Your Panasonic air conditioner has a handy self-diagnosis function. When something isn’t right, it will display an error code (on the remote, indoor unit, or via LEDs). These codes are clues telling you what is wrong so you can either fix it yourself if it’s simple, or give a technician the right info.
How Self-Diagnosis / Error Codes Work
- Panasonic inverter ACs have built-in diagnostic logic that monitors sensors (temperature, current, pressure, etc.), fan motors, communication between indoor & outdoor units, etc.
- When the system detects an abnormality, it lights up a “Check” LED or shows a code on the remote or via the app (e.g. Panasonic Comfort Cloud) so you know which part is having trouble.
- Codes often are grouped by type: “H-codes” often related to sensors, communication, safety; “F-codes” usually protection, overheating, pressure problems; others like “E”, “S” etc.
Complete List of Panasonic AC Error Codes & What They Mean
Here’s a detailed list of Panasonic error codes for domestic inverter / split / multi-split ACs (most models). Note: some codes may not apply to all units. Always check your model’s manual. Sources: Panasonic self-diagnosis info; installation & service manuals.
| Code | Description | What Likely Caused It / What to Inspect |
|---|---|---|
| H00 | No issues detected / Normal operation | Nothing wrong, major sensors & comms are OK. |
| H11 | Indoor/outdoor abnormal communication | Loose wires, broken communication cable, defective PCB (indoor or outdoor). |
| H12 | Indoor unit capacity mismatched / connection capability abnormal | Possibly wrong combination of indoor units or incorrect configuration; wiring mismatch. |
| H14 | Indoor intake (room) air temperature sensor abnormal | Sensor open/short; connector loose; sensor failure. |
| H15 | Compressor (outdoor) temperature sensor abnormal | Disconnected / shorted sensor; wiring, or sensor has failed. |
| H16 | Outdoor current transformer open circuit / IPM or power transistor module issue | Could mean low or no current measurement; freon low; or power module failing. |
| H17 | Outdoor suction pipe temperature sensor abnormal | Same ideas: sensor wiring, connector, the thermistor itself. |
| H19 | Indoor fan motor mechanism locked | Fan stuck; motor bearings bad; PCB not driving properly. |
| H21 | Drainage blocked or float sensor defective | Water drain blocked; float switch or sensor defective; condensate pump problem. |
| H23 / H24 | Indoor heat exchanger temperature sensor (variants) abnormal | Sensor open / short; sensor disconnected; temperature readings off. |
| H25 | Defective ionization unit or internal board issue | Ionizer (if equipped) failing; or indoor board (control electronics) faulty. |
| H26 | Ionizer malfunction | Same as above. |
| H27 | Outdoor intake air temperature sensor abnormal | Sensor problem outside unit; check wiring, environmental exposure. |
| H28 | Outdoor heat exchanger temperature sensor N1 abnormal | Sensor wiring, connector; possibly heat exchanger damage or obstruction. |
| H30 | Outdoor discharge (pipe) temperature sensor abnormal | Sensor error; potential overheat; failing thermistor. |
| H32 | Temperature sensor at output of condenser abnormal | Condenser sensor fault. |
| H33 | Indoor/outdoor wrong connection (e.g. wiring or electrical supply mismatch) | Wiring mix-ups; mis-wiring between units; incorrect phases or brand code mismatch. |
| H34 | Outdoor unit heat sink temperature sensor shorted or broken | Sensor wiring; heat sink temperature reading wrong; possibly overheating. |
| H35 | Drainage blockage / pump malfunction | As for H21; also mechanical pump failures. |
| H36 | Outdoor unit gas pipe temperature sensor error | Sensor open/short; see H17 etc. |
| H37 | Outdoor unit liquid pipe temperature sensor short-circuited | Same logic. |
| H38 | Indoor/outdoor mismatch (brand code) | The indoor and outdoor units aren’t compatible or match in brand code; configuration error. |
| H39 | Wires and freon circuits mixed up / solenoid valve of outdoor unit faulty | Installation error; piping mistake; valve coil failure. |
| H41 | Inconsistency in connection of wires and refrigerant conduits | Wrong piping or wiring layout; perhaps mis-connected indoor/outdoor. |
| H50 | Defective fan motor or board (indoor) | Indoor fan motor faults; PCB drivers; maybe mechanical block or bearings. |
| H51 | Nozzle blockage (for “AC robot” or flap/nozzle mechanisms) | Blocked airflow, movement parts stuck. |
| H52 | Limit switch abnormality (movement / flap limit switch) | Flap or louvre movement problem; limit switch or motor. |
| H58 | Patrol Sensor / specialty sensor abnormality | Extra sensors like patrol, air quality, etc. malfunction. |
| H64 | High pressure sensor malfunction | Pressure sensor reading is off; could be overpressure or wiring/sensor issue. |
| H67 | nanoe™ system abnormality (ionizer / air purification module) | Fault in nanoe module. |
| H70 | Light sensor abnormality | If unit has ambient light sensor or display sensor; mis-reading or short/open. |
| H71 | DC cooling fan inside control board abnormality | Fan on board, driver circuits. |
| H72 | Tank temperature sensor abnormality | Possibly relates to condensate tank or water temperature sensor where applicable. |
| H79 | Wireless LAN module write error | For units that connect via WiFi / LAN; firmware / module communication fault. |
