L0
FAULT CODE
Ideal
Safety Limit Lockout (Generic)
High Severity
Engineer Required
A safety device has operated. This is a catch-all lockout code when a specific fault cannot be identified by the PCB.
Step-by-Step Fix Guide
-
Step 1
Turn the boiler off at the mains for 10 minutes then restart
-
Step 2 Engineer only
If L0 persists, a Gas Safe engineer must carry out a full diagnostic inspection
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.