ACPro Y Series Troubleshooting Manual

Hide thumbs

Table Of Contents

Quick Links

Y-Series

Troubleshooting Guide

Rev. 08.26.2022

Table of Contents

Troubleshooting

Need help?

Do you have a question about the Y Series and is the answer not in the manual?

Questions and answers

Summary of Contents for ACPro Y Series

Page 1 Y-Series Troubleshooting Guide Rev. 08.26.2022...
Page 2 This page intentionally left blank...
Page 3: Table Of Contents
TABLE OF CONTENTS General Troubleshooting ........4 Outdoor Unit Point Check Function .
Page 4: General Troubleshooting
2. General Troubleshooting Error Display (Indoor Unit) When the indoor unit encounters a recognized error, the operation lamp will ﬂash in a corresponding series, the timer lamp may turn on or begin ﬂashing, and an error code will be displayed. These error codes are described in the following table: Display Error Information...
Page 5 Low pressure protection (for some models) TS33 PC 03 Outdoor unit malfunction TS35 ec 0 Low ambient temperature protection TS42 PC 0L Mismatch between the new and old platforms TS48 FL 09 For other errors: The display board may show a garbled code or a code undeﬁned by the service manual. Ensure that this code is not a temperature reading.
Page 6 Error Display (For Some Outdoor Unit) Display Malfunction or Protection Solution Outdoor EEPROM malfunction TS21 EC 51 Indoor / outdoor units communication error TS22 EL 01 EL 16 Communication malfunction between adapter board and outdoor main board TS48 IPM module protection TS30 PC 00 Top temperature protection of compressor or High temperature protection of IPM module...
Page 7: Outdoor Unit Point Check Function
3. Outdoor Unit Point Check Function • A check switch is included on the outdoor PCB. • Push SW1 to check the unit’s status while running. The digital display shows the following codes each time the SW1 is pushed. Number of Display Remark Presses...
Page 8 Frequency limit caused by The display value is a Bit7 IGBT radiator hexidecimal number. For example, the Bit6 Reserved digital display show Bit5 Reserved 2A, then Bit5=1, Frequency limit caused by low Bit4 Bit3=1, and Bit1=1. temperature of T2.(LH00) Frequency limit caused by Frequency limit symbol Bit3 This means that a...
Page 9: Information Inquiry
4. Information Inquiry • To enter engineer mode, in power-on or standby mode, and in non-locked state, press the key combination “ON/OFF + Air Speed” for 7s: • After entering the engineer mode, the remote control will display icons of “Auto, Cool, Dry, Heat”, and the Battery icon;...
Page 10 press "On/Off" for 2s to enter Twins Selector, the code displayed is “Ch”, Compressor press "OK" to send the Query Twins Selector code; press the Up/Down key to Running select, 0 indicates that there is no Twins, 1 indicates the host, and 2 indicates Frequency Fr the slave.
Page 11 press "On/Off" for 2s to enter the Cooling Temperature Compensation Value Settings, the code displayed is “Ch”, then press "OK" to send the Query Cooling Temperature Compensation Value code; press the Up/Down key to select the cooling temperature compensation value, then press "OK"; and press "On/Off"...
Page 12 Error code of engineer mode Display Error Information Indoor unit EEPROM parameter error EH 00 Indoor / outdoor unit communication error EL 01 Communication malfunction between adapter board and outdoor main board EL 16 The indoor fan speed is operating outside of the normal range EH 03 EC 51 Outdoor unit EEPROM parameter error...
Page 13: Error Diagnosis And Troubleshooting Without Error Code
5. Error Diagnosis and Troubleshooting Without Error Code WARNING Be sure to turn off unit before any maintenance to prevent damage or injury. Remote maintenance SUGGESTION: When troubles occur, please check the following points with customers before ﬁeld maintenance. Problem Solution Unit will not start TS15 - TS16...
Page 14 Field maintenance Problem Solution Unit will not start TS17 - TS18 Compressor will not start but fans run TS17 - TS18 Compressor and condenser (outdoor) fan will not start TS17 - TS18 Evaporator (indoor) fan will not start TS17 - TS18 Condenser (Outdoor) fan will not start TS17 - TS18 Unit runs, but shortly stops...
