D
dleader
Hi Folks, I've just installed a Ferroli Optimax HE 31 initially it seemed to be working fine but now (2 days later) it has started playing up. Works OK on CH mode but when it switches to DHW the water is hot and flows fine but then when the tap is turned off it goes to D1 for 2 minute (which is correct) but then when the boiler restarts the temperature rises very rapidly there is a bit of a bang and then fault code A03 appears. Resetting the boiler works and the CH comes back on, until the hot water is used again. I'm wondering if the diverter valve is sticking in DHW mode causing the system to overheat. Anyone got any other ideas.
thanks
David
thanks
David