Daikin Air Conditioner Error H3

⚡ Quick Answer: The Daikin Air Conditioner H3 error indicates a high-pressure switch malfunction in the outdoor unit, often caused by compressor overheating. This iss... ✅ DIY Fixable

What Does Error H3 Mean?

The Daikin Air Conditioner H3 error indicates a high-pressure switch malfunction in the outdoor unit, often caused by compressor overheating. This issue can result in the unit stopping operation, failing to start, or shutting down unexpectedly. Unusual sounds may accompany this error, signaling a need for immediate attention to avoid potential damage.

Common Symptoms:

  • Unit stops operating
  • Unit fails to start or shuts down after running
  • High‑pressure safety trip detected

Possible Causes

  • High‑pressure pressure switch failure or open‑circuit condition (high)
  • High‑pressure switch connector or harness issue (medium)
  • Outdoor unit control board (PCB) related fault (medium)

How to Fix Error H3

DIY Fix Power Cycle and Basic Visual Check

  1. Turn off the AC unit using the remote.
  2. Switch off the dedicated circuit breaker for the AC outdoor unit.
  3. Wait about 1 minute.
  4. Turn the breaker back on and restart the AC.
  5. Observe if the H3 code reappears.

Technician Only Diagnose and Repair High‑Pressure Switch Circuit

  1. Disconnect power and access outdoor unit high‑pressure switch and associated harness.
  2. Check continuity of the high‑pressure switch with a multimeter in stopped state.
  3. Inspect connectors and harness for corrosion, loose pins, or breaks.
  4. If the switch is faulty, replace high‑pressure switch.
  5. If switch tests good but open‑circuit is still present, check outdoor PCB inputs and replace PCB if required.

Parts needed: High‑pressure pressure switch, Outdoor unit harness/connector, Outdoor control PCB

🛑 When to Call a Pro:
  • If the error persists after power cycling
  • If the unit repeatedly shuts down with H3
  • If you detect loose/wet wiring or physical damage to outdoor unit

Technical Specifications

wattage 2000W
component Compressor
resistance 5-10 ohms
part_number DAIKIN 4E100A
voltage_rating 230V AC

Common Questions

What does H3 error mean on Daikin Air Conditioner?

The H3 error indicates a high-pressure switch malfunction, causing the unit to stop or shut down.

Can I fix Daikin Air Conditioner H3 error myself?

Yes, you can try power cycling the unit and performing a basic visual check for issues.

How much does it cost to fix H3 error?

Repair costs range from ¥20,000 to ¥80,000+, depending on parts and labor.

When should I call a technician for H3?

Call a technician if the error persists after power cycling or if you notice damage to wiring.

Sources & References

Data last verified: 2026-07-01

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