E3 High
Your boiler's electronic control centre has developed an internal fault and is unable to communicate with the rest of the system.
Technical description: Printed circuit board (PCB) fault
Typical repair cost: £250-£450 (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 E3 — no call-out fees, no surprises.
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Parts commonly replaced
- Main Printed Circuit Board (PCB)
- Wiring Harness
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