Your Panasonic aircon is showing an error code, or you suspect a fault but no code is displayed. You need to know three things: how to retrieve the code from your remote, what the code means, and whether you can fix it yourself or need to call a technician.
This guide answers all three. At Lion City Aircon, we’ve serviced over 22,000 aircon units across Singapore since 2016, including thousands of Panasonic inverter splits. This page is based on official Panasonic documentation cross-checked against what we actually see in real Singapore homes.
Jump to your section:
- How to Retrieve Your Panasonic Error Code
- Quick Reference Table
- Detailed Error Code Sections
- Repair Cost in Singapore
- Frequently Asked Questions
Quick Answer: What Does the Panasonic F91 Error Code Mean?
Panasonic error code F91 means a refrigerant cycle abnormality. The system is not circulating refrigerant normally, most often because the gas is low from a leak, sometimes a compressor or sensor fault. It is high severity: running the unit like this risks the compressor, so switch it off and book a pressure test rather than just topping up the gas. The full Panasonic code list is below.
How to Retrieve Your Panasonic Error Code
Panasonic inverter aircons have a built-in Self-Diagnosis Function. When something goes wrong, the unit stores an error code that you can retrieve through the remote control or through the Panasonic Comfort Cloud app.
Using the Remote Control
- Point the remote control at the indoor unit.
- Press and hold the CHECK button for 5 seconds using a pointed object like a pin. The CHECK button is recessed on most Panasonic remotes.
- The remote display will show “- -” (two dashes), indicating it has entered diagnosis mode.
- Press the TIMER up or down arrow buttons repeatedly to cycle through possible error codes. Each press transmits a code to the indoor unit.
- When the indoor unit beeps, the code displayed on the remote at that moment matches the actual error stored in the unit. Write it down.
- To exit diagnosis mode, press the CHECK button again or wait for the remote to time out.
Using the Panasonic Comfort Cloud App
For Wi-Fi connected Panasonic models (with the CZ-TACG1 adapter or built-in Wi-Fi):
- Open the Comfort Cloud app on your phone.
- Tap the notification icon (the “i” symbol) in the top-left corner.
- Navigate to the Error Messages section.
- Any active error codes display along with timestamps.
If You Can’t Get a Code to Display
- Change the remote batteries. Weak batteries can prevent the CHECK signal from reaching the unit.
- Point the remote directly at the receiver (usually the front panel, near the display LEDs).
- Make sure you held CHECK for the full 5 seconds. Tapping it briefly does nothing.
- Listen carefully for the beep. It’s quiet and easy to miss in a noisy room.
- If still no code displays, the indoor PCB or remote receiver may be faulty.
How to Read a Panasonic Error Code
Panasonic codes are three-character alphanumeric codes. The first letter tells you the fault category:
- H codes: Hardware faults (sensors, fan motors, communication, pressure)
- F codes: Functional or system faults (compressor, refrigerant cycle, electrical protection)
Higher numbers within each series generally indicate more serious or specialised faults. For example, H11 (communication) is more common and usually less severe than F97 (compressor overheating).
Quick Reference Table: Panasonic Error Codes
| Code | What it Means | Severity |
|---|---|---|
| H00 | No memory of failure | Low |
| H11 | Indoor / Outdoor abnormal communication | High |
| H12 | Indoor unit capacity unmatched | High |
| H14 | Indoor intake air temperature sensor abnormality | Medium |
| H15 | Compressor temperature sensor abnormality | High |
| H16 | Outdoor current transformer abnormality | High |
| H17 | Outdoor suction temperature sensor abnormality | Medium |
| H19 | Indoor fan motor mechanism lock | High |
| H21 | Indoor float switch operation abnormality | Medium |
| H23 | Indoor heat exchanger temperature sensor 1 abnormality | Medium |
| H24 | Indoor heat exchanger temperature sensor 2 abnormality | Medium |
| H25 | Indoor ion device abnormality | Low |
| H26 | Minus ION abnormality | Low |
| H27 | Outdoor air temperature sensor abnormality | Medium |
| H28 | Outdoor heat exchanger temperature sensor 1 abnormality | Medium |
| H30 | Outdoor discharge pipe temperature sensor abnormality | Medium |
| H32 | Outdoor heat exchanger temperature sensor 2 abnormality | Medium |
