What causes the F99 (Output Over Current Detection) error in Panasonic CU-E12NKD?
- JJennifer FletcherSep 23, 2025
The F99 error code indicates an Output Over Current Detection. This can be caused by a faulty outdoor unit PCB or a faulty compressor.

What causes the F99 (Output Over Current Detection) error in Panasonic CU-E12NKD?
The F99 error code indicates an Output Over Current Detection. This can be caused by a faulty outdoor unit PCB or a faulty compressor.
What does H99 error mean on my Panasonic CU-E12NKD Air Conditioner?
The H99 error code on your Panasonic Air Conditioner indicates an indoor freeze prevention protection during cooling or soft dry modes. This can be caused by several factors: an air short circuit at the indoor unit, a clogged air filter, dust accumulation on the heat exchanger, a closed 2/3 way valve, a faulty fan motor, refrigerant shortage (leakage), a clogged expansion valve or strainer, a faulty pipe temperature sensor, or a faulty indoor unit PCB.
What does error code F95 mean on a Panasonic CU-E12NKD Air Conditioner?
The F95 error code indicates a cooling high pressure abnormality. This could be due to an air short circuit at the indoor unit, dust accumulation on the indoor unit heat exchanger, a closed 2/3 way valve, a faulty outdoor unit fan motor, excessive refrigerant, a clogged expansion valve or strainer, a faulty outdoor pipe temperature sensor, or a faulty outdoor unit PCB.
Why does my Panasonic CU-E12NKD Air Conditioner show H12 (Indoor/Outdoor Capacity Rank Mismatched) error?
The H12 error code on your Panasonic Air Conditioner indicates a capacity rank mismatch between the indoor and outdoor units. This can occur due to wrong models being interconnected, incorrect indoor or outdoor unit PCBs being mounted, defective PCBs, or signal transmission errors caused by incorrect wiring or wire breakage.
What causes the F93 Compressor Rotation Failure in Panasonic CU-E12NKD Air Conditioner?
The F93 error code indicates a compressor rotation failure. This could be due to a disconnected compressor terminal, a faulty outdoor PCB, or a faulty compressor.
What does H32 error mean on my Panasonic Air Conditioner?
The H32 error code on your Panasonic Air Conditioner indicates an abnormality with the outdoor heat exchanger temperature sensor 2. This can be caused by a faulty connector connection, a faulty sensor, or a faulty PCB.
What does H28 error mean on my Panasonic CU-E12NKD?
The H28 error code on your Panasonic Air Conditioner indicates an abnormality with the outdoor pipe temperature sensor. This can be caused by a faulty connector connection, a faulty sensor, or a faulty PCB.
What does H27 error mean on my Panasonic CU-E12NKD Air Conditioner?
The H27 error code on your Panasonic Air Conditioner indicates an abnormality with the outdoor air temperature sensor. This can be caused by a faulty connector connection, a faulty sensor, or a faulty PCB.
What does F11 (4-way valve Abnormality) mean for Panasonic Air Conditioner?
The F11 error code indicates a 4-way valve abnormality. This can be caused by a connector in poor contact, a faulty sensor, a faulty outdoor unit PCB, or a defective 4-way valve.
What causes the F97 (Compressor Overheating) error in Panasonic CU-E12NKD?
The F97 error code indicates compressor overheating. This can be caused by a faulty compressor tank temperature sensor, a closed 2/3 way valve, refrigerant shortage (refrigerant leakage), a faulty outdoor unit PCB, or a faulty compressor.
| Refrigerant | R410A |
|---|---|
| Weight (Indoor Unit) | 9 kg |
| Power Supply | 220-240V, 50Hz |
| Noise Level (Outdoor) | 48 dB(A) |
| Type | Split System |
| Cooling Capacity | 3.5 kW |
| Heating Capacity | 4.00 kW |
| Outdoor Unit Dimensions (W x H x D) | 780 x 540 x 289 mm |
Identifies and describes the controls and indicators on the indoor unit.
Identifies and describes the components of the outdoor unit.
Details the layout and functions of the remote control buttons and display.
Provides detailed measurements and diagrams for the indoor unit models.
Provides detailed measurements and diagrams for the outdoor unit models.
Diagram illustrating the refrigerant flow for specific indoor/outdoor unit models.
Diagram illustrating the refrigerant flow for the CU-E18NKD model.
Block diagram showing system components for specific indoor/outdoor unit models.
Block diagram showing system components for the CU-E18NKD model.
Wiring diagrams for the indoor unit, detailing connections for various models.
Wiring diagrams for the outdoor unit, detailing connections for various models.
Electronic circuit diagrams for the indoor unit, covering different model series.
Electronic circuit diagrams for the outdoor unit, covering different model series.
Diagrams and layouts for various indoor unit printed circuit boards.
Diagrams and layouts for outdoor unit printed circuit boards.
Guidelines for choosing optimal installation spots for indoor and outdoor units.
Detailed steps for fixing the installation plate, drilling holes, and connecting cables to the indoor unit.
Procedures for installing the outdoor unit, connecting piping, evacuation, and insulation.
Covers fundamental functions like internal setting temperature, cooling, dry, and heating operations.
Details on indoor/outdoor fan motor operation, speed settings, and airflow direction adjustments.
Explains Quiet, Powerful, Timer, Auto Restart, nanoe-G, Mild Dry Cooling, ECONAVI, and AUTO COMFORT modes.
Thermostat control for cooling operation in multi-split systems.
Thermostat control for soft dry operation in multi-split systems.
Thermostat and temperature sampling control for heating operation in multi-split systems.
Details on automatic operation mode selection based on temperature and conditions for multi-split systems.
Covers restart control, running current limits, IPM, compressor overheating, low pressure, and frequency protection.
Details on protection mechanisms for cooling/soft dry modes including temperature, overload, freeze, dew, and odor controls.
Protection controls specific to heating operations, covering intake air, outdoor air, overload, oil return, cold draught, and deice.
Procedures for activating servicing modes using the Auto OFF/ON button for auto, test run, and remote control switch.
Details on using SET, RESET, and TIMER buttons for remote control configuration and memory management.
Diagnosing and resolving problems related to the refrigeration cycle, pressure, and current.
Procedures for using the self-diagnosis function, displaying memorized errors, clearing errors, and temporary operation.
A comprehensive table listing all error codes, their abnormalities, judgments, problems, and check locations.
Detailed troubleshooting steps for various error codes (H11, H12, H14-H37, H97-H99, F11, F17, F90-F99) related to sensors, motors, and system functions.
Step-by-step guide for disassembling indoor unit components like front grille, controller, fan, and control board.
Step-by-step guide for disassembling CS-E18NK indoor unit components like front grille, vane, controller, fan, and board.
Procedures for removing electronic controllers from outdoor units for CU-E7NKD, CU-E9NKD, CU-E12NKD, CU-E15NKD, and CU-E18NKD.
Performance data including cooling and heating characteristics, and piping length effects for various models.
Charts detailing sensible cooling capacity based on indoor and outdoor temperatures for different models.
Exploded views and parts lists for indoor units CS-E7NKDW, CS-E9NKDW, CS-E12NKDW, CS-E15NKDW, and CS-E18NKDW.
Exploded views and parts lists for outdoor units CU-E7NKD, CU-E9NKD, CU-E12NKD, CU-E15NKD, and CU-E18NKD.












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