HL
FAULT CODE
Ideal
Overheat Lockout
High Severity
Engineer Required
The boiler exceeded maximum safe temperature.
Step-by-Step Fix Guide
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Step 1
Allow the boiler to cool
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Step 2
Check system pressure and pump
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Step 3 Engineer only
Call a Gas Safe engineer if it recurs
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.