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
- Stop the air conditioner operation.
- Turn off the dedicated breaker or unplug the unit for ~1 minute.
- Restore power and retry operation.
Technician Only Outdoor Unit Electrical and Compressor Diagnosis
- Measure compressor starting current and verify CT sensor operation.
- Inspect outdoor unit PCB, power transistors, and reactor for faults.
- Test compressor windings and mechanical function.
- 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
- If error persists after basic reset
- If the compressor doesn’t start or unusual noises are present
- If breaker trips or electrical smells occur
Next step
Choose the next step for H8
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
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.
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.
Compressor
Compresses refrigerant within the sealed cooling system and requires specialized service equipment.
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.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
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.
Air Conditioner Fin Cleaner
For routine cleaning of accessible coil fins when permitted by the manufacturer. Disconnect power and follow product and appliance instructions.
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.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
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: 2026-07-22
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