E01
FAULT CODE
Keston
Ignition Failure — 5 Attempts
Medium Severity
DIY Check Possible
The boiler has attempted to light 5 times and failed. The most common Keston fault code.
Cold Weather Note
Keston boilers have a short internal condensate drain that can freeze quickly in cold weather. Check this first.
Step-by-Step Fix Guide
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Step 1
Check the gas supply is turned on
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Step 2
In cold weather, check for a frozen condensate pipe — Keston boilers have a plastic drain pipe that can freeze
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Step 3
Thaw the condensate pipe with warm water if frozen
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Step 4
Reset the boiler
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Step 5
If fault persists, call a Gas Safe engineer to check the ignition electrode and gas valve
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.