Page 1 STANDARD & EXTREME HEAT SINGLE-ZONE CONDENSER (230V MODELS) SERVICE MANUAL Models Covered: ACiQ-06ZPL-HP230C ACiQ-09ZS-HP230C ACiQ-09ZPL-HP230C ACiQ-12ZS-HP230C ACiQ-12ZPL-HP230C ACiQ-18ZS-HP230C ACiQ-18ZPL-HP230C ACiQ-24ZS-HP230C ACiQ-24ZPL-HP230C ACiQ-30Z-HP230C ACiQ-36ZPL-HP230C ACiQ-36Z-HP230C ACiQ-48ZPL-HP230C ACiQ-60ZPL-HP230C VERSION DATE: 2-09-25...
Page 3 Table of Contents §. Safety Precautions Precautions Information servicing §. Model Reference & External Appearance Model Reference External Appearance §. Outdoor Unit Dimensional Drawings Service Space Capacity Correction Factor for Height Difference Noise Criterion Curves Refrigerant Cycle Diagrams Electrical Wiring Diagrams §.
Page 5 Safety Precautions Contents Precautions ......................2 Information servicing(For flammable materials) ..........4...
Page 6 1. Precautions CAUTION To prevent personal injury, or property or unit damage, • While unpacking be careful of sharp edges around adhere to all precautionary measures and instructions the unit as well as the edges of the fins on the con- denser and evaporator.
Page 7 tested prior to refrigerant charging, according to the following WARNING For Using Flammable Refrigerant requirements: 1. Installation(where refrigerant pipes are allowed) a. The minimum test pressure for the low side of the system shall - Any person who is involved with working on or breaking into a be the low side design pressure and the minimum test pressure refrigerant circuit should hold a current valid certificate from an for the high side of the system shall be the high side design pres-...
Page 8 2. Information servicing(For hot work. A degree of ventilation shall continue during the period that the work is carried out. The ventilation should flammable materials) safely disperse any released refrigerant and preferably expel it externally into the atmosphere. Checks to the area Checks to the refrigeration equipment •...
Page 9 2.12 Cabling national codes. For appliances containing flammable refrigerants, the system shall be purged with oxygen- free nitrogen to render the appliance safe for flammable • Check that cabling will not be subject to wear, corrosion, refrigerants. This process might need to be repeated several excessive pressure, vibration, sharp edges or any other times.
Page 10 used correctly; • The recovered refrigerant shall be processed according to local legislation in the correct recovery cylinder, and • the recovery process is supervised at all times by a the relevant waste transfer note arranged. Do not mix competent person; refrigerants in recovery units and especially not in cylinders.
Page 11 Model Reference Contents Model Reference ....................2 External Appearance .....................3...
Page 12 1. Model Reference Outdoor Unit Model Capacity (Btu/h) Power Supply ACiQ-06ZPL-HP230C 6k Extreme Heat ACiQ-09ZS-HP230C ACiQ-09ZPL-HP230C 9k Extreme Heat ACiQ-12ZS-HP230C ACiQ-12ZPL-HP230C 12k Extreme Heat ACiQ-18ZS-HP230C ACiQ-18ZPL-HP230C 18k Extreme Heat 1Ph, 208/230V~, 60Hz ACiQ-24ZS-HP230C ACiQ-24ZPL-HP230C 24k Extreme Heat ACiQ-30Z-HP230C ACiQ-36Z-HP230C ACiQ-36ZPL-HP230C...
Page 13 2. External Appearance Outdoor Unit 6k Extreme Heat/9k/12k 36k Extreme Heat 9k Extreme Heat/12k Extreme Heat 48k/48k Extreme Heat/60k/60k Extreme Heat 18k/18k Extreme Heat 24k/24k Extreme Heat/30k/36k  Model Reference ...
Page 14 Outdoor Unit Contents Dimensional Drawings ..................2 Installation location ....................9 Capacity Correction Factor for Height Difference ..........10 Noise Criterion Curves ..................17 Refrigerant Cycle Diagrams ................22 Electrical Wiring Diagrams ..................30...
Page 15 1. Dimensional Drawings Please check the corresponding dimensional drawing according to the panel plate. Outdoor Unit Model Panel Plate ACiQ-06ZPL-HP230C X230 ACiQ-09ZS-HP230C X230 ACiQ-09ZPL-HP230C X330 ACiQ-12ZS-HP230C X230 ACiQ-12ZPL-HP230C X330 ACiQ-18ZS-HP230C X430 ACiQ-18ZPL-HP230C X430 ACiQ-24ZS-HP230C ACiQ-24ZPL-HP230C ACiQ-30Z-HP230C ACiQ-36Z-HP230C X630 ACiQ-36ZPL-HP230C ACiQ-48ZPL-HP230C ACiQ-60ZPL-HP230C ...
Page 16 X230 Platform  Outdoor Unit 3 ...
Page 17 X330 Platform  Outdoor Unit 4 ...
