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INVERTER TROUBLESHOOTING SEMINAR Inverter Deluxe CS/CU-30XHA2 03rd November 2006

Innhold FortegnelseKjlesyklus Block Diagram Strm Skjema Elektroniske Komponenter Service Tips for en bedre installasjon Selv Diagnose Metoder Feilsking p Inverter

CS/CU-30XHA2 Refrigeration Cycle, Block Diagram and Wiring Diagram

CS/CU-30XHA2 Refrigeration CycleInput Indoor DC fan motor Output Pipe sensor Intake air sensor AC fan motor Outdoor 4 way valve AC compressor Pipe sensor Intake air sensor Compressor top sensor IPM sensor

CU-30XHA2 compressor lubricant is Polyester POE (RB68A) But CU-56XHA2: Polyether PVE (FV68S). So, no need dryer.

CS/CU-30XHA2 Block Diagram

CS-30XHA2 Wiring DiagramPin 1: Motor power supply voltage (~325Vdc) Pin 4: 0V (reference potential) Pin 5: Motor control voltage (15Vdc) Pin 6: Rotation command (1~5Vdc) Pin 7: Rotation pulse input /feedback DC Motor Full Wave Diode Bridge Rectification

Secondary Circuitry for Low DC Voltage Supply

CU-30XHA2 Wiring Diagram

Switch Mode Transformer Communication Circuitry

AC Motor

Inverter (Variable Speed Drive Circuitry)

DC 4 Way Valve

PFC AC to DC Rectifier 3-P Induction Rotary Compressor (Rolling Piston Type)

CS/CU-30XHA2 Electronic Components

CS-30XHA2 PCB LayoutCN-SONIC CN-FM

CN-TH CN-ION AUTO SW CN-STM1

CN-STM2

CN-DISP

HAJEM-A FUSE (3.15A, 250V)

LF01

T01

Indoor PCB Component Explanation1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. T01: Power transformer to step down AC voltage from 240Vac to 19~24Vac LF01: Power inductor (passive element) to suppress electromagnetic interference CN-FM: Channel connection for indoor DC fan motor CN-SONIC: Channel connection for supersonic generator (42kHz) CN-TH (pin1&2): Indoor intake air temperature sensor CN-TH (pin3&4): Indoor pipe temperature sensor CN-ION: Channel connector for high voltage generator (-4.2kV) AUTO SW: Emergency switch CN-STM1: Vertical vane CN-STM2: Horizontal vane CN-DISP: Connection to display complete HAJEM-A: Home Automation (for Japan only)

CU-30XHA2 PCB Layout

CN-TANK CN-TH CN-HOT CN-FM

FUSE2 (3.15A, 250V)

CN-S

RY-PWR RY-AC1

RY-C

DB1 DB2 RY-LO

CT101 C-FM DB3 Fan Motor Connectors FUSE1 (3.15A, 250V)

Outdoor PCB Component Explanation1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. DB1: AC to DC rectification for PFC DB2: AC to DC rectification for IPM/Inverter drive circuitry DB3: AC to DC rectification for mode switch transformer RY-C: PFC circuit ON/OFF relay RY-AC1: Power supply relay for peak current saturation control RY-PWR: Power supply relay turn ON a few seconds after RY-AC1 being turned OFF RY-LO: AC fan motor ON/OFF relay C-FM: AC fan motor capacitor CT101: Current transformer CN-TANK: Compressor top temperature sensor CN-TH (pin1&2): Outdoor intake air temperature sensor CN-TH (pin3&4): Outdoor pipe temperature sensor CN-HOT: 4 way valve CN-FM: DC fan motor (not applicable) CN-S: Force cooling switch (rated frequency)

