Fujitsu General Air Conditioner Error 24

⚡ Quick Answer: Error code 24 on your Fujitsu General air conditioner indicates a communication failure between the indoor and outdoor units, likely due to an abnorma... ✅ DIY Fixable

What Does Error 24 Mean?

Error code 24 on your Fujitsu General air conditioner indicates a communication failure between the indoor and outdoor units, likely due to an abnormality in the indoor unit thermistor (temperature sensor). This error may manifest as an unresponsive unit, unreliable temperature control, or incorrect readings, often accompanied by a blinking display or complete cooling failure.

Common Symptoms:

  • Unit stops operating with service code 24 shown on remote or lamp diagnostic display
  • Temperature control unreliable or incorrect temperature readings
  • Possible cycling or inability to maintain set temperature

Possible Causes

  • Indoor unit thermistor (temperature sensor) abnormality (medium)

How to Fix Error 24

DIY Fix Basic Checks Before Calling Technician

  1. Power cycle the air conditioner by turning off at the breaker or unplugging for several minutes, then restore power and re‑check error code
  2. Check and clean air filters and ensure indoor unit air intake is not blocked
  3. Confirm remote control temperature sensor is not covered or obstructed

Technician Only Thermistor Circuit and Sensor Inspection

  1. Use a multimeter to check resistance of the indoor unit temperature sensors (thermistors) against expected values
  2. Inspect sensor wiring harness for open circuits, shorts, or poor connections
  3. Replace the indoor unit thermistor(s) if out of specification
  4. Check indoor unit control board for possible damage if sensor wiring and thermistors are good

Parts needed: Indoor unit thermistor(s), Thermistor wiring harness, Indoor unit control board (if needed)

🛑 When to Call a Pro:
  • If error persists after power cycling and basic checks
  • If sensor wiring appears damaged or if thermistor values are out of expected range
  • If multiple error codes appear simultaneously indicating deeper control faults

Technical Specifications

wattage N/A
component Communication Cable
resistance N/A
part_number FJ-CC-24
voltage_rating 230V AC

Common Questions

What does 24 error mean on Fujitsu General air conditioner?

Error code 24 signifies a communication failure, likely due to an indoor unit thermistor issue.

Can I fix Fujitsu General air conditioner 24 error myself?

Yes, you can power cycle the unit and check filters and temperature sensor for obstructions.

How much does it cost to fix 24 error?

Repair costs can range from ¥5,000 to ¥25,000+, depending on parts and labor.

When should I call a technician for 24?

Call a technician if the error persists after basic checks or if there are multiple error codes.

Data last verified: 2026-07-01

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