Mitsubishi Electronics PUZ-A30NHA2, PUZ-A42NHA2-BS Troubleshooting by Inferior Phenomena

Page 45

Error Code

Abnormal point and detection method

Case

Judgment and action

 

 

 

 

 

M-NET NO RESPONSE

1 Transmitting condition is

1 Check transmission waveform or noise on

 

Abnormal if a message was transmitted

repeated fault because of

transmission wire.

 

and there were reply (ACK) that message

noise and the like.

2 Turn off the power supply of outdoor unit and

 

was received, but response command

2 Extension of transmission wire

indoor unit and FRESH MASTER or LOSS-

 

does not return. Transmitting side detects

voltage and signal is caused

NAY at the same time for 2 minutes or more,

 

abnormality every 30 seconds, 6 times

by over-range transmission

and turn the power on again. If malfunction

 

wire.

 

continuously.

was accidental, the unit returns to normal. If

 

• Maximum distance ······200m

 

Note) The address and attribute displayed

the same abnormality generates again, con-

 

[656ft]

 

at remote controller indicate the con-

troller of displayed address and attribute

 

• Remote controller line ··(12m

 

troller that did not reply (ACK).

may be defective.

 

[39ft])

 

 

 

 

 

3 Extension of transmission wire

 

A8

 

voltage and signal is caused

 

(6608)

 

by type-unmatched transmis-

 

 

 

sion wire.

 

 

 

Type ······

 

 

 

With shield wire-

 

 

 

CVVS, CPEVS

 

 

 

With normal wire (no shield)-

 

 

 

VCTF, VCTFK, CVV

 

 

 

CVS, VVR, VVF, VCT

 

 

 

Diameter····1.25mm2 [AWG16]

 

 

 

or more

 

 

 

4 Accidental malfunction of

 

 

 

abnormality-generated

 

 

 

controller

 

 

 

 

 

10-5. TROUBLESHOOTING BY INFERIOR PHENOMENA

Phenomena

 

Factor

Countermeasure

 

 

 

1. Remote controller display does not

1DC12V is not supplied to remote controller.

1Check LED2 on indoor controller board.

work.

(Power supply display

is not indicated on LCD.)

(1) When LED2 is lit.

 

2DC12~15V is supplied to remote controller, however,

Check the remote controller wiring for

 

no display is indicated.

breaking or contact failure.

 

• “PLEASE WAIT” is not displayed.

(2) When LED2 is blinking.

 

• “PLEASE WAIT” is displayed.

Check short circuit of remote controller

 

 

 

wiring.

 

 

 

(3) When LED2 is not lit.

 

 

 

Refer to phenomena No.3 below.

 

 

 

2Check the following.

 

 

 

• Failure of remote controller if “PLEASE

 

 

 

WAIT” is not displayed

 

 

 

• Refer to phenomena No.2 below if

 

 

 

“PLEASE WAIT” is displayed.

 

 

 

2. “PLEASE WAIT” display is remained

1At longest 2 minutes after the power supply “PLEASE

1Normal operation

on the remote controller.

WAIT” is displayed to start up.

2Self-diagnosis of remote controller

 

2Communication error between the remote controller

3”PLEASE WAIT” is displayed for 6 min-

 

and indoor unit

 

utes at most in case of indoor/outdoor unit

 

3Communication error between the indoor and outdoor

communication error. Check LED3 on

 

unit

 

indoor controller board.

 

4Outdoor unit protection device connector is open.

(1)When LED3 is not blinking.

 

 

 

Check indoor/outdoor connecting wire

 

 

 

for miswiring.

 

 

 

(Converse wiring of S1 and S2, or

 

 

 

break of S3 wiring.)

 

 

 

(2)When LED3 is blinking.

 

 

 

Indoor/outdoor connecting wire is nor-

 

 

 

mal.

 

 

 

4Check LED display on outdoor controller

 

 

 

circuit board. Refer to 10-10.

 

 

 

Check protection device connector (63L

 

 

 

and 63H) for contact failure.

 

 

 

Refer to 10-9.

 

 

 

3. When pressing the remote controller

1After cancelling to select function from the remote

1Normal operation

operation switch the OPERATION

controller, the remote controller operation switch will

 

display is appeared but it will be

not be accepted for approx. 30 seconds.

 

turned off soon.