Servicing Mode

Servicing ModeAuto ON/OFF without remote controller

Auto ON/OFF with remote controller

Press TIMER decrement button until a pep sound is heard

Servicing ModeVarious setting mode

*

*Remark: Not applicable

Tips for Better Installations

Problem Due To Poor Installation: Indoor Unit

Problem Due To Poor Installation: Indoor Unit

Problem Due To Poor Installation: Indoor Unit

Problem Due To Poor Installation: Indoor Unit

Problem Due To Poor Installation: Outdoor Unit

Problem Due To Poor Installation: Outdoor Unit

Problem Due To Poor Installation: Outdoor Unit

Problem Due To Poor Installation: Outdoor Unit

Problem Due To Improper Drain Line Installation

Problem Due To Improper Drain Line Installation

Problem Due To Improper Drain Line Installation

Problem Due To Improper Drain Line Installation

Problem Due To Improper Drain Line Installation

Problem Due To Improper Electrical Work

Problem Due To Improper Electrical Work

Problem Due To Improper Electrical Work

Problem Due To Improper Electrical Work

Problem Due To Improper Coolant Line Work

R410A and R22

Problem Due To Improper Coolant Line Work

Problem Due To Improper Coolant Line Work

Problem Due To Improper Coolant Line Work

Problem Due To Improper Coolant Line Work

Problem Due To Improper Coolant Line Work

Problem Due To Improper Coolant Line Work

Problem Due To Improper Coolant Line Work

Problem Due To Improper Coolant Line Work

Inverter Troubleshooting

Self-diagnosis MethodWhen error code happen, system will stop operation and TIMER LED will blink. To IDENTIFY real-time error code: 1. Press CHECK button for more than 5 seconds till H00 appear on the remote controller LCD. 2. Press TIMER or V button to scroll for the error code. 3. If the error code displayed matches the error code saved in the indoor EEPROM, beep sound will be heard (~4 seconds) and POWER LED will be ON. TIMER and V CHECK To ERASE error code stored in the indoor EEPROM: 1. Press Auto SW button on the indoor unit for more than 5 seconds till beep sound is heard. 2. Press CHECK button till one beep sound is heard to confirm the error code is permanently erased. To READ past error code stored in the indoor EEPROM: Method same as to identify the real-time error code.

Self-diagnosis Method

Indoor/Outdoor Abnormal Communication (H11)Malfunction Decision Conditions:During standby and operation of cooling and heating, the data received from outdoor unit in indoor unit signal transmission is checked whether it is normal.

Malfunction Caused:1. Faulty outdoor unit PCB. 2. Faulty indoor unit PCB. 3. Indoor-outdoor signal transmission error due to wrong wiring. 4. Indoor-outdoor signal transmission error due to breaking of wire in the connection wires between the indoor and outdoor units. 5. Indoor-outdoor signal transmission error due to disturbed power supply waveform.

Abnormality Judgment:1 min after operation.

Indoor/Outdoor Abnormal Communication (H11)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the indoor-outdoor units connection wires. Yes Correct the indoor-outdoor units connection wires.

Is there any wiring error? No Disconnect terminal 3 wire and measure Vdc between terminal 2 & 3 from the outdoor unit. Is the Vdc fluctuate between 20-70Vdc? Yes Reconnect terminal 3 wire and measure Vdc between terminal 2 & 3 from the outdoor unit. Yes Is the Vdc fluctuate between 20-70Vdc?

No Replace outdoor unit PCB.

No Replace indoor unit PCB.

Indoor/Outdoor Abnormal Communication (H11)Communication voltage measurement:

Indoor signal Outdoor signal

70Vdc 20Vdc

To determine if outdoor PCB or indoor PCB is faulty: 1. Start with outdoor terminal first. 2. Remove terminal 3 wire. 3. Measure with a multimeter (voltage in DC range). 4. If it is never constant, outdoor PCB is good fluctuating in between 20-70Vdc, outdoor PCB is in good condition.

Connection Capability Rank Abnormality (H12)Malfunction Decision Conditions:1. Occur when connect in an multi free inverter system. 2. However, for single split system (ONLY: CS-E21~24DKE), when indoor and outdoor are disconnected from one another, H12 will appear but with conditions.

Malfunction Caused:1. Wrong models interconnected. 2. Wrong indoor unit and outdoor unit PCBs used. 3. Indoor unit or outdoor unit PCB defective. 4. Indoor-outdoor signal transmission error due to wrong wiring. 5. Indoor-outdoor signal transmission error due to breaking of wire 3 in the connection wires between the indoor and outdoor units.

