To Next PageTo Next PageWhat to do if Mitsubishi Electric MUZ-A12YV-E1 Air Conditioner indoor unit doesn't operate in COOL or HEAT mode?
If the indoor unit of your Mitsubishi Electric Air Conditioner isn't operating normally in COOL or HEAT mode, start by checking the indoor/outdoor connecting wire to ensure power is supplied to the indoor unit. Also, check of indoor electronic control P.C. board.
What to do if left lamp flashes 4 times on Mitsubishi Electric MUZ-A12YV-E1?
If the left lamp on your Mitsubishi Electric Air Conditioner flashes four times, the cause is related to the indoor unit. Replace the indoor electronic control P.C. board.
What to do if left lamp flashes 2 times on Mitsubishi Electric MUZ-A12YV-E1 Air Conditioner?
If the left lamp on your Mitsubishi Electric Air Conditioner flashes twice, check the room temperature thermistor and the indoor coil thermistor. Refer to "Test point diagram and voltage".
What to do if left lamp flashes 7 times on Mitsubishi Electric MUZ-A12YV-E1 Air Conditioner?
If the left lamp on your Mitsubishi Electric Air Conditioner flashes seven times, the cause is related to the outdoor unit. Replace the inverter P.C. board.
What to do if left lamp flashes 6 times on Mitsubishi Electric MUZ-A12YV-E1 Air Conditioner?
If the left lamp on your Mitsubishi Electric Air Conditioner flashes six times, the issue stems from the outdoor unit. Refer to G "Check of outdoor thermistors".
What to do if left lamp flashes 5 times on Mitsubishi Electric Air Conditioner?
If the left lamp on your Mitsubishi Electric Air Conditioner flashes five times, the problem lies within the outdoor unit. Refer to A "Check of inverter/ compressor".
What to do if left lamp flashes 3 times on Mitsubishi Electric MUZ-A12YV-E1?
If the left lamp on your Mitsubishi Electric Air Conditioner flashes three times, the issue is related to the indoor unit. Refer to "Check of indoor fan motor".
What to do if left lamp flashes on and off at 0.5-second intervals on Mitsubishi Electric MUZ-A12YV-E1 Air Conditioner?
If the left lamp of your Mitsubishi Electric Air Conditioner flashes on and off at 0.5-second intervals, the cause may be in the Indoor/ Outdoor unit. Refer to N "How to check of mis-wiring and serial signal error (When outdoor unit doesn't work)".
What to do if both lamps (Left and right) flash on and off at 0.5-second intervals on Mitsubishi Electric Air Conditioner?
If both lamps (left and right) on your Mitsubishi Electric Air Conditioner flash on and off at 0.5-second intervals, the problem is related to the indoor unit. Refer to "Check of installation of the horizontal vanes".
General| Cooling Capacity | 3.5 kW |
|---|---|
| Heating Capacity | 4.0 kW |
| Power Supply | 220-240 V, 50 Hz |
| Refrigerant | R32 |
| Noise Level (Indoor Unit) | 19 dB |
Details about R410A refrigerant, its properties, and installation considerations.
Lists specialized tools required for R410A refrigerant systems.
Specifications for refrigerant pipes used with R410A systems.
Guidance on applying special refrigeration oil to flare and union surfaces.
Procedures and precautions for air purging in refrigerant circuits for environmental protection.
Instructions for adding refrigerant, emphasizing liquid phase charging to prevent composition change.
Specifies the acceptable voltage range for operation.
Instructions regarding air flow settings for optimal performance.
Lists key parameters to measure for performance evaluation.
Presents data on low pressure and current under various operating conditions.
Performance data for cooling operation under different temperatures and humidity.
Performance data for heating operation under different temperatures.
Explains the operation and interlocking of the outdoor fan motor with the compressor.
Details the control logic for the R.V. coil in cooling and heating modes.
Maps sensors to their corresponding actuators and operational purposes.
Instructions for changing the defrost finish temperature setting via jumper wires.
Important safety and procedural guidelines to follow before and during troubleshooting.
Provides a flowchart and troubleshooting steps for various operational issues.
A table correlating LED indications and symptoms with specific causes and checkpoints.
Lists main components and their resistance/voltage criteria for checking defects.
Detailed procedure for diagnosing inverter and compressor issues.
Method to check for open phases in the inverter output voltage.
Procedure to test the resistance of the power transistor module for defects.
Steps to check compressor winding and operation time for abnormalities.
Steps to check the resistance of various outdoor thermistors.
Procedure to check the R.V. coil for defects and its effect on operation modes.
Steps to diagnose issues with the outdoor fan motor.
Procedure to check the incoming power supply and its distribution.
Method to check the current-limiting resistor for faults.
Procedure to check the expansion valve for proper operation and resistance.
Steps to check the defrost heater and its associated components.
Guide to diagnose and resolve mis-wiring and serial signal errors affecting outdoor unit operation.
Step-by-step guide to remove the outdoor unit's cabinet.
Instructions for removing the inverter and power circuit boards.
Steps for removing the R.V. coil component.
Guide to remove the defrost and discharge temperature thermistors.
Instructions for removing the outdoor fan motor.
Steps to remove the compressor and the 4-way valve.
Lists structural and functional parts of the outdoor unit with part numbers.
Lists electrical components of the outdoor unit with their part numbers.
Information and part number for the drain socket.
