How much does it cost to fix Johnson Starley error code E10?

Typical repair cost for the Johnson Starley E10 fault is £120-220 including labour.

E10 High

Johnson Starley E10 Fault Code

Q: What does the Johnson Starley E10 fault code mean?

Your boiler has stopped working because the internal drainage pump cannot clear the water it produces, causing a backup that has shut the system down for safety.

The Johnson Starley E10 fault code means: your boiler has stopped working because the internal drainage pump cannot clear the water it produces, causing a backup that has shut the system down for safety.. It appears on 1 Johnson Starley model in our database.

Technical description: Condensate pump fault / high water level

Typical repair cost £120-220 (including labour)

DIY fix possible

Check if the external plastic drain pipe is frozen or blockedEnsure the pump unit is plugged in and receiving powerGently check the drain tube for any visible kinks or debris

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Johnson Starley models that show the E10 fault code

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

C16u Repair: £120-220

Source

Johnson Starley E10 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