ER 25 + RESET High

Johnson Starley ER 25 + RESET Fault Code

Also written as ER25RESET — same fault.

The Johnson Starley ER 25 + RESET fault code means: your heater tried to light several times but could not detect a flame, causing the system to lock out for safety.. It appears on 1 Johnson Starley model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Flame failure
Typical repair cost £120-280 (including labour)

DIY fix possible

Check that your gas prepayment meter has credit (if applicable)Verify that other gas appliances, like a cooker, are working to ensure gas supplyPress and hold the 'RESET' button for 3 seconds to attempt a restart

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Johnson Starley models that show the ER 25 + RESET fault code

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

Source

Johnson Starley ER 25 + 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