0A17 High
Your boiler is struggling to heat up properly because the system isn't sensing the expected temperature increase when the unit is running.
Technical description: Return sensor temperature rise incorrect (time taken for flow temperature to rise is too long.
Typical repair cost: £120-280 (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 0A17 — no call-out fees, no surprises.
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Parts commonly replaced
- Return NTC thermistor
- Circulation pump
- Main heat exchanger
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