80-01 High
Your boiler has detected a problem with the sensor that monitors the temperature of the water returning to the unit, causing it to stop for safety.
Technical description: Return temperature sensor error – reset the boiler
Typical repair cost: £120-£190 (including labour)
DIY fix possible
Press the Reset button on the boiler control panel onceWait for the boiler to complete its restart sequenceIf the code persists, contact a Gas Safe registered engineer
Protect yourself from future repair bills
A boiler cover plan would cover faults like 80-01 — no call-out fees, no surprises.
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Parts commonly replaced
- Return temperature sensor (NTC thermistor)
- Connecting wiring harness
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