E01
FAULT CODE
Sime
Ignition Failure
High Severity
Engineer Required
The boiler has failed to ignite. This is the most common Sime fault code.
Cold Weather Note
Frozen condensate pipes very commonly cause E01 in winter.
Step-by-Step Fix Guide
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Step 1
Check gas supply — are other gas appliances working?
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Step 2
In cold weather, check the condensate pipe for ice
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Step 3 Engineer only
Reset once — if it returns, call a Gas Safe engineer
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.