E03 High
Your boiler has switched itself off because it has reached a temperature that is too high and needs to cool down and be checked.
Technical description: Overheat lockout
Typical repair cost: £120-£350 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E03 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation pump
- Overheat thermostat
- Heat exchanger
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