Yes mate, there was only the thermistor left to change. It has had a new phex, gas valve, pcb, fan, aps, venturi, so I went out to fix it and the office phoned and said leave it we are sticking a new one in. I took out the thermister fired it back up and the water got red hot, put it back in and the fault reappeared. glad to be honest it looked like a nightmare, the prv was discharging into the toilet pan. It was a vipers nest of bad work. And the house was an absolute dump.