EA
ATAG
Air Pressure Switch Not Proving
Furnace shows EA, fan runs but no ignition, often associated with air pressure issues
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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
Blocked condensate trap or flue, Faulty air pressure switch, Incorrectly connected pressure hoses, Weak combustion fan
How to Fix / Troubleshooting
Safety first: Isolate power and gas. Condensate may be acidic; wear gloves and eye protection.
- Check the condensate trap and drain pipe for blockages or freezing. Remove the trap, clean thoroughly, and refill with clean water before refitting.
- Inspect the air pressure switch hoses for correct routing and secure fit on the fan and switch nipples.
- Test the air pressure switch with a manometer or continuity tester while the fan runs (this is typically a technician task).
- Ensure the flue system is correctly assembled and not sagging or filled with condensate.
- If the EA code persists after cleaning and hose checks, the air pressure switch or fan may need replacement by a professional.
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Repair Difficulty
Hard
4/5
Required Part
ATAG air pressure switch
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