Broadway (2011) Water Heater/ Fridge

The water heater in my Broadway EK (2011) intermittent drop out when on mains. When it drops out the fridge drops out too. Any ideas please? PS. Breakers all OK, fuses all OK. Baffling

There are in line connectors in the wiring loom, one of them could have worked loose.

Still not found a solution to my water heater and fridge not working on mains. As soon as I put the water heater on the fridge stopped working. Now neither will work at all on mains. Breakers all fine. Local service agent, who admits he isn't an electrician, is baffled.  Anyone know of a good electrical repairman near Poole in Dorset please?

I've used Essanjay:

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Many thanks