0A15 High
Your boiler has detected that the temperature readings coming from its internal sensors don't match up, so it has shut down to prevent overheating.
Technical description: Flow and return sensor anomaly detected.(incorrect temperature value shown on sensor.)
Typical repair cost: £120-240 (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 0A15 — 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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