2
FAULT CODE
Halstead
Overheat Lockout
High Severity
Engineer Required
The safety thermostat has activated due to overheating. The boiler has shut down to prevent damage.
Step-by-Step Fix Guide
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Step 1
Allow the boiler to cool for 30 minutes
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Step 2
Check system pressure — repressurise if low
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Step 3
Reset the boiler
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Step 4 Engineer only
If it recurs, call a Gas Safe engineer to check the pump, system circulation and thermostat
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.