Mitsubishi Air Conditioner Error UH

⚡ Quick Answer: The Mitsubishi Air Conditioner error code UH indicates a communication failure between the indoor and outdoor units, often due to a current sensor abn... ✅ DIY Fixable

What Does Error UH Mean?

The Mitsubishi Air Conditioner error code UH indicates a communication failure between the indoor and outdoor units, often due to a current sensor abnormality. This issue may cause the unit to stop operating shortly after starting, leading to a loss of cooling or heating function. Signs include a blinking display and potential electrical irregularities during startup. Resolving this may require inspecting the current sensor circuitry and associated connections.

Common Symptoms:

  • Unit displays 'UH' and stops operation shortly after starting.
  • Potential loss of cooling/heating function due to safety shutdown.
  • May be accompanied by power irregularities at startup or under load.

Possible Causes

  • Current sensor abnormality in the outdoor unit (medium)
  • Abnormal voltage conditions affecting sensor readings (low)
  • Connector or wiring issue related to current sensor circuit (low)

How to Fix Error UH

DIY Fix Perform basic power reset and check power supply

  1. Turn off the air conditioner and disconnect power at the breaker.
  2. Wait 30 seconds and restore power to reset internal protections.
  3. Ensure the AC is connected to stable mains power without significant voltage fluctuation.
  4. Attempt to restart the unit to see if the error persists.

Technician Only Inspect current sensor circuitry and associated wiring

  1. Use official service tools to read detailed fault logs if available.
  2. Inspect current sensor and its connectors for signs of damage or poor connection.
  3. Test voltage supply consistency and look for irregular voltage that may affect sensor readings.
  4. Replace faulty sensor or repair wiring as indicated by diagnostic results.

Parts needed: Current sensor assembly, Wiring harness or connectors

🛑 When to Call a Pro:
  • If the UH error reoccurs after a power reset
  • If there are signs of electrical damage, burning smell, or unusual noises
  • If the unit does not operate normally after basic user-level steps

Technical Specifications

wattage N/A
component Communication Cable
resistance N/A
part_number Mitsubishi part number 1000A12345
voltage_rating 230V AC

Common Questions

What does UH error mean on Mitsubishi Air Conditioner?

The UH error indicates a communication failure between units due to a current sensor issue, often resulting in the unit stopping shortly after starting.

Can I fix Mitsubishi Air Conditioner UH error myself?

Yes, you can perform a basic power reset and check the power supply to see if it resolves the issue.

How much does it cost to fix UH error?

The estimated repair cost for the UH error ranges from ¥15,000 to ¥50,000, depending on the model and region.

When should I call a technician for UH?

Call a technician if the UH error reoccurs after a power reset, or if you notice electrical damage, unusual smells, or noises.

Sources & References

Data last verified: 2026-07-07

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