Mitsubishi Electric PUMY Air Conditioners

The outdoor unit's multi-controller board and power board are experiencing a communication issue, causing the air conditioning system to automatically stop operating. This code will appear on the remote controller or the outdoor unit LED.

This code indicates that the compressor's temperature (detected by thermistor TH4) has become excessively high, either continuously exceeding 110°C (230°F) for 5 minutes or momentarily going above 125°C (257°F). This signifies that the compressor is overheating, which can lead to severe damage.

The air conditioning system has detected an abnormally low pressure condition, which causes the system to automatically stop operating. This code will appear on the remote controller or the outdoor unit LED.

This code indicates an abnormally high pressure in the refrigeration system, detected by the high-pressure switch (63H) or sensor (63HS) exceeding 4.15 MPa during compressor operation. This often points to issues preventing proper heat dissipation.

This indicates that the air conditioner system has detected abnormally high pressure, either through the high-pressure switch (63H) or the high-pressure sensor (63HS). This can trigger a shutdown to protect the system.

This code indicates that the compressor's discharge temperature is too low, leading to abnormally low superheat. This problem is detected when the discharge superheat remains very low for an extended period (typically below -15°C or 5°F for 5 minutes), even when the electronic expansion valve (LEV) is set to its minimum open pulse.

This code indicates a shortage of refrigerant in the system, or conditions that mimic a shortage. It is detected by specific temperature and pressure readings, such as high discharge superheat and low high-side pressure, especially during heating or cooling operation.

An abnormality with the 4-way valve has been detected during heating mode, causing the air conditioning system to automatically stop. This error code may be related to delay code 1608.

This code is triggered when the drain sensor or float switch detects water accumulation, typically during cooling or dry operation. This usually indicates an issue with the drainage system, such as a clog, or a malfunctioning component in the drain line.

The system's drain overflow protection has been triggered, indicating a problem with water drainage. This causes the air conditioning system to automatically stop operating.

An abnormality has been detected with the drain sensor, which monitors water levels in the drain pan. This will cause the air conditioning system to automatically stop operating.

When using the wireless remote controller to set function numbers, unit numbers, or mode numbers, three short beeps indicate that the entered number is not recognized by the indoor unit. This means the input was invalid.

The system has detected an interruption in the compressor current, which may indicate a locked compressor. This will cause the air conditioning system to automatically stop operating. This error code may be related to delay code 4350.

The system has detected an excessive electrical current draw by the compressor, leading to an overcurrent protection interruption and system shutdown. This code will appear on the remote controller or the outdoor unit LED.

This code indicates issues with the power supply, such as the voltage being too low (shortage voltage trouble), too high (overvoltage trouble), or a problem with power synchronization. It can also point to a PAM (Pulse Amplitude Modulation) error or an L1 open-phase in the electrical connection. Specific sub-codes (3, 6, 7, 8) can be viewed via SW1 on the outdoor controller board for more detail.

This error indicates a problem with the power supply voltage, potentially too low or too high, or an issue with the PAM (Pulse Amplitude Modulation) circuit. It can also point to an open phase on the L1 line in a 3-phase system, or a fault with the primary current sensor.

This code indicates that the thermistor (TH8) monitoring the heat sink temperature is detecting a temperature outside its normal operating range during compressor activity. This usually suggests that the heat sink is not being adequately cooled, which can lead to overheating.

An abnormality has been detected in the power module, which is a critical component for controlling power to the system. This will cause the air conditioning system to automatically stop operating. This error code may be related to delay code 4350.

The system has detected an issue with the rotational speed of the outdoor fan motor, causing the air conditioning system to automatically stop operating. This error code may be related to delay code 4500.

These codes indicate a problem with one of the indoor unit's thermistors (temperature sensors) — specifically, TH21 for air inlet (5101), TH22 for liquid pipe (5102), or TH23 for gas pipe (5103). The sensor is detected as either open-circuited or short-circuited, meaning it cannot properly detect and report temperature.

An open or short circuit has been detected in either the liquid pipe temperature thermistor (TH22) or the suction pipe temperature thermistor (TH6). This will cause the air conditioning system to automatically stop operating. This error code may be related to delay code 1211.