| H85 | Indoor ↔ Wireless LAN module communication error | As above. |
| H97 | Outdoor fan motor mechanism locked | Like H19 but for the outdoor fan; motor stuck; perhaps mechanical or wiring issue. |
| H98 | Indoor high-pressure protection / overheating in heat mode | Unit protecting itself: overpressure, dirty filters, restricted airflow, insufficient heat removal. |
| H99 | Indoor unit freeze protection / anti-freeze / evaporator freezing | Evaporator coil freezing, low refrigerant, dirty filter, poor airflow. |
| F11 | Four-way valve switching abnormality | Valve mechanism for reversing between heat & cool not switching properly. |
| F17 | Freezing of the indoor unit (including standby mode) | Indoor coil freezing; or ambient temperature low; sometimes seen when unit idle. |
| F90 | Open circuit or mismatch in compressor windings / inverter board malfunction | Compressor windings damaged; PCB or drive module issues. |
| F91 | Refrigeration cycle abnormality / low pressure protection | Could be refrigerant shortage, restriction in circuit. |
| F93 | Compressor abnormal revolution / compressor open winding / driver mismatch | Compressor not responding to the controller properly. |
| F94 | Overpressure protection (too high discharge pressure) | Condenser blocked; overcharge; restricted airflow outdoors. |
| F95 | Outdoor unit heat exchanger overheating | Ambient temperature high; condenser dirty; fan issue. |
| F96 | Overheating of the power transistor module / IPM module | Electronics unit overheating; poor cooling; repeated high load. |
| F97 | Compressor discharge temperature is too high / compressor overheating protection | Possibly low refrigerant, excessive load, failure in cooling path. |
| F98 | Protection for total current consumption / over-current protection | Electrical overload, spike, board protection kicking in. |
| F99 | DC protection system error – various causes (compressor jam, transistor module failure, current sensor issue) | Very serious; likely hardware / electrical component fault. |
How to Read / Get the Error Code on Your Panasonic
- Use the remote control: Press and hold the CHECK button (or equivalent) for ~5 seconds; remote displays “–” then cycle codes using TIMER / UP/DOWN.
- If you have the Panasonic Comfort Cloud App, check the “Error Messages” section.
- On some units, LED lights or flashing patterns (timer LED, panel LEDs) indicate a stored or current error.
Common Problems / Fix-Its Based on Code Types
Here are groups of errors by what they generally indicate, and what you can check or do.
| Type of Error | What to Check / Do |
|---|---|
| Sensor faults (e.g. H14, H15, H17, H30 etc.) | Check sensor connectors; test with multimeter for open/short; replace sensor if necessary. |
| Communication & mismatch (H11, H12, H33, H38 etc.) | Inspect communication wires between indoor/outdoor; check for loose connectors; ensure matching units; check brand codes / configuration. |
| Fan / motor lock (H19, H97 etc.) | See if fan blades rotate freely; check motor windings; inspect PCB driver; check power supply. |
| Drain / water issues (H21, H35 etc.) | Ensure condensate line is clear; float switch works; pump (if applicable) works; drain pan not overflowing. |
| Protection / safety / overheat (F94, F95, F96 etc.) | Clean condenser coils; ensure good airflow; inspect filters; check refrigerant level; check overheating protection parts like heat sink sensors. |
| Refrigerant / pressure (F91, F94, F97) | Low charge or leaks; blockage; refrigerant lines; pressure sensors; professional HVAC work (safe handling). |
| Electrical / board / inverter issues (H16, F90, F99 etc.) | Check supply voltage; power spikes; inspect PCBs; test current sensors; replace faulty modules. |
When to Call a Professional
You should contact a qualified HVAC technician when:
- The code indicates refrigerant problems (leaks, low pressure) because handling refrigerant must be done safely.
- The error is in the inverter / board / compressor (F90, F99, etc.). These are complex & sometimes expensive components.
- You see repeated overheat or protection shutdowns.
- The AC doesn’t run at all (no cooling/heating) and the code points to communication or power supply.
- The unit is still under warranty, so you don’t void warranty by DIY attempts.
Tips to Prevent Errors in Panasonic ACs
- Regular filter cleaning to maintain airflow.
- Prevent blocking or debris buildup around outdoor unit.
- Ensure installation wiring and piping are done correctly (matching units, correct sensors, no mis-piping).
- Use surge protection or ensure stable power supply.
- Periodic servicing (especially before high load seasons like summer / winter).
- Keep area around sensors clean; check sensors occasionally for dust / damage.
Conclusion
Panasonic error codes are there for your benefit—they help you detect problems early. With this guide you should be able to read the code, understand roughly what’s wrong, try basic fixes, and in many cases reduce the time or cost of repair by giving correct info to the technician.
If you’d like, I can pull up the error codes for your specific Panasonic model so it’s an exact reference (sometimes units differ a little). Also, I can create a quick-reference printable chart version of this list if that helps.
