E 16 High
Your boiler has detected a fault with a secondary temperature sensor that monitors water returning to the unit, causing it to stop operating for safety.
Technical description: AUX return sensor failure
Typical repair cost: £120-220 (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 E 16 — no call-out fees, no surprises.
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Parts commonly replaced
- AUX return temperature sensor (NTC)
- Wiring harness
- Control board
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