C4 273 High
Your boiler has stopped working because the internal fan has been running non-stop for too long, causing the system to shut down for safety.
Technical description: Continuous fan operation for the last 24 hours – appliance temporarily blocked
Typical repair cost: £180-450 (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 C4 273 — no call-out fees, no surprises.
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Parts commonly replaced
- Fan Assembly
- Printed Circuit Board (PCB)
- Harness Wiring
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