What does the Keston E01 fault code mean?

Your boiler is not firing up to provide heat or hot water because it is having trouble starting the flame.

How much does it cost to fix Keston error code E01?

Typical repair cost for the Keston E01 fault is £100-£350 including labour.

Check that your gas meter is topped up with credit

Ignition failure – the boiler has attempted to light 5 times and not succeeded – check the gas supply is on

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

Almost always a stuck diverter valve on combis.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.