11 High
Your boiler's temperature sensors are giving conflicting readings and cannot accurately tell how hot the water is.
Technical description: Flow/return sensor calibration error
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 11 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow Thermistor
- Return Thermistor
- Wiring Harness
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