While you wait for answers, we may have found some information which could help you.
Success
Message
heatline boiler c24?
problems with hot water on heatline viso 24?
how can i fix it?
What can I do when my Heatline C24 boiler continuously cuts out?
Heatline combi boiler on 4 and going past what can I do?
my actuator on heatline c28 is wet?