Tick or click sound from PowerHouse 535 when inverter enabled

I have a PowerHouse 535 that makes a periodic (every 2 seconds) tick or click sound when the inverter/sockets are enabled.

Anyone else have the same?

Support say its faulty and have provided a replacement but that does the same thing.

Hi @matt.ryan Welcome to the community, gonna close this one as a duplicate of your more detailed topic.

Often helps with getting more replies