reset the control panel by disconnecting the batteries. If that clears the error you might have experienced a voltage spike?

Control panel is the Nordelelttronica ne266 on our 2020 Adria Compact motorhome. No mention of P30 in owners manual so I am stumped. Tried to contact Becks motorhomes but are closed until December. Many thanks to all. MIck