Page 15 1.Remote Maintenance Electrical Circuit Refrigerant Circuit Possible causes of trouble Unit will not start The power switch is on but fans will not start The temperature on the display board cannot be set Unit is on but the wind is not cold(hot) Unit runs, but shortly stops The unit starts up and stops frequently Unit runs continuously but insufficient cooling(heating)
Page 16 1.Remote Maintenance Others Possible causes of trouble Unit will not start The power switch is on but fans will not start The temperature on the display board cannot be set Unit is on but the wind is not cold(hot) Unit runs, but shortly stops The unit starts up and stops frequently Unit runs continuously but insufficient cooling(heating) Cool can not change to heat...
Page 17 2.Field Maintenance Refrigerant Circuit Others Possible causes of trouble Unit will not start Compressor will not start but fans run Compressor and condenser (outdoor) fan will not start Evaporator (indoor) fan will not start Condenser (Outdoor) fan will not start Unit runs, but shortly stops Compressor short-cycles due to overload High discharge pressure...
Page 18 2.Field Maintenance Electrical Circuit Possible causes of trouble Unit will not start Compressor will not start but fans run Compressor and condenser (outdoor) fan will not start Evaporator (indoor) fan will not start Condenser (Outdoor) fan will not start Unit runs, but shortly stops Compressor short-cycles due to overload High discharge pressure Low discharge pressure...
Page 19: Quick Maintenance By Error Code
6. Quick Maintenance by Error Code If you do not have the time to test which speciﬁc parts are faulty, you can directly change the required parts according the error code. You can ﬁnd the parts to replace by error code in the following table. Error Code Part requiring replacement...
Page 20 Part requiring EL 16 eh 0b pc 06 pc 08/44/ 49 pc 0a pc 0f replacement Indoor PCB Outdoor PCB Outdoor fan motor T3 Sensor TP Sensor Pressure sensor Reactor Compressor IPM module board Data adapter board High pressure valve assy High pressure protector Low pressure protector Additional refrigerant...
Page 21: Troubleshooting By Error Code
7. Troubleshooting by Error Code EH 00 / EC 51 (EEPROM Parameter Error Diagnosis and Solution) Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Recommended parts to prepare: • Indoor PCB • Outdoor PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later.
Page 22 EL 01 (Indoor and Outdoor Unit Communication Error Diagnosis and Solution) Description: Indoor unit can not communicate with outdoor unit Recommended parts to prepare: • Signal wires • Magnet ring • Indoor PCB • Outdoor PCB Troubleshooting and repair: XYE Communication: Power off, then restart the unit 2 Power off, then restart the unit 2 minutes later...
Page 23 S Communication: Power off, then restart the unit after 2 minutes. Does the error code Solved disappear? Check the wiring connection Correct the connection or between indoor and outdoor change wires unit, are they good? The value is alternative from negative to positive Check the wiring connection Measure the DC voltage between N/L2 The value is fixed and close...
Page 24 Remarks: • Use a multimeter to test the DC voltage between 2 port(or S or L2 port) and 3 port(or N or S port) of outdoor unit. The red pin of multimeter connects with 2 port(or S or L2 port) while the black pin is for 3 port(or N or S port) . •...
Page 25 EH 03 / EC 07 (Fan Speed Is Operating Outside of Normal Range)/EC 71(Over Current Failure of Outdoor DC Fan Motor)/ EC73(Zero-speed failure of outdoor DC fan motor) Diagnosis and Solution Description: When indoor / outdoor fan speed keeps too low or too high for a certain time, the unit ceases operation and the LED displays the failure.
Page 26 Index: 1. Indoor DC Fan Motor(control chip is in fan motor) Power on and when the unit is in standby, measure the voltage of pin1&pin2 of CN15, pin3 of CN34 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must has problems and need to be replaced.
Page 27 EH 60/EH 61/EH 62/ EH 65/ EC 53/EC 52/EC 54/EC 56/EC 57/EC 50/EC 5C (Open Circuit or Short Circuit of Temperature Sensor Diagnosis and Solution) Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure. Recommended parts to prepare: •...
