What does the Johnson Starley E01 fault code mean?

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.

How much does it cost to fix Johnson Starley error code E01?

Typical repair cost for the Johnson Starley E01 fault is £120-£350 including labour.

Check if other gas appliances, like your hob, are working to ensure you have a gas supply.

Ignition failure

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Lockout fault with a reset-needed pattern.

Almost always a stuck diverter valve on combis.

Older boilers — thermocouple, draught, gas supply.