Daikin Air Conditioner Error U2-00

⚡ Quick Answer: The Daikin air conditioner U2-00 error indicates a communication failure between the indoor and outdoor units, often caused by abnormal power supply v... ✅ DIY Fixable

What Does Error U2-00 Mean?

The Daikin air conditioner U2-00 error indicates a communication failure between the indoor and outdoor units, often caused by abnormal power supply voltage. This may lead to the unit stopping operation, failing to start, or experiencing intermittent functionality. The error can occur after power interruptions or due to unstable voltage levels, requiring immediate attention to prevent further issues.

Common Symptoms:

  • Air conditioner stops operation and displays U2 code
  • Unit fails to start or runs briefly then shuts down
  • Possible lack of cooling/heating function
  • Code appears after power interruption or unstable voltage

Possible Causes

  • Inverter power supply voltage out of range (undervoltage/overvoltage) (high)
  • Unstable or disrupted mains power (e.g., transient interruption, phase loss) (medium)
  • Internal component faults affecting inverter power circuit (e.g., power unit, PCB, contactor, fan motor) (medium)

How to Fix Error U2-00

DIY Fix Check and stabilize power supply

  1. Turn off the air conditioner and disconnect from mains power.
  2. Ensure the supply voltage to the unit is within the normal operating range.
  3. Confirm there was no recent power surge or outage that could have triggered the code.

DIY Fix Restart the air conditioner

  1. Switch off the air conditioner at the breaker or unplug it.
  2. Wait at least 1–5 minutes.
  3. Restore power and attempt to restart the unit to see if the error clears.

Technician Only Inspect and repair internal power components

  1. Measure incoming supply voltage under load to confirm stability.
  2. Check inverter power unit, contactors, and PCB for faults or damage.
  3. Test fan motor and other related components for proper operation.
  4. Replace defective power conversion/control parts as identified.

Parts needed: Inverter power unit, Main PCB / control board, Contactors, Fan motor

🛑 When to Call a Pro:
  • If error persists after power stabilization and restart
  • If there are signs of electrical damage, burning smell, or repeated faults
  • If supply voltage is stable but the unit still shows U2

Technical Specifications

wattage N/A
component Control Board
resistance N/A
part_number DAIKIN 4E-1000
voltage_rating 220V AC

Common Questions

What does U2-00 error mean on daikin air conditioner?

The U2-00 error indicates a communication failure between indoor and outdoor units, often due to power supply issues.

Can I fix daikin air conditioner U2-00 error myself?

Yes, check and stabilize the power supply, then restart the unit to see if the error clears.

How much does it cost to fix U2-00 error?

Repair costs vary widely based on model and parts, typically medium to high depending on the failure.

When should I call a technician for U2-00?

Call a technician if the error persists after troubleshooting or if you notice electrical damage or repeated faults.

Data last verified: 2026-07-01

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