DHW was perfect, then erratic, now useless, though CH seems to be OK. I don't understand what is going on and I don't want to replace bits at random (!) - if anyone could shed some light I would be very grateful.
The hot water runs for a few seconds, then the boiler shuts off. A 'Reset' gets things going again. The length of the run time has steadily diminished over the last year or so.
The boiler is a Ferroli Domina, approx 10 years old, and the Ferroli help line suggested replacing the DHW thermistor. I've bought a replacement thermistor but plugging it into the connector in 'dangle mode' seems to kill the DHW completely, yet another thing I don't understand!
Any ideas from the gurus?
Thanks Tim