An abnormality has been detected with the gas pipe temperature thermistor (TH23), which will cause the air conditioning system to automatically stop operating.

An open or short circuit has been detected in the outdoor liquid pipe temperature thermistor (TH3). This will cause the air conditioning system to automatically stop operating. This error code may be related to delay code 1205.

An open or short circuit has been detected in the ambient thermistor (TH7), which measures the outdoor air temperature. This will cause the air conditioning system to automatically stop operating. This error code may be related to delay code 1221.

An open or short circuit has been detected in the HIC (Heat Interchanger) pipe temperature thermistor (TH2). This will cause the air conditioning system to automatically stop operating. This error code may be related to delay code 1222.

An open or short circuit has been detected in the Heat Sink temperature thermistor (TH8). This will cause the air conditioning system to automatically stop operating. This error code may be related to delay code 1214.

This code indicates a problem with the high-pressure sensor (63HS), specifically if it detects a pressure of 1 kgf/cm² or less during operation. When this low pressure is detected, the compressor stops and enters a 3-minute anti-restart mode to protect the system. If the pressure remains low before a restart, it triggers an abnormal stop.

An abnormality has been detected in the low pressure sensor (63LS), which measures the low side refrigerant pressure. This will cause the air conditioning system to automatically stop operating. This error code may be related to delay code 1400.

An abnormality has been detected in the primary electrical current of the system. This will cause the air conditioning system to automatically stop operating. This error code may be related to delay code 4310.

The drain float switch, which prevents the drain pan from overflowing, has detected a contact failure. This will cause the air conditioning system to automatically stop operating.

A duplex address error has been detected, specifically when only an M-NET Remote controller is connected. This causes the air conditioning system to automatically stop operating.

A hardware error has occurred in the transmission processor, specifically when only an M-NET Remote controller is detected. This causes the air conditioning system to automatically stop operating.

The transmission bus for the M-NET Remote controller is detected as continuously busy, preventing proper communication and causing the air conditioning system to automatically stop.

A signal communication error has occurred with the transmission processor, specifically when only an M-NET Remote controller is detected. This causes the air conditioning system to automatically stop operating.

The system failed to receive an acknowledgment (ACK) signal from an M-NET device, specifically when only an M-NET Remote controller is detected. This causes the air conditioning system to automatically stop operating.

The system did not receive a response frame from an M-NET device, specifically when only an M-NET Remote controller is detected. This causes the air conditioning system to automatically stop operating.

These codes indicate a problem with the communication between the remote controller(s) and the indoor unit. This can occur if the main or sub remote controller cannot receive signals from an indoor unit, or if the indoor controller board cannot receive signals from a remote controller or another indoor unit.

This indicates a problem with the communication between the remote controller and the indoor unit, or between indoor units. This can be a failure to send or receive signals, preventing proper operation of the air conditioner.

The MA remote controller is experiencing a communication send error, indicating it cannot transmit signals to the system. This causes the air conditioning system to automatically stop operating.

The MA remote controller is experiencing a communication send error, indicating it cannot transmit signals to the system. This causes the air conditioning system to automatically stop operating. This is a distinct error code from 6832, although the description is similar.

The MA remote controller is experiencing a communication receive error. This indicates a problem receiving signals from the system, causing the air conditioning system to automatically stop operating.

An error has been detected regarding the total capacity of the connected indoor units, which causes the air conditioning system to automatically stop operating.

An error has been detected with the capacity code settings for the system, causing the air conditioning system to automatically stop operating.

The system detects that an excessive number of indoor units are connected, which exceeds the outdoor unit's design capacity. This causes the air conditioning system to automatically stop operating.

An error has been detected with the address settings of the connected indoor or outdoor units, causing the air conditioning system to automatically stop operating.

The M-NET remote controller for the Mitsubishi Electric PUMY Air Conditioner has detected a duplex address error, indicating a conflict where two or more devices on the M-NET network have the same address. This applies only to M-NET remote controllers.

The M-NET remote controller for the Mitsubishi Electric PUMY Air Conditioner has experienced a hardware error within its transmission processor, preventing proper communication. This applies only to M-NET remote controllers.

