To Next PageTo Next PageWhy does my Mitsubishi Electric Air Conditioner remote controller display 'PLEASE WAIT'?
After the power is turned on, the Mitsubishi Electric Air Conditioner displays “PLEASE WAIT” for 2 minutes during system startup. This is normal. Wait until “PLEASE WAIT” disappears before using the remote controller.
What to do if the trouble is not reoccurring and logged in Mitsubishi Electric PUHZ-P250YHA3 Air Conditioner?
If the issue isn't consistently happening but is logged, it might be due to temporary problems such as protection devices activating in the refrigerant circuit including compressor, poor wiring connections, or noise. Re-check the symptom, and inspect the installation environment, refrigerant level, weather conditions when the problem occurred, and wiring. After servicing, clear the error code logs and restart the unit.
What to do if the trouble is not reoccurring and not logged in Mitsubishi Electric PUHZ-P250YHA3 Air Conditioner?
If the abnormal symptom is not reoccurring and not logged, re-check the symptom. If the cause isn't clear, continue using the unit for now.
What to do if my Mitsubishi Electric PUHZ-P250YHA3 shows error code after startup?
When the Mitsubishi Electric Air Conditioner displays error code after startup, it could be because the outdoor unit’s protection device connector is open. Check the outdoor unit’s protection device connector.
What to do if Mitsubishi Electric PUHZ-P250YHA3 Air Conditioner displays error code after startup?
If your Mitsubishi Electric Air Conditioner displays error code after startup, there might be an open connection in the remote controller transmission wire. Check for an open connection in the remote controller transmission wire.
General| Brand | Mitsubishi Electric |
|---|---|
| Model | PUHZ-P250YHA3 |
| Category | Air Conditioner |
| Language | English |
General safety rules for repair service and during operation.
Specific precautions for using R410A refrigerant.
Important service procedures for refrigerant handling.
Instructions for adding refrigerant directly from a cylinder.
Lists exclusive service tools for R410A refrigerant.
Guidelines for refrigerant piping, emphasizing R410A specific requirements.
Dimensions for flare cutting and nuts for R410A.
Compatibility of tools for R410A refrigerant.
Explains the pre-charged refrigerant system for easier installation.
Table showing refrigerant charge based on piping length.
Technical data for the compressor.
Noise level curves for different frequencies.
Standard operating data for cooling and heating modes.
Minimum required clearance around the unit for installation.
Required space for servicing and maintenance access.
Specifications for foundation mounting bolts.
Directions for piping and wiring connections.
Details of knockout holes for piping and wiring.
Symbols and names used in the wiring diagrams.
Power wiring specifications for field installation.
Wiring diagrams for synchronized twin and triple systems.
Power supply configurations for separate indoor/outdoor units.
Wiring for simultaneous multi-unit systems.
Specifications for indoor-outdoor connecting cables.
Method for wiring the M-NET communication system.
Specifics on using shield wire for M-NET communication.
Procedure for setting M-NET addresses.
Procedure for setting refrigerant addresses.
Rules for setting addresses in multi-group systems.
Procedure for recovering refrigerant using the pump-down method.
Steps for performing test runs from the outdoor unit.
Summary of actions for recurring and non-recurring troubles.
Points to check before performing a test run.
Common symptoms and their potential causes during test runs.
List of trouble codes displayed on the LCD.
Procedure for performing a test run using a wireless remote controller.
Steps for performing self-diagnosis during operation or service.
Steps to diagnose issues with the remote controller itself.
Method for diagnosing malfunctions using a wireless remote controller.
List of error codes and symptoms detected by the indoor unit.
List of error codes and symptoms detected by the outdoor unit.
Table of errors detected on power-on and their corrective actions.
Details on miswiring, unit count, and start-up time errors.
Errors related to high pressure, discharge temperature, and open/short thermistors.
Errors related to thermistors, heatsink temperature, power module, and fan motor.
Errors related to voltage, overheat, compressor overcurrent, and low pressure.
Remote controller transmission and signal receiving errors.
Remote controller control board and clock function errors.
Remote controller transmission and signal receiving errors.
Indoor/outdoor unit communication errors.
Handling of undefined error codes.
Serial communication errors between boards and M-NET.
M-NET communication errors like address duplication and BUS BUSY.
Communication errors with the communication processor.
More details on NO ACK signal errors and group operation.
M-NET NO RESPONSE errors.
Troubleshooting common phenomena like no display or slow response.
Steps to troubleshoot a non-functional remote controller display.
