412 Medium
Your boiler has lost communication with the temperature sensor that controls the second heating zone in your home.
Technical description: Room sensor circuit open or short circuit zone 2
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 412 — no call-out fees, no surprises.
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Parts commonly replaced
- Zone 2 Room Sensor
- Sensor Wiring Harness
- External Clip-on NTC Sensor
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