Abnormality Judgment:H12 will trigger 90 seconds after power supply turn ON. (But H11 will trigger 60 seconds after operation starts)

Connection Capability Rank Abnormality (H12)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the indoor-outdoor units connection wires. Yes Is there any wiring error? No Check indoor and outdoor units model number. Is the indoor and outdoor model number matched? Yes Check the spare part numbers of the indoor and outdoor unit PCBs and compare with their Part Lists. No Matched compatibility? Yes No Match the compatible model.

Correct the indoor-outdoor units connection wires.

Change for the specified indoor or outdoor unit PCB. Replace the indoor and outdoor unit PCBs.

Indoor Intake Air Temperature Sensor Abnormality (H14)Malfunction Decision Conditions:During startup and operation of cooling and heating, the temperatures detected by the indoor intake air temperature sensor are used to determine sensor errors.

Malfunction Caused:1. Faulty connector connection. 2. Faulty sensor. 3. Faulty PCB.

Abnormality Judgment:Continue for 5 seconds.

Indoor Intake Air Temperature Sensor Abnormality (H14)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the connector connection: - Turn off the power - Check the connector connection No

Is the connector connection normal? Yes

- Connector poor contact - Correct the connection

Check the indoor intake air temperature sensor: - Plug out connector from the indoor unit PCB - Measure the resistance of the indoor intake air temperature sensor

Is the measured resistance of the indoor intake air temperature sensor matches the value specified in its characteristic chart? Yes

No

- Defect in indoor intake air temperature sensor - Replace the indoor intake air temperature sensor

- Defect in indoor unit PCB - Replace the indoor unit PCB

Compressor Temperature Sensor Abnormality (H15)Malfunction Decision Conditions:During startup and operation of cooling and heating, the temperatures detected by the compressor temperature sensor are used to determine sensor errors.

Malfunction Caused:1. Faulty connector connection. 2. Faulty sensor. 3. Faulty PCB.

Abnormality Judgment:Continue for 5 seconds.

Compressor Temperature Sensor Abnormality (H15)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the connector connection: - Turn off the power - Check the connector connection No

Is the connector connection normal? Yes

- Connector poor contact - Correct the connection

Check the compressor temperature sensor: - Plug out connector from the outdoor unit PCB - Measure the resistance of the compressor temperature sensor

Is the measured resistance of the compressor temperature sensor matches the value specified in its characteristic chart? Yes

No

- Defect in compressor temperature sensor - Replace the compressor temperature sensor

- Defect in outdoor unit PCB - Replace the outdoor unit PCB

Outdoor Current Transformer Open Circuit (H16)Malfunction Decision Conditions:A current transformer (CT) is detected by checking the compressor running frequency ( rated frequency) and CT detected input current (less than 0.65A) for continuously 20 seconds.

Malfunction Caused:1. CT defective. 2. Outdoor PCB defective. 3. Compressor defective (low compression).

Abnormality Judgment:Continue 3 times in 20 minutes.

Outdoor Current Transformer Open Circuit (H16)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the functionality of current transformer (CT). Yes Is the CT open circuit? No Force heating operation and measure: 1. Running current 2. Suction pressure Replace the outdoor PCB.

Is the running current less than 0.65A and suction pressure 120psi?

Yes

Replace compressor due to compressor low compression.

No

Replace the indoor and outdoor unit PCBs.

Indoor Fan Motor (DC Motor) Mechanism Locked (H19)Malfunction Decision Conditions:1. The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor (feedback of rotation > 2550rpm or < 50rpm).

Malfunction Caused:1. Operation stop due to short circuit inside the fan motor winding. 2. Operation stop due to breaking of wire inside the fan motor. 3. Operation stop due to breaking of fan motor lead wires. 4. Operation stop due to Hall IC malfunction. 5. Operation error due to faulty indoor unit PCB.

