Mitsubishi Electric MSZ-FH06

This blinking pattern indicates that the serial communication signal from the outdoor unit has not been received for 6 minutes. This is a critical communication breakdown between the indoor and outdoor units, preventing them from coordinating operations and leading to system malfunction. The unit will not operate without proper communication.

This indicates a short or open circuit in either the indoor coil thermistor or the room temperature thermistor. The fault affects the unit's ability to accurately monitor internal temperatures, potentially leading to issues like coil freezing, improper defrost cycles, or inaccurate temperature control. If left unaddressed, this can cause operational inefficiency and damage to the refrigeration system.

This code signifies one of two distinct issues depending on the operating context: either the serial communication signal from the outdoor unit is not received for up to 6 minutes, or the indoor fan motor's rotational frequency feedback signal is absent for 12 seconds after operation. Both conditions prevent the indoor unit from operating correctly, resulting in a lack of airflow or complete system shutdown. Timely resolution is crucial for proper unit function and comfort.

This fault occurs when the indoor electronic control P.C. board cannot properly read data from its nonvolatile memory. It indicates a critical issue with the board's internal memory, which prevents the unit from retaining settings or executing operational commands. Without a functioning control board, the indoor unit will remain inoperable.

This fault is triggered when the compressor stops three consecutive times within one minute of startup due to overcurrent protection or startup failure protection. It points to significant issues within the outdoor unit's power delivery, compressor, or refrigeration system. Leaving this unresolved risks severe damage to the compressor and other critical components.

This fault indicates poor contact in the i-see SENSOR wiring or an error during the loading of its corrected data. The i-see SENSOR is crucial for intelligent detection of room occupants and optimized airflow, so its malfunction can lead to reduced comfort and inefficient energy use. The unit may operate but without smart sensing capabilities.

This fault occurs when any outdoor thermistor (e.g., ambient, discharge, liquid line) experiences a short or open circuit during compressor operation. This prevents the outdoor unit from accurately sensing temperatures, impacting defrost cycles, capacity control, and overall system efficiency. Failure to address this can lead to system instability, freezing, or inefficient heating/cooling.

This error indicates that the inverter P.C. board or the outdoor electronic control P.C. board cannot properly read data from its nonvolatile memory. This signifies a corrupted or inaccessible memory on the outdoor control board, critical for compressor control and overall unit coordination. If this issue is not resolved, the outdoor unit will be unable to operate, making the entire system non-functional.

This fault is indicated when the rotational frequency feedback signal from the indoor fan motor is not emitted for 12 seconds after the motor begins operation. This means the control system cannot confirm the fan's speed or operation, leading to a lack of airflow, insufficient heat exchange, and potential unit overheating. Resolution is critical for maintaining proper air circulation and system performance.

This fault occurs when the indoor electronic control P.C. board experiences an inability to properly read data from its nonvolatile memory. This is a critical internal error of the main control board, preventing it from functioning correctly, storing settings, or managing unit operations. The unit will remain inoperable until this memory issue is resolved.

This fault indicates that an abnormality other than the specifically defined fault codes has been detected within the system. It serves as a general alert for an unusual condition that requires deeper investigation, potentially involving multiple interconnected issues or a component not individually listed. The unit's operation will be impaired until the underlying cause is identified.

A continuously lit left lamp signifies a critical memory reading failure on either the inverter P.C. board or the outdoor electronic control P.C. board. This error means the outdoor unit's core control system cannot initialize or function correctly, rendering the entire air conditioning system inoperable. It often indicates a hardware fault requiring board replacement.