Daikin Air Conditioner Error H3-00

⚡ Quick Answer: The Daikin Air Conditioner H3-00 error indicates a communication failure between the indoor and outdoor units, often resulting in the unit shutting do... ⚠️ Difficulty Varies

What Does Error H3-00 Mean?

The Daikin Air Conditioner H3-00 error indicates a communication failure between the indoor and outdoor units, often resulting in the unit shutting down and displaying the error. This can be caused by a malfunctioning high-pressure switch, wiring issues in the high-pressure circuit, or faults in the outdoor unit's control board. If this error persists, it can prevent normal cooling or heating operations.

Common Symptoms:

  • Outdoor unit protection trip and system shutdown at stop/initialization
  • Unit may stop running and display the code on the remote or LED panel
  • No normal cooling/heating operation when the code persists

Possible Causes

  • High‑pressure switch malfunction or no continuity (medium)
  • Connector or harness wiring issues related to high‑pressure switch circuit (medium)
  • Outdoor unit control/PCB related fault causing misread or absence of switch signal (medium)

How to Fix Error H3-00

DIY Fix Basic reset attempt and observation

  1. Turn off the air conditioner using the remote and main power breaker.
  2. Wait for at least 1 minute before restoring power.
  3. Restart the unit and check if the error persists.

Technician Only Professional diagnosis and repair of high‑pressure circuit

  1. Use service tools to verify continuity of the high‑pressure switch and related wiring harness.
  2. Check connector integrity between the high‑pressure switch and outdoor control PCB.
  3. Test or replace the high‑pressure switch if continuity is absent.
  4. Evaluate outdoor unit control board (PCB) for proper detection circuitry.
  5. Replace damaged control board or wiring as needed.

Parts needed: High‑pressure switch (HPS), Outdoor unit wiring harness and connectors, Outdoor control PCB

🛑 When to Call a Pro:
  • If the error persists after reset attempts
  • If there are unusual noises or visible wiring damage
  • If breaker trips repeatedly or unit won’t restart

Technical Specifications

wattage N/A
component Communication Control Board
resistance N/A
part_number DAIKIN 4B202A
voltage_rating 220V AC

Common Questions

What does H3-00 error mean on Daikin Air Conditioner?

H3-00 indicates a communication failure between the indoor and outdoor units, often causing system shutdown.

Can I fix Daikin Air Conditioner H3-00 error myself?

You can attempt a basic reset by turning off the unit and power, waiting a minute, then restarting.

How much does it cost to fix H3-00 error?

The estimated repair cost ranges from ¥20,000 to ¥60,000+, depending on parts and labor.

When should I call a technician for H3-00?

Call a technician if the error persists after a reset, if you hear unusual noises, or if the breaker trips repeatedly.

Data last verified: 2026-07-07

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