Abnormality Judgment:Fan motor runs for 5 seconds and stops for 25 seconds, and repeat continuously for 7 times.

Indoor Fan Motor (DC Motor) Mechanism Locked (H19)Troubleshooting:Turn off power supply and rotate fan by hand. No Does fan rotate smoothly? Yes Turn power supply on and operate fan. No Does it rotate? Replace fan motor. Check the output of fan motor from indoor PCB. Is the motor power supply voltage ~325Vdc (pin1 & 4) generated? Yes Is the motor control voltage 15Vdc (pin5 & 4) generated? Stop fan motor. Check the rotation feedback output from fan motor. Rotate the fan motor by hand, is the rotation feedback voltage 15Vdc (pin7 & 4) generated? Yes No Yes Operate the fan, is the rotation command voltage 1-5Vdc (pin6 & 4) generated? Yes Replace fan motor. Replace indoor PCB. No Replace indoor PCB. No Replace indoor PCB. NoFor safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Turn off power supply and disconnect fan motor connector, then turn power on.

Replace indoor PCB.

Replace fan motor.

Indoor Pipe Temperature Sensor Abnormality (H23)Malfunction Decision Conditions:During startup and operation of cooling and heating, the temperatures detected by the indoor pipe temperature sensor are used to determine sensor errors.

Malfunction Caused:1. Faulty connector connection. 2. Faulty sensor. 3. Faulty PCB.

Abnormality Judgment:Continue for 5 seconds.

Indoor Pipe Temperature Sensor Abnormality (H23)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the connector connection: - Turn off the power - Check the connector connection No

Is the connector connection normal? Yes

- Connector poor contact - Correct the connection

Check the indoor pipe temperature sensor: - Plug out connector from the indoor unit PCB - Measure the resistance of the indoor pipe temperature sensor

Is the measured resistance of the indoor pipe temperature sensor matches the value specified in its characteristic chart? Yes

No

- Defect in indoor pipe temperature sensor - Replace the indoor pipe temperature sensor

- Defect in indoor unit PCB - Replace the indoor unit PCB

Outdoor Intake Air Temperature Sensor Abnormality (H27)Malfunction Decision Conditions:During startup and operation of cooling and heating, the temperatures detected by the outdoor intake air temperature sensor are used to determine sensor errors.

Malfunction Caused:1. Faulty connector connection. 2. Faulty sensor. 3. Faulty PCB.

Abnormality Judgment:Continue for 5 seconds.

Outdoor Intake Air Temperature Sensor Abnormality (H27)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the connector connection: - Turn off the power - Check the connector connection No

Is the connector connection normal? Yes

- Connector poor contact - Correct the connection

Check the outdoor air temperature sensor: - Plug out connector from the outdoor unit PCB - Measure the resistance of the outdoor intake air temperature sensor

Is the measured resistance of the outdoor intake air temperature sensor matches the value specified in its characteristic chart? Yes

No

- Defect in outdoor intake air temperature sensor - Replace the outdoor intake air temperature sensor

- Defect in outdoor unit PCB - Replace the outdoor unit PCB

Outdoor Pipe Temperature Sensor Abnormality (H28)Malfunction Decision Conditions:During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature sensor are used to determine sensor errors.

Malfunction Caused:1. Faulty connector connection. 2. Faulty sensor. 3. Faulty PCB.

Abnormality Judgment:Continue for 5 seconds.

Outdoor Pipe Temperature Sensor Abnormality (H28)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the connector connection: - Turn off the power - Check the connector connection No

Is the connector connection normal? Yes

- Connector poor contact - Correct the connection

Check the outdoor pipe temperature sensor: - Plug out connector from the outdoor unit PCB - Measure the resistance of the outdoor pipe temperature sensor

Is the measured resistance of the outdoor pipe temperature sensor matches the value specified in its characteristic chart? Yes

No

- Defect in outdoor pipe temperature sensor - Replace the outdoor pipe temperature sensor

- Defect in outdoor unit PCB - Replace the outdoor unit PCB

Unspecified Voltage between Indoor and Outdoor (H33)Malfunction Decision Conditions:The supply power is detected for its requirement by the indoor/outdoor transmission.

