E03
Immergas
Flue/Fan Safety Lockout
Boiler shows E03, flue or fan fault, no ignition.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Fan failure, Blocked flue, Faulty air pressure switch, Blocked venturi
How to Fix / Troubleshooting
Safety: Risk of CO if flue is compromised. Only an engineer should work on this.
- Check terminal for blockage.
- Engineer: Test fan, pressure switch, and flue integrity; replace faulty parts.
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Repair Difficulty
Professional Required
5/5
Required Part
Air Pressure Switch
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