We may have found other answers which could help you.
Success
Message
c/h hotwater?
DHW Run's hot and then goes cold?
what part do ineed?
shower in bathroom keeps going hot then cold then hot etc?
Ferroli Boiler Optimax HE 31C?
DHW running hot then cold?
ferolli modena 102?
2 amp fuse blown?
falling presher?
High pressure on my Optima Ferolli 901 central heating?
Can't get hot water but central heating is working fine, any ideas??
how can i fix this ?