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

Next step

Choose the next step for H3

Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.

Based on diagnostic data

Most relevant component to inspect

HVAC Control Board

Controls fan, compressor, sensor, and communication functions in the HVAC unit.

Typical part-only price
$90 - $320
DIY difficulty
Hard
Estimated time
45-120 mins
Where can I find the model number?

Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.

Find a part that fits my model

Verify the complete model and part number on the retailer's compatibility page before ordering.

Other parts options

Check related components first; use model search as a fallback.

Model number required

Model-compatible Air Conditioner parts

Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.

Find a part that fits my model

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Optional routine care

Maintenance supplies

These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.

Maintenance supply

Air Conditioner Fin Cleaner

For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.

View maintenance supply
Maintenance supply

Model-Compatible Washable AC Filter

A reusable filter option only where the appliance supports one. Match the full model, dimensions, and filter specification.

Compatibility check required: use the complete appliance model and compare the existing filter, bag, or specification before ordering.

Find one that fits my model

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.

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: 2026-07-22

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