![]() Use the Testing dip switches in the app and compare system gauge pressure to Low Pressure Sensor reading – If the pressure sensor is faulty it will read 0.0 bar even though there is pressure in the system. Problem with pressure sensor reading incorrectly.Ĭheck the system standing pressure for a complete gas loss. Restriction or blockage in refrigerant circuit causing low side pressure to drop. Mitsubishi error code 1301 (Low pressure fault)Ĭause : Possible refrigerant leak. Use the testing dip switches in the app and check the system running pressures/temperatures and determine if the system is short of gas or if there is a restriction in the circuit – a restriction may show frosting where refrigerant expands, this could be a blocked strainer, faulty expansion valve operation or perhaps moisture in the system.Ĭheck compressor running current -if higher than expected this could show a compressor issue. Mitsubishi error code 1102 (Discharge temperature fault)Ĭause : Insufficient cooling of the compressor caused by lack of refrigerant or a restriction in the refrigerant circuit, high ambient running conditions or airflow problems on either indoor or outdoor unit (depending on running mode), over heating of compressor through increased friction (compressor beginning to seize), faulty thermistor reading. If test is not required then set the dip switch to OFF. Mitsubishi error code 0900 (Test run)Ĭause : Test operation dipswitch on the Lossnay circuit board has been set ON.Ĭheck the position of Dipswitch SW2-1 on the main control board. ![]() The online document link will take you to the document library where Service Handbooks can be viewed. ![]() This is not normally a problem with the main PCB.Ĭorrect testing should allow you to identify which of the 2 boards is the cause. If there are no loose connections on either PCBs and the voltages are good then the Fan or Inverter PCB is usually at fault. Then check for poor connections between the PCB’s. If the detail code is 5 then the issue is between the main board and fan board. If the detail code is 1, then the issue is between the main board and inverter board. If the model number is YGMA, YHMA, YJMA, YKMA or YLMA, check the error detail code using the dip-switches section of the app to determine which PCB’s the transmission fault is with. If the model number is YGMA, YHMA, YJMA, YKMA or YLMA then the issue can be between the main board and inverter board or main board and fan board.Ĭheck for poor connections and broken wiring between the boards. Mitsubishi error code 0403 (Serial communication error)Ĭause : The fault occurs when there is a communication issue between PCB’s in the outdoor unit. Let’s get started with Mitsubishi electric air conditioner error codes first. No matter you want to troubleshoot your own Mitsubishi air conditioner or troubleshooting for clients, this mitsubishi ac troubleshooting guide will help. Today we are please to offer the complete list of Mitsubishi aircon error codes.
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