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Mend Ferroli Optimax HE plus 31 c Heating Reset Pressure

No heating, ferroli, errors not listed?

I've got a ferroli Optimax HE plus 31 c
It's stopped heating water.
Tried resetting it and I've seen 3 different errors on screen but none are in the manual.

Sometimes it says d1.
Sometimes says --
Sometimes says a funny digit which looks like an E then 5 (but the E has the top stick missing)

The pressure is ok. And i have a prepay meter that is in credit.


Mark
September 2021
FerroliFerroli Optimax HE plus 31 cHeating, Home Heating SystemsHeating Reset Pressure

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Ferroli Optimax HE Plus 31c - No Heating