Daikin Air Conditioner Error P9

⚡ Quick Answer: The Daikin air conditioner P9 error code indicates a communication failure between the indoor and outdoor units. This may happen during startup or tri... ✅ DIY Fixable

What Does Error P9 Mean?

The Daikin air conditioner P9 error code indicates a communication failure between the indoor and outdoor units. This may happen during startup or trial operation, often preventing the unit from functioning. In some household models equipped with a humidifier, the P9 code may also signify a malfunction of the humidifier fan motor. To resolve this issue, check your model specifications and consider performing a basic power reset.

Common Symptoms:

  • P9 displayed on controller/indoor unit panel
  • unit may stop or display code during startup/trial operation
  • humidifier function not operating (on models with humidifier)

Possible Causes

  • Trial operation (refrigerant auto charge) indication (medium)
  • Humidifier fan motor malfunction (on specific household models with humidifier) (low)

How to Fix Error P9

DIY Fix Confirm model and context of P9 code

  1. Check your specific model number and whether your unit has a humidifier option.
  2. Determine whether the code appears during initial trial operation or regular use.
  3. Consult your unit’s installation/service manual for your exact model’s code definitions (official Daikin Error Code Search).

DIY Fix Basic power reset

  1. Turn off the air conditioner using the remote or the unit’s power switch.
  2. Disconnect power at the breaker or unplug the unit for ~1 minute.
  3. Restore power and restart to see if the P9 clears (especially useful if shown in error display).

Technician Only Service inspection for possible humidifier fan issue (if applicable)

  1. Inspect humidifier fan motor and connectors on units that include humidifier function.
  2. Verify control board diagnostic data for fan motor error.
  3. Replace humidifier fan motor or related harness if confirmed defective.

Parts needed: humidifier fan motor, fan motor harness/connector

🛑 When to Call a Pro:
  • If P9 persists after basic reset and is not clearly associated with trial operation or startup sequence
  • If unit alarms or stops cooling/heating unexpectedly
  • If symptoms include abnormal noises or loss of functions like humidification

Technical Specifications

wattage N/A
component Communication Wire
resistance N/A
part_number DAIKIN 937000D
voltage_rating 230V AC

Common Questions

What does P9 error mean on daikin air conditioner?

P9 indicates a communication failure between units or a humidifier fan issue on specific models.

Can I fix daikin air conditioner P9 error myself?

Yes, check your model, perform a power reset, and consult the manual for specific code definitions.

How much does it cost to fix P9 error?

Estimated repair costs range from ¥10,000 to ¥40,000, depending on the model and region.

When should I call a technician for P9?

Call a technician if the P9 error persists after a reset or if you hear abnormal noises.

Data last verified: 2026-07-01

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