The M-NET remote controller for the Mitsubishi Electric PUMY Air Conditioner is indicating a 'BUSY' status on the transmission bus, which can mean an overload or a communication jam on the network. This applies only to M-NET remote controllers.

The M-NET remote controller for the Mitsubishi Electric PUMY Air Conditioner is experiencing a signal communication error with its transmission processor. This applies only to M-NET remote controllers.

The M-NET remote controller for the Mitsubishi Electric PUMY Air Conditioner did not receive an acknowledgment (ACK) signal from another device on the network. This means a command was sent, but no confirmation was received. This applies only to M-NET remote controllers.

The M-NET remote controller for the Mitsubishi Electric PUMY Air Conditioner did not receive a response frame from a device it attempted to communicate with. This indicates a general communication failure. This applies only to M-NET remote controllers.

The MA remote controller for the Mitsubishi Electric PUMY Air Conditioner is not receiving a communication signal, indicating a problem with the communication line or the transmitting device. This applies only to MA remote controllers.

The MA remote controller for the Mitsubishi Electric PUMY Air Conditioner is experiencing a general error when attempting to receive a communication signal. This applies only to MA remote controllers.

During the Mitsubishi Electric PUMY Air Conditioner remote controller check, error E3 (6832) indicates that there is electrical noise interfering with the transmission line, or that the indoor unit or another remote controller connected to the system is faulty.

The MA remote controller for the Mitsubishi Electric PUMY Air Conditioner is experiencing an error when attempting to send a communication signal. This applies only to MA remote controllers.

The MA remote controller for the Mitsubishi Electric PUMY Air Conditioner is experiencing a specific type of error when attempting to send a communication signal. This applies only to MA remote controllers.

There is an issue with the 4-way valve, which is responsible for switching between heating and cooling modes, specifically when the Mitsubishi Electric PUMY Air Conditioner is in heating mode. The system will stop operating.

The Mitsubishi Electric PUMY Air Conditioner system has detected an issue with the total capacity of the connected indoor units relative to the outdoor unit. This usually means the combination of units is mismatched.

An error related to the capacity code settings has been detected in the Mitsubishi Electric PUMY Air Conditioner system, preventing it from operating correctly.

The number of connected indoor units is incorrect or not properly registered with the outdoor unit of the Mitsubishi Electric PUMY Air Conditioner system. This causes a system error.

There is an error in the address settings of one or more units within the Mitsubishi Electric PUMY Air Conditioner system, preventing them from communicating or being recognized correctly.

The connected indoor and outdoor units of the Mitsubishi Electric PUMY Air Conditioner system are not compatible with each other, leading to a system error and preventing operation.

The Mitsubishi Electric PUMY Air Conditioner remote controller check detected a discrepancy in the number of bits between the data transmitted by the remote controller and the data actually received over the transmission line. This indicates data corruption or communication issues.

The outdoor unit's multi-controller or power circuit board is experiencing a communication error. This error will cause the Mitsubishi Electric PUMY Air Conditioner system to stop operating.

There is an issue with the low-pressure sensor (63LS), which monitors the system's low-side refrigerant pressure in the Mitsubishi Electric PUMY Air Conditioner. The system will stop operating.

There is an issue with the high-pressure sensor (63HS), which monitors the system's high-side refrigerant pressure in the Mitsubishi Electric PUMY Air Conditioner. The system will stop operating.

The Mitsubishi Electric PUMY Air Conditioner remote controller's self-diagnosis has found a fault in its internal send-receive circuit. This means the remote controller cannot properly transmit or receive data and likely needs repair or replacement.

An issue has been detected with the drain sensor, which monitors the water level in the drain pan of the Mitsubishi Electric PUMY Air Conditioner. This could be a fault with the sensor itself or its connection.

The drain float switch, which prevents drain pan overflow in the Mitsubishi Electric PUMY Air Conditioner, has a contact failure, meaning it's not operating correctly. The system will stop operating.

The drain pan of the Mitsubishi Electric PUMY Air Conditioner has reached an overflow level, triggering the protection mechanism to prevent water damage. The system will automatically cease operating.

