E03
Dimplex
Flue Fan / Air Pressure Switch Fault
Boiler attempts to start but shuts down with E03; fan runs briefly or not at all; possible flue or air pressure fault
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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
Failed Dimplex flue fan assembly, Blocked or restricted Dimplex concentric flue, Faulty Dimplex air pressure switch, Split or disconnected silicone tubing to air pressure switch
How to Fix / Troubleshooting
Safety first: Isolate electrical power before inspecting the boiler. Do not dismantle the flue system yourself.
What you can check:
- Flue terminal: From outside, ensure the Dimplex flue terminal is clear of obstructions (leaves, nests, snow, plastic bags). Do not insert objects into the terminal.
- Condensate drain: Check that the Dimplex condensate pipe is not frozen or blocked, as this can affect combustion and fan operation. If frozen, thaw gently with warm (not boiling) water and lag the pipe.
- Reset the boiler: After clearing any obvious blockage, reset the boiler via the control panel and observe if E03 returns.
Professional actions:
- Test the Dimplex flue fan for correct voltage and speed; replace the fan assembly if faulty.
- Check the Dimplex air pressure switch operation and tubing for splits or blockages; replace as needed.
- Verify flue integrity and correct installation according to Dimplex specifications.
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Repair Difficulty
Professional Required
5/5
Required Part
Dimplex flue fan assembly
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