Daikin E3 error code

What it means

E3 means the high-pressure switch opened or the system detected that circuit abnormally. Airflow can contribute, but pressure-switch diagnosis is professional work.

Urgency

Likely causes

1. Dirty filters, blocked coil airflow, or an outdoor clearance problem increasing pressure or temperature
2. Low charge, overcharge, leak, or refrigerant-flow restriction
3. Discharge, pressure, or refrigerant sensor reading outside range
4. Compressor, valve, or outdoor board issue after airflow and charge are verified

Homeowner fix

Turn the unit off, clean indoor filters, and clear only loose debris around the outdoor unit. Restart once. Do not attach gauges, adjust valves, or add refrigerant.

When to call a pro

Call a licensed HVAC technician if E3 returns. Tell them the code is high-pressure switch actuation.

Repair vs replace

This is normally repairable, but it is not a homeowner repair. If the unit is older, out of warranty, or a technician quotes a major compressor, inverter, board, or sealed-system repair, compare the quote with replacement.

• Daikin AURORA 9,000 BTU R-32 208/230V (FTXV09AVJU9 / RXT09AVJU9)

  AURORA R-32

• Daikin AURORA 12,000 BTU R-32 208/230V (FTXV12AVJU9 / RXT12AVJU9)

  AURORA R-32

• Daikin AURORA 15,000 BTU R-32 208/230V (FTXV15AVJU9 / RXT15AVJU9)

  AURORA R-32

• Daikin AURORA 18,000 BTU R-32 208/230V (FTXV18AVJU9 / RXT18AVJU9)

  AURORA R-32

Parts for this line

The parts catalog for Daikin AURORA R-32 lists 7 sourced replacement parts for this product line.

For your technician

Technician note: check airflow, high-pressure switch, refrigerant charge/restrictions, service valves, wiring, and PCB input. Page context: Daikin maps this display to the AURORA R-32 line; source: Daikin Nineteen, ATMOSPHERA, Entra, and MXM/MXT/MXTH local service manuals; display convention: match the letter E and three marker exactly before comparing neighboring codes.

Which systems show it

• Daikin current US residential R-32 ductless single-zone systems, including AURORA R-32, ATMOSPHERA R-32, Entra R32, OTERRA R-32, and Nineteen-series style high-wall diagnostics where the same Daikin A/C/E/F/H/J/L/P/U code family is used.
• Daikin concealed-duct/FDMQ indoor units where the Nineteen service manual explicitly lists the same indoor drain, fan PCB, remote-controller, and FDMQ-only C/U codes.
• Daikin AURORA Multi R-32 and Standard Multi R-32 MXT/MXTH/MXM systems where the MXM engineering manual lists the same homeowner code table.
• MXM/MXT/MXTH multi-zone systems for the additional multi-zone U-series and inverter/control codes specifically called out from the MXM manual.

Related troubleshooting

Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.

Reset note

Turn the unit off, clean indoor filters, and clear only loose debris around the outdoor unit. Restart once. Do not attach gauges, adjust valves, or add refrigerant.

Manual trigger

E3 means the high-pressure switch opened or the system detected that circuit abnormally. Airflow can contribute, but pressure-switch diagnosis is professional work.

Related codes

Source

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