Daikin Air Conditioner Error J1

⚡ Quick Answer: The Daikin Air Conditioner error J1 indicates a communication failure between the indoor and outdoor units, often triggered by a malfunctioning high-p... ✅ DIY Fixable

What Does Error J1 Mean?

The Daikin Air Conditioner error J1 indicates a communication failure between the indoor and outdoor units, often triggered by a malfunctioning high-pressure sensor in the outdoor unit. This error results in the unit stopping operation and a blinking display, leading to a lack of cooling or heating. To ensure safety, the system has halted its operation until the issue is resolved.

Common Symptoms:

  • Unit stops operation with J1 displayed
  • Possible lack of cooling/heating
  • Error shown on controller or outdoor unit display

Possible Causes

  • Faulty high‑pressure pressure sensor (outdoor unit) (medium)
  • Sensor wiring or connection issues (high/low pressure sensor misconnection or loose harness) (medium)
  • Outdoor unit PCB (printed circuit board) fault affecting pressure sensor signaling (low)

How to Fix Error J1

DIY Fix Check basic connections and restart

  1. Turn off the air conditioner using the remote or main power switch.
  2. Wait 5–10 minutes and restart the unit to see if the error clears.
  3. Check that the outdoor unit’s power supply is stable and there are no tripped breakers.

Technician Only Inspect and repair/replace pressure sensor and wiring

  1. Disconnect power fully before inspection.
  2. Inspect high‑pressure sensor wiring and connectors for damage or loose connections.
  3. Test the high‑pressure sensor to confirm its operation; if faulty, replace the sensor.
  4. If wiring and sensor are confirmed good, test outdoor unit PCB pressure signal circuitry.

Parts needed: High‑pressure sensor, Sensor wiring harness, Outdoor unit circuit board (if needed)

🛑 When to Call a Pro:
  • If the J1 error persists after a simple power reset.
  • If you observe loose, frayed, or damaged wires around the outdoor unit sensors.
  • If the unit does not resume normal operation after professional basic inspection.

Technical Specifications

wattage 200W
component Control Board
resistance 5-15 ohms
part_number DAIKIN 4A100000000
voltage_rating 220V AC

Common Questions

What does J1 error mean on Daikin Air Conditioner?

The J1 error indicates a communication failure between indoor and outdoor units due to a high-pressure sensor malfunction.

Can I fix Daikin Air Conditioner J1 error myself?

Yes, you can try restarting the unit and checking connections. If the error persists, professional help is needed.

How much does it cost to fix J1 error?

Repair costs for the J1 error range from ¥15,000 to ¥60,000+, depending on parts and labor.

When should I call a technician for J1?

Call a technician if the J1 error persists after a reset, or if you notice damaged wires or no improvement after inspection.

Sources & References

Data last verified: 2026-07-01

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