Page 28 EL 0C (Refrigerant Leakage Detection Diagnosis and Solution) Description: Judging the abnormality of the refrigeration system according to the number of compressor stops and the changes in operating parameters caused by excessive exhaust temperature. Recommended parts to prepare: • Indoor PCB •...
Page 29 EH 0E(Water-Level Alarm Malfunction Diagnosis and Solution) Description: If the sampling voltage is not 5V, the LED displays the failure code. Recommended parts to prepare: • Connection wires • Water-level switch • Water pump • Indoor PCB Shut off the power supply and Shut off the power supply and turn it on 2 minutes later.
Page 30 PC 00(IPM malfunction or IGBT over-strong current protection Diagnosis and Solution) Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the display LED shows “PC 00” and the AC turn off. Recommended parts to prepare: •...
Page 31 PC 01(Over voltage or too low voltage protection)/PC 10(Outdoor unit low AC voltage protection)/PC 11(Outdoor unit main control board DC bus high voltage protection)/PC 12(Outdoor unit main control board DC bus high voltage protection /341 MCE error) Diagnosis and Solution Description: Abnormal increases or decreases in voltage are detected by checking the speciﬁed voltage detection circuit.
Page 32 PC 04(Inverter compressor drive error Diagnosis and Solution) Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Recommended parts to prepare: • Connection wires •...
Page 33 7.10 PC 03/PC 31(Low Pressure Protection Diagnosis and Solution) Description: If the sampling voltage is not 5V, the LED displays a failure code. Recommended parts to prepare: • Connection wires • Low pressure protector • Indoor fan assembly • Outdoor PCB Troubleshooting and repair: Low pressure protection Low pressure protection...
Page 34 7.11 PC 02/LC 06(Top temperature protection of compressor or High temperature protection of IPM module diagnosis and solution) Description: For some models with overload protection, If the sampling voltage is not 5V, the LED will display the failure. If the temperature of IPM module is higher than a certain value, the LED displays the failure code. Recommended parts to prepare: •...
Page 35 Check the fastening screws on the PCB and IPM radiator. Replace the outdoor Are they fixed tightly? control PCB. Tighten the screws and apply silicon grease. 7.12 EC 0d(Outdoor unit malfunction Diagnosis and Solution) Description: The indoor unit detect the outdoor unit is error. Recommended parts to prepare: •...
Page 36 7.13 PC 40(Communication error between outdoor main PCB and IPM board diagnosis and solution) Description: The main PCB cannot detect the IPM board. Recommended parts to prepare: • Connection wires • IPM board • Outdoor main PCB • Electric control box Troubleshooting and repair: Is there at least one LED in Is there at least one LED in...
Page 37 7.14 PC 08(Current overload protection)/PC 44(Outdoor unit zero speed protection)/ PC 46(Compressor speed has been out of control)/PC 49(Compressor overcurrent failure) diagnosis and solution Description: An abnormal current rise is detected by checking the specified current detection circuit. Recommended parts to prepare: •...
Page 38 Was the protection activated Was the protection activated in standby? in standby? Restart the unit when the power supply Restart the unit when the power supply Is the power voltage is normal? Is the power voltage is normal? returns to normal returns to normal Is outdoor terminal voltage Is the power wiring...
Page 39 7.15 PC 0F PFC module protection diagnosis and solution) Description: When the voltage signal that IPM send to compressor drive chip is abnormal, the LED displays the failure code and the AC turns off. Recommended parts to prepare: • Connection wires •...
Page 40 7.16 EC 72 (Lack phase failure of outdoor DC fan motor diagnosis and solution) Description: When the three-phase sampling current of the DC motor is abnormal, especially when the current of one or more phases is always small and almost 0, the LED displays the failure code. Recommended parts to prepare: •...
Page 41 7.17 PC 43 (Outdoor compressor lack phase protection diagnosis and solution) Description: When the three-phase sampling current of the compressor is abnormal, especially when the current of one or more phases is always small and almost 0, the LED displays the failure code Recommended parts to prepare: •...