Diagnosing the persistent "PLEASE WAIT" display.
Troubleshooting intermittent operation display.
Troubleshooting unit start-up issues and compressor delays.
Diagnosing reduced cooling or heating capacity.
Troubleshooting persistent "PLEASE WAIT" display using diagnosis flow.
Troubleshooting a completely blank remote controller display.
Further troubleshooting steps for a blank remote controller display.
Additional troubleshooting for a blank remote controller display.
Customer calls regarding the unit not operating at all.
Customer calls about the "PLEASE WAIT" message on the remote.
Customer calls regarding the "FILTER" display notification.
Customer calls about the "STANDBY" mode display.
Customer calls about the "DEFROST" mode display.
Customer calls regarding insufficient cooling or heating.
Customer calls about various sounds from the air conditioner.
Customer calls about blower operation issues.
Further customer calls regarding blower operation.
Customer calls about airflow direction changes.
Troubleshooting unintended unit start-up.
Troubleshooting unintended unit stop.
Customer calls about white mist from the indoor unit.
Customer calls about water from the outdoor unit.
Troubleshooting dim or non-functional remote controller display.
Troubleshooting poor remote signal reception.
Checking resistance values for outdoor thermistors.
Procedure for checking the fan motor.
Checking the resistance of the four-way valve coil.
Checking the resistance of the compressor motor windings.
Checking the resistance of the linear expansion valve coil.
Detailed steps to check the DC fan motor and related boards.
Resistance charts for low-temperature thermistors.
Resistance charts for high-temperature thermistors.
Summary of how the linear expansion valve operates.
Wiring diagram for the linear expansion valve connection.
Table showing output pulses and valve operation.
Details on linear expansion valve operation and sounds.
Procedures for attaching and detaching the LEV coil.
Conditions under which emergency operation is available due to error codes.
Important checks and cautions before performing emergency operation.
Step-by-step instructions for activating emergency operation.
Steps to properly release from emergency operation.
Data values used during emergency operation.
Details on DIP switches, push switches, and their functions.
Functions of connectors and switches like CN31, SW6, SW5-6.
Explains special functions like low-level sound priority and demand control.
Normal LED indications on the outdoor controller board.
Mapping of LED blinking patterns to error codes and inspection methods.
Detailed error codes and inspection methods for outdoor unit abnormalities.
More error codes and their corresponding inspection methods.
SW2 settings for compressor current, error history, and thermostat ON time.
SW2 settings for number of indoor units, capacity, and indoor temperatures.
SW2 settings for indoor setting temperature, pipe temperatures, heatsink temperature, and discharge superheat.
SW2 settings for capacity save, error postponement history, and thermistor display.
SW2 settings for LEV opening pulse, indoor temperatures, and outdoor temperatures.
SW2 settings for discharge superheat, subcool, thermo-on time, and U9 error status.
SW2 settings for compressor operating frequency and target subcool.
How to set unit functions using the remote controller.
Function availability for different indoor unit system configurations.
Flowchart and steps for selecting functions via wired remote controller.
Detailed steps for function selection and setting confirmation.
Flowchart and steps for selecting functions via wireless remote controller.
Setting the display language for the remote controller.
Setting operation limits or locking functions on the remote controller.
Selecting modes like main/sub controller, clock, and timer functions.
Setting temperature units and display options on the remote controller.
Flowchart illustrating the remote controller function selection process.
Steps to access and monitor operation data using the remote controller.
List of request codes for monitoring operational data.
Detailed request codes for various unit states and information.
Request codes for error history, thermistor readings, and temperatures.
Request codes for fan operation, unit versions, and settings.
Detailed explanations for request codes related to operation state and indoor/outdoor unit control.
Detailed explanations for fan control and actuator output state request codes.
Detailed explanations for demand capacity and unit setting request codes.
Information on setting indoor unit capacity.
Setting for wireless pair connections.
How to operate and switch into maintenance mode.
Steps for measuring operation data while in maintenance mode.
Steps for removing the service panel and top panel.
Steps to remove the fan motor.
Steps to remove the electrical parts box.
Steps to remove the outdoor 2-phase pipe thermistor.
Steps to remove the outdoor thermistor.
Steps to remove outdoor pipe and discharge thermistors.
Steps to remove the 4-way valve and LEV coils.
Steps to remove the 4-way valve assembly.
Steps to remove the linear expansion valve.
Steps to remove the high pressure switch.
Steps to remove the compressor.
Steps to remove the accumulator.
