Right, good news at last.
2nd new flow turbine turned up in the post this morning. Connected it to the boiler. Turned on the boiler and bingo hot water again.
So the original flow turbine was faulty and the 1st new one I bought was also faulty and there was nothing wrong with the original PCB. Unbelievable! It could only happen to me.
Thanks again for all the help chaps.
2nd new flow turbine turned up in the post this morning. Connected it to the boiler. Turned on the boiler and bingo hot water again.
So the original flow turbine was faulty and the 1st new one I bought was also faulty and there was nothing wrong with the original PCB. Unbelievable! It could only happen to me.
Thanks again for all the help chaps.