EE4 High
Your boiler has detected that the electrical wiring coming into the unit is connected the wrong way round.
Technical description: Supply L and N are reversed
Typical repair cost: £80-140 (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 EE4 — no call-out fees, no surprises.
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Parts commonly replaced
- Electrical wiring (correction)
- Fused spur unit
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