Daikin Air Conditioner Error H8

⚡ Quick Answer: The Daikin Air Conditioner H8 error code indicates a communication failure between the indoor and outdoor units, specifically related to the compresso... ⚠️ Difficulty Varies

What Does Error H8 Mean?

The Daikin Air Conditioner H8 error code indicates a communication failure between the indoor and outdoor units, specifically related to the compressor. This results in the input current not rising as expected, causing the unit to stop operating. Symptoms include the unit shutting down shortly after starting, the compressor failing to run, and the H8 error being displayed on the unit or remote control. Possible causes range from issues with the current transformer to faulty compressor components.

Common Symptoms:

  • Unit stops soon after start
  • Compressor does not engage or run
  • Error H8 displayed on unit/remote

Possible Causes

  • Compressor input current not rising (CT/current transformer system abnormality) (high)
  • Faulty compressor control/interfacing components (PCB/transistor/reactor) (medium)
  • Compressor hardware failure (medium)

How to Fix Error H8

DIY Fix Basic Reset and Check

  1. Stop the air conditioner operation.
  2. Turn off the dedicated breaker or unplug the unit for ~1 minute.
  3. Restore power and retry operation.

Technician Only Outdoor Unit Electrical and Compressor Diagnosis

  1. Measure compressor starting current and verify CT sensor operation.
  2. Inspect outdoor unit PCB, power transistors, and reactor for faults.
  3. Test compressor windings and mechanical function.
  4. Repair or replace defective components (PCB, transistor, reactor, or compressor).

Parts needed: Current transformer/CT sensor, Outdoor unit PCB/control board, Power transistor module, Reactor/L-C components, Compressor unit

🛑 When to Call a Pro:
  • If error persists after basic reset
  • If the compressor doesn’t start or unusual noises are present
  • If breaker trips or electrical smells occur

Technical Specifications

wattage
component Communication Cable
resistance 0.5 ohms per meter
part_number DAIKIN 4C-1.5MM2
voltage_rating 220V AC

Common Questions

What does H8 error mean on Daikin Air Conditioner?

H8 indicates a communication failure between units, causing the compressor input current to not rise, leading to unit shutdown.

Can I fix Daikin Air Conditioner H8 error myself?

Yes, you can attempt a basic reset by turning off the power for a minute and then restoring it.

How much does it cost to fix H8 error?

Repair costs range from ¥20,000 to ¥120,000+, depending on parts and labor.

When should I call a technician for H8?

Call a technician if the error persists after a reset, if the compressor doesn’t start, or if you hear unusual noises.

Sources & References

Data last verified: 2026-07-07

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