Mitsubishi Electronics PUY-A18NHA2 Case Judgment and action Open/short circuit of discharge

Page 38

Error Code

 

Abnormal point and detection method

Case

 

 

Judgment and action

 

 

 

 

 

 

 

Open/short circuit of discharge

1 Disconnection or contact

 

 

1 Check connection of connector (TH4) on the

 

temperature thermistor (TH4)

failure of connector (TH4) on

 

outdoor controller circuit board.

 

Abnormal if open (3: [37˚F] or less) or

the outdoor controller circuit

 

Check breaking of the lead wire for

 

short (217: [422˚F] or more) is detected

board

 

 

thermistor (TH4). Refer to 10-9.

 

during compressor operation.

2 Defective thermistor

 

 

2 Check resistance value of thermistor (TH4) or

U3

(Detection is inoperative for 10 minutes of

3 Defective outdoor controller

 

temperature by microcomputer.

 

(Thermistor/TH4: Refer to 10-6.)

compressor starting process and for 10

circuit board

 

 

(5104)

 

 

 

 

(SW2 on A-Control Service Tool: Refer to 10-

minutes after and during defrosting.)

 

 

 

 

 

 

 

 

 

 

 

10.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 Replace outdoor controller board.

 

 

 

 

 

Open/short of outdoor unit thermistors

1 Disconnection or contact failure

1 Check connection of connector (TH3,TH6/TH7)

 

(TH3, TH6, TH7, and TH8)

of connectors

 

)

on the outdoor controller circuit board.

 

Abnormal if open or short is detected

Outdoor controller circuit

 

Check connection of connector (CN3) on the

 

during compressor operation.

board: TH3,TH6/TH7

 

outdoor power circuit board.

 

Open detection of thermistors TH3 and

Outdoor power circuit board:

Check breaking of the lead wire for thermistor

 

TH6 is inoperative for 10 seconds to 10

(CN3

 

(TH3,TH6,TH7,TH8). Refer to 10-9.

 

minutes after compressor starting and 10

2 Defective thermistor

 

 

2 Check resistance value of thermistor

 

minutes after and during defrosting.

3 Defective outdoor controller

 

(TH3,TH6,TH7,TH8) or check temperature by

 

WCheck which unit has abnormality in its

circuit board

 

 

microcomputer.

 

 

 

 

thermistor by switching the mode of

 

 

 

(Thermistor / TH3, TH6, TH7, TH8 : Refer to 10-6.)

U4

 

SW2. (PAC-SK52ST)

 

 

 

 

(SW2 on A-Control Service Tool: Refer to 10-

 

(Refer to 10-10.)

 

 

 

 

10.)

 

 

 

(TH3:5105)

 

 

 

 

 

 

 

 

 

 

 

 

 

3 Replace outdoor controller circuit board.

 

 

 

 

 

 

 

(TH6:5107)

 

 

 

 

 

 

 

WEmergency operation is available in case of

(TH7:5106)

 

 

 

 

 

 

 

abnormalities of TH3, TH6 and TH7.

(TH8:5110)

 

 

 

 

 

 

 

Refer to 10-8.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermistors

 

 

Open detection

 

Short detection

 

 

 

Symbol

 

Name

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TH3

 

Thermistor <Outdoor pipe>

– 40:[-40˚F] or below

 

90:[194˚F] or above

 

 

 

TH6

 

Thermistor <Outdoor 2-phase pipe>

– 40:[-40˚F] or below

 

90:[194˚F] or above

 

 

 

TH7

 

Thermistor <Outdoor>

– 40:[-40˚F] or below

 

90:[194˚F] or above

 

 

 

TH8

 

Thermistor <Heatsink>

– 27:[-17˚F] or below

 

102:[216˚F] or above

 

 

 

 

 

 

 

 

Temperature of heatsink

1 The outdoor fan motor is

 

 

12 Check outdoor fan.

 

Abnormal if heat sink thermistor(TH8)

locked.

 

 

 

 

 

 

 

detects temperature indicated below.

2 Failure of outdoor fan motor

 

3 Check airflow path for cooling.

 

A12, 18, 42N··············84:, 183˚F

3 Air flow path is clogged.

 

 

 

A24, 30, 36N··············81:, 177˚F

4 Rise of ambient temperature

 

4 Check if there is something which causes

 

 

 

 

 

5 Defective thermistor

 

 

temperature rise around outdoor unit.

 

 

 

 

 

6 Defective input circuit of

 

 

(Upper limit of ambient temperature is 46:

 

 

 

 

 

outdoor power circuit board

 

[114˚F].)

 

 

 

 

 

 

 

7 Failure of outdoor fan drive

 

Turn off power, and on again to check if U5

 

 

 

 

 

 

is displayed within 30 minutes.

