Plumbing Questions? Ask a Plumber for Answers ASAP
Hi . most likely your hot water flow switch . if the cheating is working this confirms all major parts are ok apart from hot water flow switch
Apologies mate, was off retracing what I had done prior to the DHW not being available, basically the valve was not back to normal operation after filling.
Now have my hot water back and I'll go backunder my rock
No probs , all the best