C5
FAULT CODE
Ideal
Rapid Temperature Rise
High Severity
Engineer Required
Flow temperature rising too quickly, indicating poor circulation.
Step-by-Step Fix Guide
-
Step 1 Engineer only
Check system pressure and pump operation
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.