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Thanks for the help so far guys. I've turned the cylinder stat down to 50, but the HW is still scalding hot. The motorised valve is a Honeywell 4073A model with 'auto' on left and open/man on right. The lever seems to be permanently in the auto position. I don't think I've ever seen it on...

I know this problem is well documented as I have read all the related posts. I have taken a lot of the advice on board but not found the solution. I have suffered with the dreaded lockout for about a year. I have had replaced the PCB (brand new one), Air Pressure Switch and, I think, the...