E5
FAULT CODE
Intergas
Overheat Lockout
High Severity
Engineer Required
The boiler's overtemperature protection has activated. On Intergas boilers this typically means the heat exchanger has reached an unsafe temperature.
Step-by-Step Fix Guide
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Step 1
Turn off the boiler and allow to cool for 30 minutes
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Step 2
Check system pressure
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Step 3
Bleed radiators
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Step 4
Reset once
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Step 5 Engineer only
If E5 returns, call a Gas Safe engineer — the pump, expansion vessel, and heat exchanger should be checked
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.