U5

 

 

 

 

circuit

 

 

 

 

 

 

 

 

If U4 is displayed instead of U5, follow the

(4230)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

action to be taken for U4.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5 Check resistance value of thermistor (TH8)

 

 

 

 

 

 

 

 

or temperature by microcomputer.

 

 

 

 

 

 

 

 

(Thermistor/TH8: Refer to 10-6.)

 

 

 

 

 

 

 

 

(SW2 on A-Control Service Tool: Refer to 10-

 

 

 

 

 

 

 

 

10.)

 

 

 

 

 

 

 

 

 

 

 

6 Replace outdoor power circuit board.

 

 

 

 

 

 

 

 

7 Replace outdoor controller circuit board.

 

 

 

 

 

 

Power module

 

1 Outdoor stop valve is closed.

1 Open stop valve.

 

Check abnormality by driving power module

2 Decrease of power supply voltage

2 Check facility of power supply.

 

in case overcurrent is detected.

3 Looseness, disconnection or

 

3 Correct the wiring (U·V·W phase) to

U6

(UF or UP error condition)

converse of compressor wiring

compressor. Refer to 10-9 (Outdoor power

(4250)

 

 

 

 

connection

 

 

circuit board).

 

 

 

 

 

 

 

4 Defective compressor

 

 

