L10
FAULT CODE
Ideal
Overheat Lockout — Maximum Temperature Exceeded
High Severity
Engineer Required
The boiler has reached its absolute maximum temperature and locked out. A more severe overheat than L1.
Step-by-Step Fix Guide
-
Step 1
Turn off the boiler immediately and allow to cool for at least 30 minutes
-
Step 2
Do not attempt to reset until cooled
-
Step 3 Engineer only
Call a Gas Safe engineer — this indicates a serious circulation or pump problem
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.