Malfunction Caused:1. Wrong models interconnected. 2. Wrong indoor unit and outdoor unit PCBs used. 3. Indoor unit or outdoor unit PCB defective.

Unspecified Voltage between Indoor and Outdoor (H33)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check indoor and outdoor units model number. Is the indoor and outdoor model number matched? Yes Check the spare part numbers of the indoor and outdoor unit PCBs and compare with their Part Lists. No Matched compatibility? Yes No Match the compatible model.

Change for the specified indoor or outdoor unit PCB. Replace the indoor and outdoor unit PCBs.

Indoor High Pressure Protection (H98)Error code will not display (no TIMER LED blinking) but store in EEPROM Malfunction Decision Conditions:During heating operation, the temperature detected by the indoor pipe temperature sensor is above 60oC.

Malfunction Caused:1. Clogged air filter of the indoor unit. 2. Dust accumulation on the indoor unit heat exchanger. 3. Air short circuit. 4. Detection error due to faulty indoor pipe temperature sensor. 5. Detection error due to faulty indoor unit PCB.

Indoor High Pressure Protection (H98)Error code will not display (no TIMER LED blinking) but store in EEPROM Troubleshooting:Check the air passage. Yes Is there any short circuit? No Check the air filter. Yes Is the air filter dirty? No Check the dust accumulation on the indoor unit heat exchanger. Clean the air filter. Does it conform to the sensor characteristic chart? No Check the indoor pipe temperature sensor. YesFor safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Provide sufficient air passage.

Replace the indoor unit PCB. Replace the indoor pipe temperature sensor.

Is the indoor unit heat exchanger dirty? No

Yes Clean the heat exchanger.

Indoor Freeze-up Protection (H99)Error code will not display (no TIMER LED blinking) but store in EEPROM Malfunction Decision Conditions:Anti-freezing control take place (when indoor pipe temperature is lower than 2oC).

Malfunction Caused:1. Clogged air filter of the indoor unit. 2. Dust accumulation on the indoor unit heat exchanger. 3. Air short circuit. 4. Detection error due to faulty indoor pipe temperature sensor. 5. Detection error due to faulty indoor unit PCB.

Indoor Freeze-up Protection (H99)Error code will not display (no TIMER LED blinking) but store in EEPROM Troubleshooting:Check the air passage. Yes Is there any short circuit? No Check the air filter. Yes Is the air filter dirty? No Check the dust accumulation on the indoor unit heat exchanger. Clean the air filter. Does it conform to the sensor characteristic chart? No Check the indoor pipe temperature sensor. YesFor safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Provide sufficient air passage.

Replace the indoor unit PCB. Replace the indoor pipe temperature sensor.

Is the indoor unit heat exchanger dirty? No

Yes Clean the heat exchanger.

Four Way Valve Abnormality (F11)Malfunction Decision Conditions:1. During heating operation, when indoor pipe temperature is below 10oC. 2. During cooling operation, when indoor pipe temperature is above 45oC.

Malfunction Caused:1. Connector in poor contact. 2. Faulty sensor. 3. Faulty outdoor unit PCB. 4. Four way valve defective.

Abnormality Judgment:Continue 4 times in 30 minutes.

Four Way Valve Abnormality (F11)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Four way valve coil disconnected (loose)? Check the indoor pipe temperature sensor. No No Harness out of connector? Does it conform to the sensor characteristic chart? Yes Is F11 occur during heating operation? No Is the four way valve coil energize during cooling operation? No Yes Replace the outdoor unit PCB. Replace the four way valve. Yes Disconnect the harness from the connector. Resistance between harness about 18ohm? Yes Measure DC voltage supply to CN-HOT (pin1 & 2) during heating operation. Is the voltage supply to four way valve ~2.5~4.5Vdc? Yes Replace the indoor pipe temperature sensor. No Check the continuity of the four way valve coil.

Yes

Correct the four way valve coil.

Reconnect the harness.

No

Replace the four way valve coil.

