E83/E84/E85/E86/E87 High
Your boiler's internal computer has lost contact with its sensors or other parts, meaning it cannot receive the signals it needs to operate safely.
Technical description: No communication.
Typical repair cost: £120-450 (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 E83/E84/E85/E86/E87 — no call-out fees, no surprises.
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Parts commonly replaced
- Main PCB (Printed Circuit Board)
- Wiring harness
- Interface cables
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