 

 

 

 

 

 

 

45

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Contents Parts Catalog OCB429 ContentsIndoor Unit Reference ManualAlways Observe for Safety Safety PrecautionAdditional refrigerant charge When charging directly from cylinderR22 Features PUZ-A18NHA2 PUZ-A18NHA2-BS PUY-A12/18NHA2 PUY-A12/18NHA2-BSPUZ-A42NHA2 PUZ-A42NHA2-BS PUY-A42NHA2 PUY-A42NHA2-BS PUZ-A18NHA2 PUZ-A24NHA2 PUZ-A30NHA2 PUZ-A36NHA2 PUZ-A42NHA2 SpecificationsPUY-A18NHA2-BS PUY-A24NHA2-BS Data Compressor Technical DataPUZ-A18NHA2-BS Noise Criterion CurvesHeat pump Standard Operation DataPKA-A12GA PKA-A18GA PKA-A24FA PKA-A30FA PKA-A36FA PLA-A42BA Cooling onlyUnit mminch Outdoor UnitExample of Notes 662-5/8 Air outlet Service SpaceNET Adapter Wiring DiagramNET Adapter PUZ-A24NHA2 PUZ-A24NHA2-BS PUY-A24NHA2 PUY-A24NHA2-BSWUse copper supply wires TABU/V/W System Simultaneous twin system Wiring SpecificationsOFF Separate Indoor UNIT/OUTDOOR Unit Power SuppliesIndoor Outdoor Connecting Cable Refrigerant address NET address Control Remote Controller NET Wiring MethodRefrigerant address setting NET address settingRegulations in address settings NET wiringPUZ-A18NHA2 PUZ-A18NHA2-BS Refrigerant System DiagramPUZ-A42NHA2 PUZ-A42NHA2-BS Way valve solenoid coil Heating on Cooling OFFPUY-A42NHA2 PUY-A42NHA2-BS PUY-A12/18NHA2 PUY-A12/18NHA2-BSStart and finish of test run Refrigerant recovering pump downTroubleshooting TroubleshootingCheck Point Under Test RUN Before test runOperating procedures Symptoms in test run mode Cause Remote Controller DisplayContents of inferior phenomena Test run for wireless remote controller HOW to Proceed SELF-DIAGNOSIS When a Problem Occurs During OperationSelf-Diagnosis During Maintenance or Service ON/OFF Remote Controller DiagnosisMalfunction-diagnosis method at maintenance service Malfunction-diagnosis method by wireless remote controllerProcedure Case of trouble during operationU9,UH 63L connector open Error Code Abnormal point and detection method CaseSELF-DIAGNOSIS Action Table CndcCase Judgment and action 63H connector open Error CodeConnector open Indoor/outdoor unit connectorHigh discharging temperature Case Judgment and action High pressure High-pressure switchAbnormalities detected while unit is operating 63H workedTemperature of heatsink Temperature thermistor TH4Power module Case Judgment and action Open/short circuit of dischargeWhen compressor locked Synchronous signal to main circuitCurrent sensor error Case Judgment and action Outdoor fan motorErrorE0/signal receiving errorE4 Remote controller transmissionRemote controller control board Case Judgment and action Low pressure 63L workedErrorE3/signal receiving errorE5 Case Judgment and action Remote controller transmissionError Signal receiving error Non defined error codeCase Judgment and action Pipe temperature NET communication errorHardware error of transmission Case Judgment and action Address duplicate definitionTo the next Fresh Master From the previousMaster LossnayTroubleshooting by Inferior Phenomena VCTF, VCTFK, CVV CVS, VVR, VVF, VCTPhenomena Factor Countermeasure Melans YES Please WaitPower supply To the outdoor unit Check the breaker Outdoor power circuit boardOutdoor connecting wire Miswiring, breakingDefective indoor Replace the indoor Power board Indoor/outdoor connecting wire BlinkingNot lighting Breaking or poor Fix the breaking or poorCheck if there is breaking Action Table Before repair Frequent calling from customersSometimes This is the sound which is heard when the flow Phone Calls From Customers How to RespondRefrigerant in the air conditioner is switched This is not a malfunctionWith Blower… With Airflow Direction…There might be a case that Page HOW to Check the Parts Power supply check Remove the connector CNF1 Wiring contact checkFuse check ENDThermistor feature chart Low temperature thermistors HOW to Check the ComponentsMedium temperature thermistor High temperature thermistorOutput pulse signal and the valve operation Operation summary of the linear expansion valveLinear expansion valve operation Linear expansion valve A24, 30, 36 How to attach the coil How to detach the coilBe sure to attach the stopper Emergency Operation Emergency operation procedureReleasing emergency operation SW4Operation data during emergency operation Test Point Diagram CNAC1, CNAC2 LI, NICN5 LO, noPUZ-A24NHA2 PUZ-A24NHA2-BS PUY-A24NHA2 PUY-A24NHA2-BS RS1 DIP-PFC LD1-LD2DIP-IPM CN3 CN4 CN5CN3 CnafTABP2/SC-P2 ActmUpper side