Daikin Air Conditioner Error UH

⚡ Quick Answer: The Daikin Air Conditioner UH error indicates a communication failure between the indoor and outdoor units, leading to a system shutdown for safety. T... ✅ DIY Fixable

What Does Error UH Mean?

The Daikin Air Conditioner UH error indicates a communication failure between the indoor and outdoor units, leading to a system shutdown for safety. This can occur due to a mismatch in unit models, faulty wiring, or control board issues. If you see this error, your AC will stop running, and the display may blink, indicating that proper communication is not established.

Common Symptoms:

  • AC stops running and displays UH error code
  • Communication between indoor and outdoor unit not established
  • System safety shutdown

Possible Causes

  • Mismatch between indoor and outdoor unit models/configuration (medium)
  • Faulty or misconnected communication wiring between indoor and outdoor units (medium)
  • Control board (indoor or outdoor) failure affecting communication/control (low)

How to Fix Error UH

DIY Fix Power cycle the air conditioner

  1. Turn off the AC using the remote or unit power button
  2. Switch off the dedicated AC breaker or unplug the unit
  3. Wait about 1 minute
  4. Restore power and attempt to restart

Technician Only Check and correct communication wiring and unit compatibility

  1. Inspect the communication cable between indoor and outdoor units for proper routing, secure connections, and continuity
  2. Verify that the indoor and outdoor units are compatible models/configured correctly
  3. Test or replace control boards if wiring and configuration are correct but the error persists
  4. Perform system test and confirm communication integrity before normal operation

Parts needed: communication wiring, indoor unit control board, outdoor unit control board

🛑 When to Call a Pro:
  • If UH error persists after power cycling
  • If there is visible damage to wiring or units
  • If incompatible unit models are suspected

Next step

Choose the next step for UH

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

Check during diagnosis

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

note The previous model-independent part specification was removed. Verify the full model number and diagnosis in the manufacturer's official parts catalog before ordering.
part_number None

Common Questions

What does UH error mean on Daikin Air Conditioner?

UH error indicates a communication failure between the indoor and outdoor units, causing the AC to stop running.

Can I fix Daikin Air Conditioner UH error myself?

Yes, you can try power cycling the AC. Turn it off, disconnect the power, wait a minute, then turn it back on.

How much does it cost to fix UH error?

Repair costs for the UH error typically range from ¥5,000 to ¥30,000+, depending on parts and labor.

When should I call a technician for UH?

Call a technician if the UH error persists after power cycling, if you see visible damage, or if unit compatibility is in question.

Data last verified: 2026-07-31

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