E16, E17, E18 High
Your boiler has detected that one of its internal sensors is frozen or stuck at a specific reading, causing the system to shut down for safety.
Technical description: Sensor stuck lockout
Typical repair cost: £120-£240 (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 E16, E17, E18 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow thermistor
- Return thermistor
- Wiring harness
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