How much does it cost to fix Johnson Starley error code ER 16 + RESET?

Typical repair cost for the Johnson Starley ER 16 + RESET fault is £120-£350 including labour.

ER 16 + RESET High

Johnson Starley ER 16 + RESET Fault Code

Q: What does the Johnson Starley ER 16 + RESET fault code mean?

Your boiler has detected that the water temperature difference between its pipes is too high, causing it to shut down to prevent overheating.

Also written as ER16RESET — same fault.

The Johnson Starley ER 16 + RESET fault code means: your boiler has detected that the water temperature difference between its pipes is too high, causing it to shut down to prevent overheating.. It appears on 1 Johnson Starley model in our database.

Technical description: Differential over-temp across DHW flow/return

Typical repair cost £120-£350 (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 ER 16 + RESET fault code

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

Warmcair DW Repair: £120-£350

Source

Johnson Starley ER 16 + RESET 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