Daikin Air Conditioner Error Code E3
Refrigerant pressure on the high side rose far enough to trip the safety switch, and the unit stopped to protect the compressor. A dirty or blocked outdoor coil is the classic cause, especially in hot weather.
Applies to: Residential split and multi-split systems
Common causes
- Dirty outdoor unit heat exchanger
- Defective high pressure switch
- Clogged refrigerant piping
- Defective connector contact
What to check, in order
- Switch the unit off at the breaker or isolator, wait five minutes, then switch it back on and run it again.
- If the outdoor coil is visibly clogged with leaves or dirt, brush loose debris off the outside of the grille only — do not open the casing.
- Check that nothing is blocking airflow around the outdoor unit (plants, covers, stored items) and that the fan can spin freely — look only, never reach inside.
- If the code returns after these checks, book a Daikin service engineer and tell them the code and the model name from the unit's label.
Clear the code and test
- Fix what the checks above found first — a filter cleaned, an obstruction removed, the breaker restored. Clearing the code without fixing the cause only brings it back.
- Restore power at the breaker and switch the unit on with the remote.
- Run the unit in cooling or heating for ten to fifteen minutes and watch whether the code returns; some codes only appear after the compressor has run for a while.
- If the unit runs with no code, the fault is cleared. If the code returns, write down the code and whether the indoor or outdoor unit shows it before calling a technician — it speeds up the diagnosis.
When to call a professional
Most cases are solved by the checks above. Book a technician if any of these apply:
- The code comes back after you have run the checks and a test cycle.
- You smell burning, see sparks or scorch marks, or the breaker trips.
- Water is leaking and you cannot stop it.
- The fix needs panels opened beyond what your manual describes, or a part tested with a meter, and you are not set up for that.
When you call, give the brand, the code E3, your model number (on a label on the side of the indoor unit) and the checks you already ran. It shortens the visit.
Parts that may be involved
High pressure switchOutdoor heat exchanger (coil)
Parts are model-specific. Find your model number first — usually on a label on the side of the indoor unit — and match the part to that number before ordering.
Questions people ask about E3
What does E3 mean on a Daikin air conditioner?
E3 means: High pressure switch has activated. Refrigerant pressure on the high side rose far enough to trip the safety switch, and the unit stopped to protect the compressor. A dirty or blocked outdoor coil is the classic cause, especially in hot weather.
Can I fix Daikin E3 myself?
Start yourself: the checks on this page cover the causes you can reach without opening the machine up. If they point to a faulty part, testing or replacing it is usually a technician job.
How do I clear Daikin E3?
Fix what the checks above found first — a filter cleaned, an obstruction removed, the breaker restored. Clearing the code without fixing the cause only brings it back. Restore power at the breaker and switch the unit on with the remote. Run the unit in cooling or heating for ten to fifteen minutes and watch whether the code returns; some codes only appear after the compressor has run for a while.
Sources checked
The meaning and checks for this code were checked against the sources above in November 2026. Codes vary by model and region; if your manual lists a different meaning for your exact model, follow the manual.