To Next PageTo Next PageWhat to do if the Mitsubishi Electric MXZ-8C48NA trouble has reoccurred?
If a problem with your Mitsubishi Electric Air Conditioner keeps happening, determine the cause and take corrective action as described in section “8-3 SELF-DIAGNOSIS ACTION BY FLOWCHART”. Also, troubleshoot to find the cause of the issue, referring to section “8-4. TROUBLESHOOTING BY INFERIOR PHENOMENA”.
What to do if the Mitsubishi Electric Air Conditioner trouble is not reoccurring?
If the trouble with your Mitsubishi Electric Air Conditioner is not reoccurring, consider temporary issues like protection devices activating in the refrigerant circuit (including the compressor), loose wiring, or noise. Re-examine the symptoms, installation environment, refrigerant level, weather conditions when the problem occurred, and wiring. Reset check code logs and restart the unit after finishing service. There may be no abnormality concerning parts such as the electrical component, controller board, remote controller, etc.
What to do if the Mitsubishi Electric Air Conditioner trouble is not logged?
If the trouble with your Mitsubishi Electric Air Conditioner is not logged, re-check the abnormal symptom. If the cause isn't clear, keep using the unit for now. Troubleshoot and find the cause of the issue according to “8-4. TROUBLESHOOTING BY INFERIOR PHENOMENA”. There may be no abnormality concerning parts such as the electrical component, controller board, remote controller, etc.
General| Brand | Mitsubishi Electric |
|---|---|
| Model | MXZ-8C48NA |
| Category | Air Conditioner |
| Language | English |
General safety rules to follow before accessing the unit's terminal.
Specific safety precautions when working with new refrigerants like R410A.
Guidelines for safe and correct refrigerant piping installation practices.
Details the system construction, including outdoor and indoor units, and branch boxes.
Illustrates a typical system configuration with outdoor, branch, and indoor units.
Presents examples of combining indoor units with outdoor units and branch boxes.
Details piping connection sizes for liquid and gas lines, and illustrates simplified piping.
Provides detailed specifications for various outdoor unit models.
Lists specifications for different branch box models, including connections and dimensions.
Flowchart for selecting appropriate indoor and outdoor units based on load and temperature.
Provides correction curves for cooling capacity and power input based on temperature.
Presents standard operating data, including ambient conditions and refrigerant amounts.
Includes diagrams showing capacity, power input, and current ratios based on total indoor unit capacity.
Explains how to correct capacity based on refrigerant piping length using correction curves.
Details how to correct heating capacity for frost and defrosting using a correction factor.
Presents noise criterion curves for different outdoor unit models across various frequency bands.
Provides dimensions and installation space requirements for outdoor units.
Shows dimensions and piping connections for various branch box models.
Provides wiring diagrams for different outdoor unit models.
Illustrates wiring diagrams for PAC-MKA50BC and PAC-MKA30BC branch boxes.
Details the setup requirements for the transmission system, including wiring and addresses.
Illustrates the refrigerant flow for cooling and heating modes for various unit combinations.
Explains the typical control system setup, including remote controller functions and troubleshooting.
Provides a summary of check codes and corresponding troubleshooting actions for recurring issues.
Provides a flowchart for diagnosing and resolving serial communication errors.
Troubleshooting flowchart for compressor temperature issues, including check codes.
Troubleshooting flowchart for high pressure issues, including check codes and causes.
Troubleshooting flowchart for superheat issues related to low discharge temperature.
Troubleshooting flowchart for refrigerant shortage issues, including check codes.
Troubleshooting flowchart for issues related to closed valves in cooling mode.
Troubleshooting flowchart for 4-way valve issues specifically in heating mode.
Troubleshooting flowchart for compressor current interruption due to locking.
Troubleshooting flowchart for compressor overcurrent interruption issues.
Troubleshooting flowchart for voltage, PAM, and signal errors.
Troubleshooting flowchart for heat sink temperature issues.
Troubleshooting flowchart for power module or overcurrent issues.
Troubleshooting flowchart for fan motor issues.
Troubleshooting flowchart for TH4 compressor thermistor open/short circuit.
Troubleshooting flowchart for TH6 suction pipe thermistor open/short circuit.
Troubleshooting flowchart for TH3 outdoor liquid pipe thermistor open/short circuit.
Troubleshooting flowchart for TH7 ambient temperature thermistor open/short circuit.
Troubleshooting flowchart for TH2 HIC pipe temperature thermistor open/short circuit.
Troubleshooting flowchart for TH8 heat sink temperature thermistor open/short circuit.
Troubleshooting flowchart for high pressure sensor (63HS) issues.
Troubleshooting flowchart for low pressure sensor (63LS) issues.
Troubleshooting flowchart for current sensor or primary current errors.
Troubleshooting flowchart for duplex address errors in units.
Troubleshooting flowchart for transmission processor hardware errors.
Troubleshooting flowchart for transmission bus busy errors.
Troubleshooting flowchart for signal communication errors with the transmission processor.
Troubleshooting flowchart for 'No ACK' communication errors.
Troubleshooting flowchart for 'No response frame' communication errors.
Troubleshooting flowchart for MA communication receive errors.
Troubleshooting flowchart for MA communication send errors.
Troubleshooting flowchart for total capacity errors related to connected indoor unit names.
Troubleshooting flowchart for capacity code errors with connected indoor units.
Troubleshooting flowchart for errors related to exceeding unit or branch box connection limits.
Troubleshooting flowchart for address setting errors in outdoor units or branch boxes.
Troubleshooting flowchart for errors when indoor and outdoor units are not compatible.
Provides troubleshooting steps for common operational phenomena and their causes.
Diagram and explanation of the CN51 connector for external control.
Diagram and explanation of the CN3N connector for auto change over.
Diagram and explanation of the CN3D connector for silent mode and demand control.
Details how to check various outdoor unit parts, including thermistors and motors.
Provides a step-by-step guide to check DC fan motors and related circuit boards.
Details how to check the multi controller circuit board and associated fuses.
Explains how to check the power circuit board, including voltage and resistance measurements.
Provides guidance on checking the M-NET power circuit board and its connections.
Diagram showing test points and DIP switch functions on the branch box controller board.
Presents characteristic graphs showing resistance versus temperature for various thermistors.
Explains how to compare high pressure sensor readings with gauge pressure and provides sensor configuration.
Explains how to compare low pressure sensor readings with gauge pressure and provides sensor configuration.
Details how to check thermistors and linear expansion valves on branch box controller boards.
Illustrates output pulse signals and valve operations for linear expansion valves.
Provides instructions and diagrams for attaching and detaching linear expansion valve coils.
Lists common problems with linear expansion valves and their corrective measures.
Diagram showing test points on the outdoor multi controller circuit board.
Diagram showing test points and connections on the outdoor power circuit board.
Diagram showing test points and connections on the M-NET power circuit board.
Details SW5 settings for common and individual unit operations.
Details functions and display details for SW2 and SW5 settings.
Lists functions, settings, and remarks for remote controller setup.
Explains the meaning of function settings for indoor temperature detection.
Provides precautions against refrigerant leakage, including concentration calculations.
Step-by-step instructions for disassembling the outdoor unit.
Step-by-step instructions for disassembling branch box components.