4 Check compressor referring to 10-6.

5Defective outdoor power circuit 5 Replace outdoor power circuit board. board

38

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Contents Contents Parts Catalog OCB429Reference Manual Indoor UnitSafety Precaution Always Observe for SafetyWhen charging directly from cylinder Additional refrigerant chargeR22 PUZ-A42NHA2 PUZ-A42NHA2-BS PUY-A42NHA2 PUY-A42NHA2-BS FeaturesPUZ-A18NHA2 PUZ-A18NHA2-BS PUY-A12/18NHA2 PUY-A12/18NHA2-BS Specifications PUZ-A18NHA2 PUZ-A24NHA2 PUZ-A30NHA2 PUZ-A36NHA2 PUZ-A42NHA2PUY-A18NHA2-BS PUY-A24NHA2-BS Compressor Technical Data DataNoise Criterion Curves PUZ-A18NHA2-BSStandard Operation Data Heat pumpCooling only PKA-A12GA PKA-A18GA PKA-A24FA PKA-A30FA PKA-A36FA PLA-A42BAOutdoor Unit Unit mminchExample of Notes Service Space 662-5/8 Air outletWiring Diagram NET AdapterPUZ-A24NHA2 PUZ-A24NHA2-BS PUY-A24NHA2 PUY-A24NHA2-BS NET AdapterWUse copper supply wires TABU/V/W Wiring Specifications System Simultaneous twin systemSeparate Indoor UNIT/OUTDOOR Unit Power Supplies OFFIndoor Outdoor Connecting Cable NET Wiring Method Refrigerant address NET address Control Remote ControllerRegulations in address settings NET address settingRefrigerant address setting NET wiringPUZ-A42NHA2 PUZ-A42NHA2-BS Refrigerant System DiagramPUZ-A18NHA2 PUZ-A18NHA2-BS Way valve solenoid coil Heating on Cooling OFFPUY-A12/18NHA2 PUY-A12/18NHA2-BS PUY-A42NHA2 PUY-A42NHA2-BSRefrigerant recovering pump down Start and finish of test runCheck Point Under Test RUN TroubleshootingTroubleshooting Before test runContents of inferior phenomena Operating proceduresSymptoms in test run mode Cause Remote Controller Display Test run for wireless remote controller Self-Diagnosis During Maintenance or Service HOW to Proceed SELF-DIAGNOSISWhen a Problem Occurs During Operation Remote Controller Diagnosis ON/OFFProcedure Malfunction-diagnosis method by wireless remote controllerMalfunction-diagnosis method at maintenance service Case of trouble during operationU9,UH SELF-DIAGNOSIS Action Table Error Code Abnormal point and detection method Case63L connector open CndcConnector open Error CodeCase Judgment and action 63H connector open Indoor/outdoor unit connectorAbnormalities detected while unit is operating Case Judgment and action High pressure High-pressure switchHigh discharging temperature 63H workedPower module Temperature thermistor TH4Temperature of heatsink Case Judgment and action Open/short circuit of dischargeCurrent sensor error Synchronous signal to main circuitWhen compressor locked Case Judgment and action Outdoor fan motorRemote controller control board Remote controller transmissionErrorE0/signal receiving errorE4 Case Judgment and action Low pressure 63L workedError Signal receiving error Case Judgment and action Remote controller transmissionErrorE3/signal receiving errorE5 Non defined error codeHardware error of transmission NET communication errorCase Judgment and action Pipe temperature Case Judgment and action Address duplicate definitionTo the next Master From the previousFresh Master LossnayPhenomena Factor Countermeasure Troubleshooting by Inferior PhenomenaVCTF, VCTFK, CVV CVS, VVR, VVF, VCT Melans Please Wait YESOutdoor connecting wire Outdoor power circuit boardPower supply To the outdoor unit Check the breaker Miswiring, breakingNot lighting Indoor/outdoor connecting wire BlinkingDefective indoor Replace the indoor Power board Breaking or poor Fix the breaking or poorCheck if there is breaking Before repair Frequent calling from customers Action TableRefrigerant in the air conditioner is switched Phone Calls From Customers How to RespondSometimes This is the sound which is heard when the flow This is not a malfunctionThere might be a case that With Blower…With Airflow Direction… Page HOW to Check the Parts Fuse check Wiring contact checkPower supply check Remove the connector CNF1 ENDMedium temperature thermistor HOW to Check the ComponentsThermistor feature chart Low temperature thermistors High temperature thermistorLinear expansion valve operation Output pulse signal and the valve operationOperation summary of the linear expansion valve Linear expansion valve A24, 30, 36 How to detach the coil How to attach the coilBe sure to attach the stopper Releasing emergency operation Emergency operation procedureEmergency Operation SW4Operation data during emergency operation Test Point Diagram CN5 LI, NICNAC1, CNAC2 LO, noPUZ-A24NHA2 PUZ-A24NHA2-BS PUY-A24NHA2 PUY-A24NHA2-BS RS1 DIP-IPM LD1-LD2DIP-PFC CN3 CN4 CN5TABP2/SC-P2 CnafCN3 ActmL1, L2 Upper sideLower side Function Action by the switch operation Effective timing Function of SWITCHES, Connectors and JumpersFunction of switches OFF2Function of connector SW975% Special function50% Display function of inspection for outdoor unit Blinking Abnormality of outdoor fan Motor rotational speed 1Check the outdoor fan motor 1Check if stop valves are openOperation indicator Digital indicator LED1 working detailsExample When 2450 hours 245 10 hours Example When 42500 times 425 100 times Secs 5secs~9999 When it is 100 hours or more, hundreds digit, tens Lighting Cancellation of postponementSW2 setting Display detail Explanation for display Unit Unit Outdoor unit setting informationSingle phase 2 3 phase Cooling onlyDegF Fan step on error occurring ~10 Step Example When 130 pulse Example When 415 minutes Minute Secs Discharge superheat on error occurring ~327 0~182degC SHdSecs Sub cool on error occurring. SC ~234 0~130degC U9 Error status during the ErrorRise of discharge temperature LEDSwitching to maintenance mode Easy Maintenance FunctionMaintenance Mode Operation Method Fixed Hz operationData measurement To check the data for each item, repeat steps 5 toGuide for Operation Condition Data of the sensor Ta=C On main remote Controller Function SettingUnit Function Setting by the Remote Controller Average data Initial Ta=A+B/2 Sensor on allPLA-BA PCA-GA Mode No.11Setting No Settings Specified indoor unit Selecting functions using the wired remote controllerFor modes 15 and higher Press E FAN operationOperating Procedure Flow of function selection procedure Operating instructionsFunction Selection of Remote Controller Mode SelectionFunction selection flowchart Mode Vane FANTurn on the Monitoring the operation data Button for 3 seconds to switch to Maintenance monitorCheck button for 3 seconds to return to maintenance mode PressRequest Code List Outdoor unit-Control state Code Description 100 For indoor fan pulsation controlDetail Contents in Request Code 101Fan control state Request code Error content U9 Request code102 Actuator output state Request code103 Outdoor unit --Capacity setting display Request codeOutdoor unit Setting information Request code Contact demand capacity Request code104 105 Indoor unit Model setting information Request codeIndoor unit Capacity setting information Request code Data display See the table on the right106 Disassembly ProcedurePUZ-A18NHA2 PUZ-A18NHA2-BS Operating Procedure Photos PhotoRemoving the electrical parts box Removing the thermistor Outdoor 2-phase pipe TH6107 Thermistor Outdoor pipe TH3Operating Procedure Photos 108Removing linear expansion valve 109Removing the 4-way valve Removing the compressor MC Separator Recover refrigerant110 Removing the accumulator111 Operating Procedure Photos & IllustrationRemoving the service panel and top panel Removing the fan motor MF1Thermistor Discharge TH4 112Removing the thermistor Outdoor pipe TH3 Removing the linear expansion valve coil 113Removing the 4-way valve coil Removing the bypass valve coilRemoving the reactor ACLA24 114Removing the bypass valve Remove 2 receiver leg fixing screws 4 115Removing the reactor DCL A30 116 Removing the fan motor MF1, MF2Remove the top panel. See figure Controller Remove the service panel. See figure Outdoor pipe117 Linear expansion 118Are not oxidized Coil Valve coilRemoving the reactor DCL and capacitor CE Low pressure switch 63L119 DCLRemove 2 back cover panel fixing screws 5 10

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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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