No

Replace the outdoor unit PCB. Replace the four way valve.

Power Factor Correction (PFC) Abnormality (F90)Malfunction Decision Conditions:During startup and operation of cooling and heating, when PFC protection circuitry at the outdoor unit main PCB senses abnormal high DC voltage level.

Malfunction Caused:1. DC voltage peak due to power supply surge. 2. DC voltage peak due to compressor windings not uniform. 3. Faulty outdoor unit PCB.

Abnormality Judgment:Continue 4 times in 10 minutes.

Power Factor Correction (PFC) Abnormality (F90)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the supply voltage

No Supply voltage as specified? Yes Operate the system. Verify PFC abnormality by measuring DC voltage between P(+) and N(-) terminal at the outdoor unit PCB. Correct the power supply.

Check the compressor winding resistance: - Turn off the power supply and disconnect the harnesses U, V, and W - Measure the winding resistance between UV, V-W, and W-U

Are the compressors winding resistance (U-V, V-W, U-W) uniform?

No Replace the compressor.

Is the DC voltage between P(+) and N(-) terminal normal (between 285-315Vdc)? No

Yes

- Defect in PFC circuitry - Replace the outdoor unit PCB

Yes

Replace the outdoor unit PCB.

Refrigeration Cycle Abnormality (F91)Malfunction Decision Conditions:1. During cooling, compressor frequency = Fcmax. 2. During heating, compressor frequency > Fhrated. 3. During cooling and heating operation running current: 0.65A < I < 1.65A. 4. During cooling, indoor intake indoor pipe < 4oC. 5. During heating, indoor pipe indoor intake < 5oC.

Malfunction Caused:1. Refrigerant shortage (refrigerant leakage). 2. Poor compression performance of compressor. 3. 2/3 way valve closed. 4. Detection error due to faulty indoor intake air or indoor pipe temperature sensors.

Abnormality Judgment:Continue 2 times in 20 minutes.

Refrigeration Cycle Abnormality (F91)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the indoor air intake and pipe temperature sensors. No

Does it conform to the sensor characteristic chart? Yes

Replace the indoor intake air or pipe temperature sensor.

Capillary tube or dryer clogged? No

Yes

Replace the capillary tube or dryer.

Yes 2/3 way valve closed? No Check for gas leakage. Open the 2/3 way valve

Charge for a specified amount of fresh refrigerant. Yes

Refrigeration cycle abnormality error again? Yes Repair the pipe flare or union nuts. Reclaim and recharge refrigerant. No

-Replace outdoor unit PCB - Compressor Procedure complete

Oil oozing out from the 2/3 way valve? No

Compressor Rotation Failure (F93)Malfunction Decision Conditions:A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit.

Malfunction Caused:1. Compressor terminal disconnect. 2. Outdoor PCB malfunction.

Abnormality Judgment:Continue 2 times in 20 minutes.

Compressor Rotation Failure (F93)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Turn off power supply. Disconnect U, V, and W wires.

Check with inverter checker.

No Normal? Yes

- IPM defective - Replace outdoor unit PCB

Replace compressor.

Cooling High Pressure Abnormality (F95)Malfunction Decision Conditions:During operation of cooling, when outdoor unit heat exchanger high temperature data (61oC) is detected by the outdoor pipe temperature sensor.

Malfunction Caused:1. Outdoor pipe temperature rise due to short circuit of hot discharge air flow. 2. Outdoor pipe temperature rise due to defective of outdoor fan motor. 3. Outdoor pipe temperature rise due to defective outdoor pipe temperature sensor. 4. Outdoor pipe temperature rise due to defective outdoor unit PCB.

Abnormality Judgment:Continue 4 times in 20 minutes.

Cooling High Pressure Abnormality (F95)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the outdoor unit installation condition (during cooling or softdry operation) Yes - Reinstall the outdoor unit - Remove the obstacle(s) - Clean the outdoor heat exchanger Replace the outdoor fan motor.

Is there any improper heat radiation? No Is outdoor fan motor operating? Yes Check the outdoor pipe temperature sensor.

