F.72 High
Your boiler has detected that the temperature readings between two sensors don't match up, which prevents it from heating your water safely.
Technical description: Flow return NTC error – temperature difference too great
Typical repair cost: £90-180 (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 F.72 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow NTC sensor
- Return NTC sensor
- Sensor wiring harness
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