How much does it cost to fix Johnson Starley error code E16, E17, E18?

Typical repair cost for the Johnson Starley E16, E17, E18 fault is £120-240 including labour.

E16, E17, E18 High

Johnson Starley E16, E17, E18 Fault Code

Q: What does the Johnson Starley E16, E17, E18 fault code mean?

Your boiler has stopped working because its internal temperature sensors are giving conflicting readings or appear to be stuck, causing the system to shut down for safety.

Also written as E16E17E18 — same fault.

The Johnson Starley E16, E17, E18 fault code means: your boiler has stopped working because its internal temperature sensors are giving conflicting readings or appear to be stuck, causing the system to shut down for safety.. It appears on 6 Johnson Starley models in our database.

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.

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Johnson Starley models that show the E16, E17, E18 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Johnson Starley E16, E17, E18 fault code information on this page is sourced and cross-checked against the official Johnson Starley service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026