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