Page 42 7.18 PC 45 (Outdoor unit IR chip drive failure diagnosis and solution) Description: When the IR chip detects its own parameter error, the LED displays the failure code when power on. Recommended parts to prepare: • Inverter module PCB. Troubleshooting and repair: Power off,then restart the unit 2 minutes later.
Page 43 7.20 PC 30 (High pressure protection diagnosis and solution) Description: Outdoor pressure switch cut off the system because high pressure is higher than 4.4 MPa Recommended parts to prepare: • Connection wires • Pressure switch • Outdoor fan • Outdoor main PCB Troubleshooting and repair: Troubleshooting 43...
Page 44 High pressure protection High pressure protection Are the high pressure switch Are the high pressure switch Connect high pressure switch and Connect high pressure switch and and main control boar wired and main control boar wired mian control board mian control board correctly? correctly? Is the high pressure...
Page 45 7.21 PC 0A (High temperature protection of condenser diagnosis and solution) Description: When the outdoor pipe temperature is more than 65°C, the unit stops. It starts again only when the outdoor pipe temperature is less than 52°C. Recommended parts to prepare: •...
Page 46 7.22 PC 06 (Discharge temperature protection of compressor diagnosis and solution) Description: If the compressor discharge temperature exceeds a certain level for nine seconds, the compressor ceases operation, the LED displays the failure code Recommended parts to prepare: • Connection wires •...
Page 47 7.23 EH 0b(Communication error between indoor two chips diagnosis and solution) Description: Indoor PCB main chip does not receive feedback from another chip. Recommended parts to prepare: • Indoor main board • Adapter board Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later.
Page 48 7.24 EL 16(Communication malfunction between adapter board and outdoor main board diagnosis and solution) Description: The adapter PCB cannot detect the main control board. Recommended parts to prepare: • Connection wires • Adapter board • Outdoor main PCB Troubleshooting and repair: Power off, then restart the unit after 3 minutes.
Page 49 7.26 PC 41(Outdoor compressor current sampling circuit failure diagnosis and solution) Description: Three-phase sampling offset voltage error, the static bias voltage is normally 2.5V Recommended parts to prepare: • Outdoor main PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later.
Page 50: Check Procedures
8. Check Procedures 8.1 Temperature Sensor Check WARNING Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. Operate after compressor and coil have returned to normal temperature in case of injury. 1. Disconnect temperature sensor from PCB (Refer to Chapter 5. Indoor Disassembly and Chapter 6. Outdoor Disassembly). 2.
Page 51 Resistance Value ASM135D23UFZ ATQ420D1UMU ASN98D22UFZ ATF235D22UMT ATQ360D1UMU Blue-Red Blue-Black 1.75 0.37 0.75 0.37 1.57 Red-Black ATF250D22UMT Resistance Value ATM115D43UFZ2 ATF310D43UMT KSK103D33UEZ3 ASM98D32UFZ KTF250D22UMT Blue-Red Blue-Black 1.87 0.75 0.65 2.13 Red-Black Resistance Value ASN140D21UFZ ASK89D29UEZD KSN140D21UFZ KTM240D57UMT KSN140D58UFZ Blue-Red Blue-Black 1.28 1.99 1.28 0.62...
Page 52 Note: The picture and the value are only for reference, actual condition and speciﬁc value may vary. 8.3 IPM Continuity Check WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. 1.
Page 53 Note: The picture and the value are only for reference, actual condition and speciﬁc value may vary. Normal voltage of P and N 208-240V(1-phase,3-phase) 380-415V(3-phase) In standby around 310VDC around 530VDC In operation With passive PFC module With partial active PFC With fully active PFC module module...
Page 54 NOTES...
Page 55 This page intentionally left blank...
Page 56 The AC Pro Difference No restocking fees AC Pro tech support 855.972.2776 Instant warranty credits Complimentary after-hours service 888.674.4822 Free drop-off for change-out units and job trash HOURS: MON – FRI 6 AM – 5 PM SAT 7 AM – 11AM Anaheim 3060 La Palma Ave.

ACPro Y Series Troubleshooting Manual

Quick Links

Troubleshooting

Need help?

Questions and answers

Related Manuals for ACPro Y Series

Summary of Contents for ACPro Y Series