BoilerFaultCodesJohnson Starley E01 Fault Code
The Johnson Starley E01 fault code means: your boiler has failed to light the gas flame after several attempts, meaning it cannot provide you with any heating or hot water until reset.. It appears on 12 Johnson Starley models in our database.
Technical description: Ignition failure
DIY fix possible
Check if other gas appliances, like your hob, are working to ensure you have a gas supply.Check that your gas meter has credit if you are on a prepay system.Press and hold the reset button for five seconds to see if the boiler restarts.
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Gas Safe Register →Johnson Starley models that show the E01 fault code
Click a model for the full fault code list and model-specific repair notes.
- C10d Repair: £120-350
- C16d Repair: £100-£280
- C16u Repair: £120-£350
- C26d Repair: £100-£350
- Comet 100 Repair: £120-350
- Comet 60 Repair: £100-280
- Comet 80 Repair: £120-350
- J32 System ET Repair: £120-£350
- Optima E20 Repair: £100-300
- Warmaflow F80E Repair: £90-280
- Warmaheat Repair: £100-280
- Warmcair DW Repair: £120-£350
Source
Johnson Starley E01 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