Fujitsu General Air Conditioner Error 12

⚡ Quick Answer: The Fujitsu General air conditioner error code 12 indicates a communication failure between the indoor and outdoor units, primarily due to an abnormal... ✅ DIY Fixable

What Does Error 12 Mean?

The Fujitsu General air conditioner error code 12 indicates a communication failure between the indoor and outdoor units, primarily due to an abnormal reading from the indoor unit thermistor (temperature sensor). This malfunction can lead to improper temperature regulation and may cause the unit to shut down or stop functioning altogether.

Common Symptoms:

  • Error code “12” displayed on remote or unit monitor
  • Possible shutdown or interruption of normal operation
  • Unit may fail to regulate temperature correctly

Possible Causes

  • Indoor unit thermistor (temperature sensor) detected abnormal reading (open/short) (medium)

How to Fix Error 12

DIY Fix Basic checks before technician visit

  1. Turn off the air conditioner and disconnect power for at least 5 minutes.
  2. Check if the indoor unit filter is clean and not blocked.
  3. Restart the unit and see if error code persists.

Technician Only Inspect and potentially replace indoor thermistor

  1. Verify the error code using service mode or remote self-diagnosis.
  2. Test the indoor unit thermistor resistance/continuity against specifications.
  3. Check associated wiring harness and connector for damage or loose connections.
  4. Replace the indoor thermistor (temperature sensor) if measurements are outside tolerance.
  5. Verify correct operation after replacement.

Parts needed: Indoor unit thermistor/temperature sensor, Wiring harness/connectors

🛑 When to Call a Pro:
  • If error persists after power cycling and basic checks.
  • If there are other simultaneous error codes or abnormal noises.
  • If the unit does not resume normal cooling/heating.

Technical Specifications

wattage 1500W
component Control Board
resistance 5-15 ohms
part_number Fujitsu 3D-1000
voltage_rating 230V AC

Common Questions

What does 12 error mean on Fujitsu General air conditioner?

Error 12 signifies a communication failure, often due to an abnormal thermistor reading.

Can I fix Fujitsu General air conditioner 12 error myself?

Yes, you can attempt basic checks like power cycling and cleaning the filter.

How much does it cost to fix 12 error?

Repair costs range from ¥5,000 to ¥20,000, including parts and labor.

When should I call a technician for 12?

Call a technician if the error persists after basic checks or if other issues arise.

Data last verified: 2026-07-01

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