E01
FAULT CODE
Johnson & Starley
Ignition Lockout
Medium Severity
DIY Check Possible
The most common Johnson & Starley fault. The boiler has failed to ignite after multiple attempts. Displayed as a flame icon with lockout on display models.
Cold Weather Note
E01 in winter on Johnson & Starley boilers is commonly caused by a frozen condensate pipe.
Step-by-Step Fix Guide
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Step 1
Check gas supply - try other gas appliances
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Step 2
In cold weather, check the condensate pipe for freezing and thaw with warm water
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Step 3
Press the reset button
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Step 4
If fault persists, call a Gas Safe engineer to check 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.