It flashes 8 times. It’s been doing it intermittantly for a few weeks but now it refuses to do anything but that. It’ll start filling with water then give up, start pumping the water back out and the dial spins giving the fault code of 8.
I’ve already replaced the temperature sensor and I’ve checked all the wiring from the heater using a multimeter.
The intermittant nature makes me suspect a sticking relay. Plus searching around on google also seems to suggest that the relay is unreliable.