Turned out The issue for my caravan was a faulty water heater pcb board even though the pcb showed a flashing light on which whale said was working ok.
Apparently it’s a common fault with this Whale component
I have a compass casita 860 with a whale water system, I tried running water the pump and the toilet flush is not running. We have tried a new pump, changed the fuses and still no 12v power going to either. Any help would be appreciated