E15 High
Your boiler has shut down because its internal temperature sensors are giving inconsistent readings and can no longer monitor the heat safely.
Technical description: Sensor drift lockout
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 E15 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow NTC sensor
- Return NTC sensor
- Wiring harness
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