Panasonic Air Conditioner Error F42
⚡ Quick Answer: The Panasonic Air Conditioner F42 error code indicates a communication failure between the indoor and outdoor units, leading to operational interrupti... ✅ DIY Fixable
What Does Error F42 Mean?
The Panasonic Air Conditioner F42 error code indicates a communication failure between the indoor and outdoor units, leading to operational interruptions. This may be linked to potential faults with the temperature sensor or issues with the control PCB/board. Observing flashing display lights is common when this error occurs.
Common Symptoms:
- Error code F42 displayed on unit or remote control
- Air conditioner stops operating when F42 is displayed
Possible Causes
- Possible temperature sensor fault or PCB/board issue (unverified) (low)
How to Fix Error F42
DIY Fix Basic checks and reset
- Turn off the air conditioner using the remote.
- Disconnect power (turn off breaker) for 5–10 minutes.
- Reconnect power and restart the unit to see if F42 clears.
- Ensure indoor/outdoor unit filters and airflow are clear.
Technician Only Inspect sensors and control boards
- Check temperature sensors (thermistors) and associated wiring for continuity and proper resistance.
- Inspect indoor and outdoor unit control boards for signs of damage or loose connectors.
- Use service manual diagnostics (if available) for F42 on the specific model.
- Replace faulty sensors or control board if diagnostics confirm defects.
Parts needed: Temperature sensors, Control PCB/boards, Connectors/wiring harnesses
- Error persists after power cycling
- Unit does not respond to any user‑level troubleshooting
- There are signs of electrical damage (burnt smell, smoke, unusual noises)
Next step
Choose the next step for F42
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
Temperature Sensor
Monitors the internal temperature to ensure correct operation and prevent overheating.
- 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 components that may be involved
Check these only if your diagnosis points to them.
HVAC Control Board
Controls fan, compressor, sensor, and communication functions in the HVAC unit.
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Technical Specifications
| wattage | 1500W |
|---|---|
| component | Control Board |
| resistance | 5-15 ohms |
| part_number | PZ-2A |
| voltage_rating | 220V AC |
Common Questions
What does F42 error mean on Panasonic Air Conditioner?
F42 indicates a communication failure between the indoor and outdoor units, often causing the unit to stop operating.
Can I fix Panasonic Air Conditioner F42 error myself?
Yes, you can attempt basic checks and reset the unit by turning it off and disconnecting power for a few minutes.
How much does it cost to fix F42 error?
Repair costs for the F42 error can range from ¥10,000 to ¥60,000+, depending on parts and labor.
When should I call a technician for F42?
Call a technician if the error persists after power cycling, the unit is unresponsive, or if you notice electrical damage.
Data last verified: 2026-07-22
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