| H33 | Indoor / outdoor misconnection abnormality | High |
| H34 | Outdoor heat sink temperature sensor abnormality | Medium |
| H35 | Indoor / outdoor water adverse current abnormality | High |
| H36 | Outdoor gas pipe temperature sensor abnormality | Medium |
| H37 | Outdoor liquid pipe temperature sensor abnormality | Medium |
| H38 | Indoor / outdoor mismatch (brand code) | High |
| H39 | Abnormal indoor operating unit or standby units | Medium |
| H41 | Abnormal wiring or piping connection | High |
| H50 | Ventilation fan motor locked | High |
| H51 | Ventilation fan motor locked | High |
| H52 | Left-right limit switch fixing abnormality | Low |
| H58 | Indoor gas sensor abnormality | Medium |
| H59 | Eco sensor abnormality | Low |
| H64 | Outdoor high pressure sensor abnormality | High |
| H67 | nanoe™ abnormality | Low |
| H70 | Light sensor abnormality | Low |
| H71 | DC cooling fan inside control board abnormality | High |
| H72 | Tank temperature sensor abnormality | Medium |
| H79 | Wireless LAN module write error | Low |
| H85 | Abnormal communication between indoor and wireless LAN module | Low |
| H97 | Outdoor fan motor mechanism lock | High |
| H98 | Indoor high-pressure protection | High |
| H99 | Indoor operating unit freeze protection | Medium |
| F11 | 4-way valve switching abnormality | High |
| F16 | Total running current protection | High |
| F17 | Indoor standby units freezing abnormality | Medium |
| F18 | Dry circuit blocked abnormality | Medium |
| F87 | Control box overheat protection | High |
| F90 | PFC circuit protection / compressor microcomputer communication error | High |
| F91 | Refrigerant cycle abnormality | High |
| F93 | Compressor abnormal revolution | High |
| F94 | Compressor discharge pressure protection | High |
| F95 | Outdoor cooling high pressure protection | High |
| F96 | Power transistor module overheating protection | High |
| F97 | Compressor overheating protection | High |
| F98 | Total running current protection | High |
| F99 | Outdoor direct current (DC) peak detection | High |
Communication and Setup Errors (H00-H12)
H00: No Memory of Failure
This isn’t really a fault. It means the diagnosis function couldn’t find any stored errors in memory. If you’re seeing H00 when you suspect a problem, the issue may have occurred too briefly to be logged, or the unit has been power-cycled and the log was cleared. Run the aircon and try the diagnosis again when symptoms appear.
H11: Indoor and Outdoor Unit Communication Error
One of the most common Panasonic codes we attend in Singapore. The indoor and outdoor units can’t communicate. Common causes: damaged signal wiring, loose connections at the terminal block, outdoor unit power off, or a defective PCB on either end. First check we always do: confirm the outdoor unit isolator is on. After that, inspect the 4-core signal cable between indoor and outdoor. Often a connection has worked loose or insulation has degraded.
H12: Indoor Unit Capacity Unmatched
The indoor unit’s capacity (BTU rating) doesn’t match what the outdoor unit expects. This usually appears after a recent installation, replacement, or after a PCB has been swapped without setting the correct capacity. Needs a technician to verify the system pairing and reconfigure if needed.
Sensor Errors (H14-H37)
Most H14-H37 codes are temperature sensor (thermistor) faults. They share a common fix pattern: identify which sensor, check the connector, replace if defective. Most are cheap fixes (parts under $80, repair from $130).
H14: Indoor Intake Air Temperature Sensor
The sensor reading air temperature at the intake of the indoor unit is faulty. The unit may still cool but can’t accurately modulate based on room temperature. Common in units over 5 years old.
H15: Compressor Temperature Sensor
The thermistor monitoring compressor temperature has failed. Important because it prevents compressor damage from overheating. Replace promptly.
H16: Outdoor Current Transformer
The current transformer measuring compressor input current is faulty. Can cause incorrect protection trips or compressor performance issues.
H17: Outdoor Suction Temperature Sensor
The thermistor on the outdoor suction line is faulty. Cheap fix.
H19: Indoor Fan Motor Mechanism Lock
The indoor fan motor is mechanically locked or jammed. Common causes: bearing failure, foreign object caught in the fan, or fan wheel imbalance. Sometimes the fan motor itself has failed. Fan motor replacement runs $200 to $350.