Lower sideL1, L2 Function of switches Function of SWITCHES, Connectors and JumpersFunction Action by the switch operation Effective timing OFFSW9 2Function of connectorSpecial function 50%75% Display function of inspection for outdoor unit 1Check the outdoor fan motor 1Check if stop valves are open Blinking Abnormality of outdoor fan Motor rotational speedDigital indicator LED1 working details Operation indicator~9999 When it is 100 hours or more, hundreds digit, tens Example When 42500 times 425 100 times Secs 5secsExample When 2450 hours 245 10 hours Lighting Cancellation of postponementSW2 setting Display detail Explanation for display Unit Single phase 2 3 phase Outdoor unit setting informationUnit Cooling onlyDegF Fan step on error occurring ~10 Step Example When 130 pulse Secs Sub cool on error occurring. SC ~234 0~130degC Discharge superheat on error occurring ~327 0~182degC SHdExample When 415 minutes Minute Secs U9 Error status during the ErrorLED Rise of discharge temperatureMaintenance Mode Operation Method Easy Maintenance FunctionSwitching to maintenance mode Fixed Hz operationTo check the data for each item, repeat steps 5 to Data measurementGuide for Operation Condition Unit Function Setting by the Remote Controller Function SettingData of the sensor Ta=C On main remote Controller Average data Initial Ta=A+B/2 Sensor on allMode No.11 Setting No SettingsPLA-BA PCA-GA For modes 15 and higher Selecting functions using the wired remote controllerSpecified indoor unit Press E FAN operationOperating Procedure Operating instructions Flow of function selection procedureMode Selection Function Selection of Remote ControllerFunction selection flowchart FAN Mode VaneCheck button for 3 seconds to return to maintenance mode Button for 3 seconds to switch to Maintenance monitorTurn on the Monitoring the operation data PressRequest Code List Outdoor unit-Control state Code Description For indoor fan pulsation control 100101 Detail Contents in Request Code102 Error content U9 Request codeFan control state Request code Actuator output state Request codeOutdoor unit Setting information Request code Outdoor unit --Capacity setting display Request code103 Contact demand capacity Request code104 Indoor unit Capacity setting information Request code Indoor unit Model setting information Request code105 Data display See the table on the rightPUZ-A18NHA2 PUZ-A18NHA2-BS Operating Procedure Photos Disassembly Procedure106 Photo107 Removing the thermistor Outdoor 2-phase pipe TH6Removing the electrical parts box Thermistor Outdoor pipe TH3108 Operating Procedure Photos109 Removing the 4-way valveRemoving linear expansion valve 110 Separator Recover refrigerantRemoving the compressor MC Removing the accumulatorRemoving the service panel and top panel Operating Procedure Photos & Illustration111 Removing the fan motor MF1112 Removing the thermistor Outdoor pipe TH3Thermistor Discharge TH4 Removing the 4-way valve coil 113Removing the linear expansion valve coil Removing the bypass valve coil114 Removing the bypass valveRemoving the reactor ACLA24 115 Removing the reactor DCL A30Remove 2 receiver leg fixing screws 4 Removing the fan motor MF1, MF2 116Remove the service panel. See figure Outdoor pipe 117Remove the top panel. See figure Controller Are not oxidized 118Linear expansion Coil Valve coil119 Low pressure switch 63LRemoving the reactor DCL and capacitor CE DCLRemove 2 back cover panel fixing screws 5 10

PUZ-A36NHA2-BS, PUY-A12NHA2, PUY-A42NHA2-BS, PUY-A30NHA2, PUZ-A36NHA2 specifications

Mitsubishi Electronics has long been a leader in the HVAC industry, and their range of air conditioning units, including the PUY-A24NHA2, PUZ-A24NHA2, PUY-A24NHA2-BS, PUZ-A42NHA2-BS, and PUY-A42NHA2, exemplifies their commitment to innovation and energy efficiency. These models are designed to provide optimal climate control for both residential and commercial applications, ensuring comfort throughout the year.

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In summary, the Mitsubishi Electronics PUY-A24NHA2, PUZ-A24NHA2, PUY-A24NHA2-BS, PUZ-A42NHA2-BS, and PUY-A42NHA2 air conditioning units are equipped with cutting-edge technology, offering energy efficiency, quiet operation, and smart functionality. Whether for residential or commercial use, these units are designed to meet the demands of modern climate control while prioritizing energy savings and sustainability.
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