To Next PageTo Next PageWhat to do if Mitsubishi Electric MUH-A12YV-E1 indoor unit doesn't operate when EMERGENCY OPERATION switch is pressed?
First, check the connecting wire between the indoor unit and the remote. Then, refer to "Check of indoor electronic control P.C. board".
What to do if Mitsubishi Electric MUH-A12YV-E1 Air Conditioner unit doesn't operate normally in COOL or HEAT mode?
Refer to C "Check of R.V. coil" on page 25.
Why is the Mitsubishi Electric MUH-A12YV-E1 outdoor unit OPERATION INDICATOR lamp flashing?
The OPERATION INDICATOR lamp might be flashing due to several reasons: * A serial signal issue between the indoor and outdoor units. * A problem with the room temperature or indoor coil thermistor. * A problem with the indoor fan motor. * A problem with the thermistor in the outdoor unit. * A problem with the outdoor control system. If this is the case, replace the deicer P.C. board. For the first three issues, check the room temperature thermistor and indoor coil thermistor. For the fourth issue, refer to E "Check of outdoor thermistor" on page 27. For the serial signal issue, refer to "Test point diagram and voltage".
What to do if Mitsubishi Electric Air Conditioner outdoor unit doesn't stop even if indoor unit stops?
Refer to B "Check of outdoor unit" on page 25.
What to do if Mitsubishi Electric MUH-A12YV-E1 Air Conditioner indoor unit operates when the EMERGENCY OPERATION switch is pressed?
Refer to "Check of remote controller and receiver P.C. board".
Why Mitsubishi Electric Air Conditioner outdoor unit operates only in Test Run operation?
Check the room temperature thermistor. Refer to "Test point diagram and voltage".
What to do if Mitsubishi Electric MUH-A12YV-E1 Air Conditioner outdoor unit doesn't operate even in Test Run operation?
Refer to A "Check of outdoor unit" on page 24.
General| Cooling Capacity | 3.5 kW |
|---|---|
| Heating Capacity | 4.0 kW |
| Energy Efficiency Class (Cooling) | A++ |
| Energy Efficiency Class (Heating) | A+ |
| Refrigerant | R32 |
| Power Supply | 220-240 V, 50 Hz |
| Type | Split System |
Details changes to outdoor heat exchangers and fan motors for specific model series.
Compares R410A vs R22 characteristics, required tools, and oil compatibility.
Lists required tools for R410A, noting changes in service port size and tool compatibility.
Specifies required dimensions and materials for refrigerant pipes.
Explains differences in flaring techniques for R410A pipes compared to R22.
Covers oil application, environmental safety for purging, and correct refrigerant charging methods.
Illustrates the outdoor unit with key external connections and air flow paths.
Lists items provided with the outdoor unit, such as drain fittings.
Details capacity, power consumption, fan speeds, and operational ratings.
Presents sound pressure levels across different frequency bands for various operating conditions.
Depicts the standard methodology and positioning for sound level measurements.
Provides detailed measurements and overall size of the outdoor unit for installation planning.
Specifies minimum clearances around the unit essential for airflow and service access.
Illustrates the internal wiring and identifies key electrical components with their designations.
Illustrates the internal refrigerant circuit for both operational modes.
Labels key parts within the refrigerant circuit such as valves, strainers, and capillary tubes.
Defines installation constraints for refrigerant piping length and vertical height difference.
Provides guidelines for the amount of refrigerant needed based on piping length.
Explains voltage requirements, airflow settings, and key measurement terms for performance charts.
Details the steps and setup for accurately measuring indoor air temperatures.
Shows how cooling capacity and input energy vary with indoor/outdoor temperatures.
Shows how heating capacity and input energy vary with indoor/outdoor temperatures.
Illustrates how outdoor low pressure changes in relation to ambient temperature and humidity.
Displays outdoor unit current draw based on ambient temperature and humidity.
Shows how outdoor unit current varies with ambient temperature during heating operation.
Provides detailed performance data (capacity, heat factors, input) across various indoor/outdoor conditions.
Provides detailed performance data (capacity, heat factors, input) across various indoor/outdoor conditions.
Provides detailed performance data (capacity, heat factors, input) across various indoor/outdoor conditions.
Provides detailed performance data (capacity, input) across various indoor/outdoor conditions.
Provides detailed performance data (capacity, input) across various indoor/outdoor conditions.
Provides detailed performance data (capacity, input) across various indoor/outdoor conditions.
Explains control logic for high pressure protection and defrosting during heating.
Illustrates operational timing for defrost, fan, and RV coil based on various conditions.
Describes how the "I FEEL CONTROL" feature manages heat operation.
Details manual defrost activation and modification of defrost interval/temperature settings.
Outlines essential checks before diagnosing issues, including power supply and wiring integrity.
Guides users through diagnosing issues based on unit behavior and indicator lamp status.
Lists common error codes indicated by the indoor unit's flashing lamp and their potential causes.
Provides resistance values and criteria for diagnosing key electrical components.
Details a flowchart for diagnosing issues where the compressor or fan motor fails to operate.
Provides a guide for diagnosing units that fail to stop operation as expected.
Explains how to diagnose and resolve issues where the unit operates in the wrong mode (COOL vs. HEAT).
Guides users through checking for serial communication errors between indoor and outdoor units.
Outlines procedures to identify and rectify mis-wiring or poor external connections.
Details the process for checking the resistance of the outdoor thermistor (RT61).
Provides steps to diagnose thermistor issues and their potential resolutions.
Maps out the location and labels of key components on the deicer control board.
Displays the resistance-temperature curve for the defrost thermistor.
Explains how to detach terminals with and without a lock mechanism.
Provides step-by-step instructions and visual aids for removing the outdoor unit's cabinet.
Details the steps for safely removing the deicer control board.
Outlines the procedure for disassembling the fan motor and propeller assembly.
Provides step-by-step instructions for safely removing the compressor, including refrigerant handling.
Lists and illustrates structural components with their part numbers and quantities.
Lists electrical components, motors, capacitors, and boards with their part numbers.
Lists specific accessories like drain sockets and caps with their part numbers.
