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
- Power cycle the air conditioner by turning off at the breaker or unplugging for several minutes, then restore power and re‑check error code
- Check and clean air filters and ensure indoor unit air intake is not blocked
- Confirm remote control temperature sensor is not covered or obstructed
Technician Only Thermistor Circuit and Sensor Inspection
- Use a multimeter to check resistance of the indoor unit temperature sensors (thermistors) against expected values
- Inspect sensor wiring harness for open circuits, shorts, or poor connections
- Replace the indoor unit thermistor(s) if out of specification
- 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)
- 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
Next step
Choose the next step for 24
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
Thermistor
Measures precise temperature changes and sends resistance feedback to the control board.
- Typical part-only price
- $15 - $35
- DIY difficulty
- Easy
- Estimated time
- 15-30 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.
Wiring Harness
Connects controls, sensors, motors, and other electrical components inside the appliance.
HVAC Control Board
Controls fan, compressor, sensor, and communication functions in the HVAC unit.
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 | 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: 2026-07-25
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