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