The Mitsubishi Electric PUMY Air Conditioner system has detected a risk of freezing within the branch box or an indoor unit and has activated freeze protection. This prevents potential damage to the coils.

The Mitsubishi Electric PUMY Air Conditioner system has detected water leakage, likely from the indoor unit or drain pan, activating a safety shutdown to prevent damage.

There is an issue with the fan in the indoor unit of the Mitsubishi Electric PUMY Air Conditioner, which could be preventing proper air circulation. The system will stop operating.

The remote controller self-check for the Mitsubishi Electric PUMY Air Conditioner indicates that the remote controller itself is functioning correctly. If you are still experiencing issues, the problem likely lies elsewhere in the air conditioning system.

An error code and specific unit information (e.g., Error code A3, Error unit IU) are displayed on the remote controller screen, indicating an abnormality in the Mitsubishi Electric PUMY Air Conditioner system. The screen provides an option to reset the error.

The system has detected an issue with the compressor's temperature, which could indicate overheating or a sensor fault. The Mitsubishi Electric PUMY Air Conditioner system will automatically cease operating.

The system detects a low refrigerant level or a valve that is inappropriately closed during cooling operation. The Mitsubishi Electric PUMY Air Conditioner system will automatically cease operating.

A fault (open circuit or short circuit) has been detected in either the air inlet thermistor (TH21) or the compressor temperature thermistor (TH4) of the Mitsubishi Electric PUMY Air Conditioner. The system will stop operating.

A fault (open circuit or short circuit) has been detected in either the liquid pipe temperature thermistor (TH22) or the suction pipe temperature thermistor (TH6) of the Mitsubishi Electric PUMY Air Conditioner. The system will stop operating.

A fault (open circuit or short circuit) has been detected in the gas pipe temperature thermistor (TH23) of the Mitsubishi Electric PUMY Air Conditioner. The system will stop operating.

A fault (open circuit or short circuit) has been detected in the outdoor liquid pipe temperature thermistor (TH3) of the Mitsubishi Electric PUMY Air Conditioner. The system will stop operating.

A fault (open circuit or short circuit) has been detected in the ambient temperature thermistor (TH7) of the Mitsubishi Electric PUMY Air Conditioner. The system will stop operating.

A fault (open circuit or short circuit) has been detected in the HIC pipe temperature thermistor (TH2) of the Mitsubishi Electric PUMY Air Conditioner. The system will stop operating.

A fault (open circuit or short circuit) has been detected in the heat sink temperature thermistor (TH8) of the Mitsubishi Electric PUMY Air Conditioner. The system will stop operating.

The heat sink, which helps dissipate heat from power components in the Mitsubishi Electric PUMY Air Conditioner, is experiencing a temperature issue (likely overheating). The system will stop operating.

There is a problem with the power module or an overcurrent condition has been detected in the Mitsubishi Electric PUMY Air Conditioner. This indicates a serious electrical fault and the system will stop operating.

This error indicates an issue with the refrigerant superheat, specifically due to an abnormally low discharge temperature from the compressor. The Mitsubishi Electric PUMY Air Conditioner system will automatically cease operating.

An issue with the outdoor unit's fan has been detected, which can impact heat exchange efficiency and system operation. The Mitsubishi Electric PUMY Air Conditioner system will stop operating.

The Mitsubishi Electric PUMY Air Conditioner system has detected an irregularity with the incoming power supply, such as voltage outside the normal range, a PAM error, or an open L1 phase. The system will stop operating.

The system has detected excessively high pressure within the refrigerant circuit. This can occur due to various operational issues and will cause the Mitsubishi Electric PUMY Air Conditioner system to stop.

The Mitsubishi Electric PUMY Air Conditioner system has detected an interruption in the compressor's electrical current, indicating the compressor might be locked or unable to start. The system will stop operating.

A problem has been detected with the current sensor, which monitors the electrical current within the Mitsubishi Electric PUMY Air Conditioner unit. The system will stop operating.

This error indicates either the compressor is drawing too much current, or there's a problem with the 12 VDC power supply circuit on the outdoor unit's power circuit board of the Mitsubishi Electric PUMY Air Conditioner. The system will stop operating.