H21: Indoor Float Switch Operation
The drain pan float switch has detected water buildup. The drain pipe is blocked or the drain pump (in cassette units) has failed. The unit shuts off cooling to prevent overflow. Common in Singapore. A proper drain pipe vacuum usually clears H21 immediately. See our water leak guide for full breakdown.
H23: Indoor Heat Exchanger Temperature Sensor 1
The first thermistor on the indoor heat exchanger coil is faulty. Replacement.
H24: Indoor Heat Exchanger Temperature Sensor 2
Same as H23 but the second sensor location on the coil. Replacement.
H25: Indoor Ion Device Abnormality
The ionizer device (in models with built-in air purification) has failed. Cosmetic-level. The unit still cools normally; just the ionizer function is offline.
H26: Minus ION Abnormality
Similar to H25 but specifically for the negative ion generator. Cosmetic-level.
H27: Outdoor Air Temperature Sensor
The outdoor ambient air temperature sensor is faulty. Less critical for operation but worth replacing.
H28: Outdoor Heat Exchanger Temperature Sensor 1
The first thermistor on the outdoor coil is faulty. Replacement.
H30: Outdoor Discharge Pipe Temperature Sensor
The discharge pipe thermistor on the outdoor unit is faulty. Important sensor because it protects against compressor overheating. Replace promptly.
H32: Outdoor Heat Exchanger Temperature Sensor 2
Same as H28 but the second sensor location. Replacement.
H33: Indoor and Outdoor Misconnection
The indoor and outdoor units are not properly matched in terms of refrigerant or capacity. Usually appears after a faulty installation or after someone has tried to pair mismatched units. Needs technician to verify the installation matches Panasonic’s specs.
H34: Outdoor Heat Sink Temperature Sensor
The thermistor monitoring the PCB heat sink is faulty. The unit can’t detect if the inverter PCB is overheating. Replacement.
H35: Indoor and Outdoor Water Adverse Current
The drainage flow is going in the wrong direction (water flowing back toward the indoor unit instead of out). Usually means the drain pipe was installed at the wrong slope, or has shifted over time. We see this on poor-quality installations and after renovations where pipes were disturbed.
H36: Outdoor Gas Pipe Temperature Sensor
The gas pipe thermistor is faulty. Replacement.
H37: Outdoor Liquid Pipe Temperature Sensor
The liquid pipe thermistor is faulty. Replacement.
System and Connection Errors (H38-H52)
H38: Indoor and Outdoor Brand Code Mismatch
The indoor and outdoor units have mismatched brand codes. Sometimes this happens when one part has been replaced with a different model. Needs technician verification.
H39: Abnormal Indoor Operating or Standby Units
For multi-split systems. One of the indoor units is in an abnormal state (either should be running but isn’t, or should be off but is active). Configuration or wiring issue.
H41: Abnormal Wiring or Piping Connection
The system has detected a wiring or piping fault. Common after installation. Inspect the unit’s connections at both ends.
H50, H51: Ventilation Fan Motor Locked
The ventilation fan motor (in ERV-equipped models) is locked. Mechanical fault. Less common in standard Singapore residential models.
H52: Left-Right Limit Switch Fixing
The horizontal louvre limit switch is faulty. Cosmetic-level. The unit still cools but the louvre may not move correctly.
Sensor and Diagnostic Errors (H58-H85)
H58: Indoor Gas Sensor
The indoor refrigerant leak detection sensor has failed (in models equipped with leak detection). Replacement.
H59: Eco Sensor
The Eco-sensor (occupancy/activity detection) has failed. Cosmetic; the unit cools normally without it.
H64: Outdoor High Pressure Sensor
The high pressure sensor is faulty. Important for protection. Replacement.
H67: nanoe™ Abnormality
The nanoe™ air purification system has failed. Cosmetic-level on cooling performance.
H70: Light Sensor
The ambient light sensor has failed. Used for auto-dimming features. Cosmetic-level.
H71: DC Cooling Fan Inside Control Board
The small DC fan that cools the inverter PCB has failed. Important because PCB overheating can cause more expensive failures. Replace promptly.
H72: Tank Temperature Sensor
For water heater function models (less common in Singapore residential). The water tank sensor is faulty.
H79: Wireless LAN Module Write Error
The Wi-Fi module can’t write data. Cosmetic to medium; Wi-Fi features (Comfort Cloud) may not work but the unit cools normally.
