166 High
Your boiler has detected an issue with the way it is venting or drawing air, causing it to shut down for safety.
Technical description: Air pressure switch fault
Typical repair cost: £120-220 (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 166 — no call-out fees, no surprises.
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Parts commonly replaced
- Air Pressure Switch
- Venturi Tube
- Fan
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