Hi Agile and Ollski, and all the previous writers.
Thanks very much for your continued support and I'.
The first thing I,ve done this evening is to dismantle the valve which was a bit sticky, and did'nt spring back completely into DHW position. I cleaned it and now it ioperates as it should. The actuator also operates correctly both ways.I was hoping that this would sort it, but no! On ignition, dispaly on "D", the boiler fires, valve to CH then immediately back to DHW position, then switches off!
I try to start the CH, nothing still
So, I've taken the DHW sensor out and tested the resistance at 25 deg, then higher at about 60deg and got the resistance expected by the manual.
I've also cleaned the rod (looks like copper?), reinstalled the sensor, connected it back
and tested for resistance again at each connection up to the PCB.I get a reading reaching the top enf of the range recommanded by the book.
So this sensor seems ok...?
So when I try to switch on tomorrow morning, I am hoping that this last operation will be success! Positive frame of mind is the key.
Good night for now...
Many thanks