702 Medium
Your boiler has detected a fault with a temperature sensor serving a secondary heating area, meaning that specific zone may not heat up correctly.
Technical description: Send sensor defective (Zone 2)
Typical repair cost: £100-180 (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 702 — no call-out fees, no surprises.
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Parts commonly replaced
- Zone 2 flow temperature sensor (NTC)
- Wiring harness
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