H85: Indoor and Wireless LAN Module Communication
The indoor PCB can’t communicate with the Wi-Fi adapter. Cosmetic; Wi-Fi features unavailable but cooling unaffected.
Pressure and Motor Errors (H97-H99)
H97: Outdoor Fan Motor Mechanism Lock
The outdoor fan motor is mechanically locked. Common causes: bearing failure, debris caught in fan blades, or motor failure. In Singapore we sometimes find leaves, plastic bags, or even small birds caught in outdoor fans. Visual inspection first, then electrical diagnosis.
H98: Indoor High-Pressure Protection
The indoor unit detected abnormal high pressure. Often from a dirty outdoor unit (heat can’t dissipate), refrigerant overcharge, or restricted airflow. Clean the outdoor unit first.
H99: Indoor Operating Unit Freeze Protection
The unit detected risk of indoor coil freezing and shut down to prevent damage. Common causes: severely clogged air filter (most common in Singapore), low refrigerant, or restricted airflow. Clean filters first. If H99 returns, the coil needs proper cleaning or there’s a gas leak.
System Errors (F11-F18)
F11: 4-Way Valve Switching
The 4-way reversing valve (for switching between cool and heat modes on heat pump models) is faulty. Less common in Singapore where cool-only models dominate.
F16: Total Running Current Protection
The system detected total current draw exceeding safe limits. Causes: refrigerant overcharge, compressor fault, restricted airflow forcing the compressor to work harder.
F17: Indoor Standby Units Freezing
In multi-split systems, a non-operating indoor unit is freezing because of refrigerant pooling. Configuration or expansion valve issue.
F18: Dry Circuit Blocked
The refrigerant dryer (filter that removes moisture from refrigerant) is blocked. Needs replacement, usually as part of a system service.
Compressor and Power Errors (F87-F99)
F87 onwards are all serious. They generally affect the compressor or inverter directly. Don’t continue to run the unit if you see these codes.
F87: Control Box Overheat Protection
The outdoor unit’s control box is overheating. Often from poor ventilation around the outdoor unit (mounted too close to a wall, blocked airflow) or a failed cooling fan inside the box. Sometimes a cleaning resolves it; sometimes a fan replacement is needed.
F90: PFC Circuit Protection / Compressor Communication Error
The power factor correction circuit has tripped, or the system can’t communicate with the compressor’s microcomputer. Serious electrical fault. Inverter PCB usually needs replacement. $300 to $600.
F91: Refrigerant Cycle Abnormality
One of the most common F codes we see in Singapore. The refrigerant cycle isn’t operating normally. Often means low refrigerant (slow leak), but can also mean clogged piping or expansion valve issues. Pressure test required. Just topping up gas without finding the leak doesn’t fix it. See our gas top-up guide.
F93: Compressor Abnormal Revolution
The compressor isn’t rotating at the correct speed. May indicate compressor wear, inverter PCB fault, or refrigerant pressure issues. Diagnosis required.
F94: Compressor Discharge Pressure Protection
The compressor’s discharge pressure has exceeded safe limits. Usually from refrigerant overcharge, dirty outdoor unit, or restricted refrigerant flow.
F95: Outdoor Cooling High Pressure Protection
Similar to F94 but specifically during cooling mode. Most often from a dirty outdoor unit in Singapore. Clean the outdoor condenser first.
F96: Power Transistor Module Overheating Protection
The IGBT power transistor module in the inverter has overheated. Often from poor ventilation, dust on the heat sink, or excessive ambient temperature around the outdoor unit. Serious electrical fault if persistent.
F97: Compressor Overheating Protection
The compressor itself has overheated. Causes: low refrigerant (compressor running dry), refrigerant overcharge, or compressor wear. Switch off immediately to prevent permanent damage.
F98: Total Running Current Protection
Similar to F16. System-wide current draw exceeded safe limits.
F99: Outdoor DC Peak Detection
The outdoor inverter detected a peak DC current spike. Often points to a failing compressor or IGBT module. Serious.
What to Do When You See a Panasonic Error Code
- Retrieve the exact code using the CHECK button procedure above.
- Check the severity using the quick reference table.
- For Low severity codes (H25, H26, H52, H59, H67, H70, H79, H85, etc.): the unit still cools normally. Schedule a service when convenient.
- For Medium severity codes: book a service within the next few days.
- For High severity codes (especially F90, F97, F99): switch the aircon off and call a technician immediately.