No

Does it conform to the sensor characteristic chart? Yes

No

Replace the outdoor pipe temperature sensor.

Replace outdoor unit PCB.

IPM Overheating (F96)Malfunction Decision Conditions:During operation of cooling and heating, when IPM temperature data (100oC) is detected by the IPM temperature sensor.

Malfunction Caused:1. IPM overheat due to short circuit of hot discharge air flow. 2. IPM overheat due to defective of outdoor fan motor. 3. IPM overheat due to defective of internal circuitry of IPM. 4. IPM overheat due to defective IPM temperature sensor.

Abnormality Judgment:Continue 4 times in 30 minutes.

IPM Overheating (F96)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the outdoor unit installation condition (during cooling or softdry operation) Yes - Reinstall the outdoor unit - Remove the obstacle(s) - Clean the outdoor heat exchanger Replace the outdoor fan motor.

Is there any improper heat radiation? No Is outdoor fan motor operating? Yes

No

- Defect in IPM - Replace the outdoor unit PCB

Compressor Overheating (F97)Malfunction Decision Conditions:During operation of cooling and heating, when compressor tank temperature data (112oC) is detected by the compressor tank temperature sensor.

Malfunction Caused:1. Refrigerant shortage (refrigerant leakage). 2. 2/3 way valve closed. 3. Detection error due to faulty compressor tank temperature sensor.

Abnormality Judgment:Continue 4 times in 30 minutes.

Compressor Overheating (F97)Troubleshooting:For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Check the compressor tank temperature sensor. No

Does it conform to the sensor characteristic chart? Yes

Replace the compressor tank temperature sensor.

Capillary tube or dryer clogged? No

Yes

Replace the capillary tube or dryer.

Yes 2/3 way valve closed? No Check for gas leakage. Open the 2/3 way valve

Charge for a specified amount of fresh refrigerant. Yes

Refrigeration cycle abnormality error again? Yes Repair the pipe flare or union nuts. Reclaim and recharge refrigerant. No

-Replace outdoor unit PCB - Compressor Procedure complete

Oil oozing out from the 2/3 way valve? No

Input Over Current Detection (F98)Malfunction Decision Conditions:During operation of cooling and heating, when an input over-current (16.8A) is detected by checking the input current value being detected by current transformer (CT) with the compressor running.

Malfunction Caused:1. Over-current due to compressor failure. 2. Over-current due to defective outdoor unit PCB. 3. Over-current due to defective inverter main circuit electrolytic capacitor. 4. Over-current due to excessive refrigerant

Abnormality Judgment:Continue 3 times in 20 minutes.

Input Over Current Detection (F98)Troubleshooting:Get restarted and measure the input current. No Input current > 16.8A? Yes Turn off power supply. Check the main circuit electrolytic capacitor. NoFor safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Replace the outdoor unit PCB.

Normal? Yes Check refrigerant amount.

Replace the outdoor unit PCB.

Excess refrigerant? No

Yes

Reclaim and recharge with correct amount of refrigerant. Replace outdoor unit PCB.

Output Over Current Detection (F99)Malfunction Decision Conditions:During operation of cooling and heating, when an output over-current (18.5A) is detected by checking the current that flows in the inverter DC Peak sensing circuitry.

Malfunction Caused:1. DC peak due to compressor failure. 2. DC peak due to defective power transistor(s). 3. DC peak due to defective outdoor unit PCB.

Abnormality Judgment:Continue for 7 times (each time within 30 seconds).

Output Over Current Detection (F99)Troubleshooting:Get restarted and measure the input current. No Input current > 18.5A? Yes Check the compressor winding resistance: - Turn off the power and disconnect the harnesses U, V, and W - Measure the winding resistance between U-V, V-W, and W-U Are the compressors winding resistance (U-V, VW, or U-W) shorted? NoFor safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.

Replace the outdoor unit PCB.

Yes

- Compressor defective due to winding shorted - Replace compressor

- Outdoor electronic circuit defect due to power transistor short - Replace the outdoor unit PCB

Thank You