- For H21 (drainage): stop using the aircon until cleared, otherwise water may overflow inside your home.
- WhatsApp +65 8818 5781 with a photo of the error code and your indoor unit nameplate. We can usually identify the cause before sending a team.
How Much Does Fixing a Panasonic Error Code Cost in Singapore?
Lion City Aircon pricing across Singapore (HDB, condo, landed, same rate):
- Diagnostic visit: $35 to $50 per unit
- Drain pipe vacuum (H21): from $90 per unit
- Chemical wash (for H99 from dirty coils): from $90 per unit
- Thermistor replacement (H14, H17, H23, H24, H27, H28, H30, H32, H34, H36, H37): from $130 (parts and labour)
- Capacitor replacement: from $130
- Fan motor replacement (H19, H97): $200 to $350
- Indoor PCB replacement: $250 to $450
- Outdoor PCB or inverter PCB replacement (F90, F96, F99): $300 to $600
- Gas leak repair plus recharge (F91): from $180
- Compressor replacement (F93, F97): from $750
If you’re on our annual maintenance contract, diagnostic visits are free and most thermistor and capacitor replacements are included between scheduled visits.
Frequently Asked Questions About Panasonic Error Codes
What’s the most common Panasonic error code in Singapore?
H11 (indoor-outdoor communication) is the most common, followed by H21 (drainage float switch) and F91 (refrigerant cycle). All three are diagnosable in a single visit.
Why does my Panasonic show “- -” instead of a code?
That’s diagnosis mode waiting for input. You’ve held the CHECK button for 5 seconds successfully. Now press the TIMER up or down arrow buttons repeatedly until the indoor unit beeps. The code displayed when the beep happens is your actual error.
Can I clear a Panasonic error code by switching off the aircon?
Low severity codes (H25, H67, H79 etc.) sometimes clear with a power reset. Medium and high severity codes usually return because the underlying fault is physical (sensor, motor, compressor, leak). Don’t ignore the code if it returns.
My Panasonic shows H00. Is that bad?
No. H00 means “no failure stored in memory.” If you ran the diagnosis when no fault was occurring, you’ll get H00. If you ran it after the fault stopped, the log may have already cleared. Try diagnosis again when symptoms appear.
Why does H11 keep coming back even after I reset?
H11 (communication) usually has a physical cause. Loose terminal connection, damaged signal cable, tripped outdoor isolator, or a failed PCB. A reset doesn’t fix any of those. Get the wiring checked.
Should I try to fix Panasonic codes myself?
Filter cleaning, drain pipe checks, basic power resets, and visual inspection are safe. Anything involving refrigerant (F91, F94, F95, F97), inverter components (F90, F96, F99), or PCB replacement needs a licensed technician.
How long does fixing a Panasonic error code take?
Most diagnoses take 30 to 45 minutes. Sensor replacements add 30 minutes. PCB or motor replacements take 60 to 90 minutes. Compressor replacement takes 2 to 3 hours. We carry common parts on the truck, so most fixes are complete in a single visit.
Will running my Panasonic with an error code damage it?
Depends on the severity. Low severity codes won’t cause additional damage short-term. Medium severity codes will worsen over weeks. High severity codes (especially F87, F90, F94, F96, F97, F99) can cause catastrophic damage in days or even hours if ignored.
Are Panasonic error codes the same on all models in Singapore?
The core H and F code system is consistent across Panasonic inverter splits sold in Singapore (CS-XU series, CS-Z series, CS-RU series, etc.). Some commercial models have additional codes. Standard residential split aircons use the codes covered above.
Get Your Panasonic Aircon Fixed Today
Most Panasonic error codes are diagnosable in a single visit. The longer you wait with an active fault, the more likely cascading damage develops, especially with compressor or inverter related F codes.
WhatsApp +65 8818 5781 with a photo of the error code and your outdoor unit nameplate. We diagnose remotely where possible and dispatch a team. Same-day service in most cases across Singapore. 22,000+ jobs done since 2016, 5.0★ across 1,500+ Google reviews, BizSafe Level 3 certified.
No scare tactics. No upselling. If your fix is a $130 thermistor, we’ll tell you that and price it accordingly. If it’s a serious inverter or compressor issue, we’ll show you what we found and give you honest repair-versus-replace numbers before doing anything.
WhatsApp Lion City Aircon · Call +65 8818 5781 · Book online
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