Page 18 X430 Platform  Outdoor Unit 5 ...
Page 19 D30 Platform  Outdoor Unit 6 ...
Page 20 X630 Platform  Outdoor Unit 7 ...
Page 21 E30 Platform  Outdoor Unit 8 ...
Page 22 Installation location 20in(500mm) or more when front and sides of the unit are clear 20in (500mm) or more when front and sides of the unit are clear 20in(500mm) or more 20in (500mm) when any 2 or more sides of left, right when any 2 sides of left, right and rear of the unit...
Page 23 3. Capacity Correction Factor for Height Difference Capacity(Btu/h) 6k~9k Pipe Length (ft/m) Cooling 24.6/7.5 32.8/10 65.6/20 82/25 15/49.2 0.975 0.911 Indoor Upper 32.8/10 0.985 0.985 0.920 than Outdoor 16.4/5 0.995 0.995 0.995 0.929 Height difference 1.000 1.000 1.000 0.934 H (ft/m) -16.4/-5 1.000 1.000...
Page 24 Capacity(Btu/h) Pipe Length (ft/m) Cooling 24.6/7.5 32.8/10 65.6/20 98.4/30 65.6/20 0.941 0.919 Indoor Upper 32.8/10 0.974 0.951 0.928 than Outdoor 16.4/5 0.995 0.983 0.960 0.937 Height difference 1.000 0.988 0.965 0.942 H (ft/m) -16.4/-5 1.000 0.988 0.965 0.942 Outdoor Upper -32.8/-10 0.988 0.965...
Page 25 Capacity Pipe Length (ft/m) (Btu/h) Cooling 24.6/7.5 32.8/10 65.6/20 98.4/30 131.2/40 164/50 82/25 0.917 0.898 0.879 65.6/20 0.946 0.926 0.907 0.887 Indoor Upper than Outdoor 32.8/10 0.975 0.955 0.936 0.916 0.896 16.4/5 0.995 0.985 0.965 0.945 0.925 0.905 1.000 0.990 0.970 0.950 0.930...
Page 26 Capacity Pipe Length (ft/m) (Btu/h) Cooling 24.6/7.5 32.8/10 65.6/20 98.4/30 131.2/40 164/50 82/25 0.891 0.862 0.832 65.6/20 0.930 0.900 0.871 0.841 Indoor Upper than Outdoor 32.8/10 0.970 0.940 0.910 0.879 0.849 Height 16.4/5 0.995 0.980 0.949 0.919 0.888 0.858 difference 1.000 0.985 0.954...
Page 27 Capacity Pipe Length (ft/m) (Btu/h) Cooling 24.6/7.5 15/49.2 82/25 35/114.8 164/50 213.3/65 75/246 98.4/30 0.889 0.851 0.812 0.787 Indoor Upper 65.6/20 0.924 0.898 0.859 0.821 0.795 than Out- 32.8/10 0.959 0.933 0.907 0.868 0.829 0.803 door Height 16.4/5 0.995 0.969 0.942 0.916 0.876...
Page 28 Capacity Pipe Length (ft/m) (Btu/h) Cooling 24.6/7.5 15/49.2 82/25 35/114.8 164/50 246/75 98.4/30 0.884 0.843 0.775 65.6/20 0.920 0.893 0.852 0.783 Indoor Upper than Outdoor 32.8/10 0.957 0.930 0.902 0.860 0.791 16.4/5 0.995 0.967 0.939 0.911 0.869 0.799 Height difference 1.000 0.972 0.944...
Page 29 Capacity Pipe Length (ft/m) (Btu/h) Cooling 24.6/7.5 15/49.2 82/25 35/114.8 164/50 246/75 98.4/30 0.870 0.823 0.743 65.6/20 0.911 0.879 0.831 0.751 Indoor Upper than Outdoor 32.8/10 0.953 0.920 0.888 0.840 0.758 16.4/5 0.995 0.962 0.930 0.897 0.848 0.766 Height difference 1.000 0.967 0.934...
Page 30 -Reference acoustic pressure OdB=20µPa -Sound level will vary depending on arrange off actors such as the construction (acoustic absorption coefficient) of particular room in which the equipment is installed. -The operating conditions are assumed to be standard. ACiQ-09ZS-HP230C ACiQ-12ZS-HP230C  Outdoor Unit 17...
Page 31 ACiQ-18ZS-HP230C ACiQ-24ZS-HP230C ACiQ-30Z-HP230C ACiQ-36Z-HP230C  Outdoor Unit 18 ...
Page 32 ACiQ-06ZPL-HP230C ACiQ-09ZPL-HP230C ACiQ-12ZPL-HP230C ACiQ-18ZPL-HP230C  Outdoor Unit 19 ...
Page 33 ACiQ-24ZPL-HP230C ACiQ-36ZPL-HP230C ACiQ-48ZPL-HP230C ACiQ-60ZPL-HP230C  Outdoor Unit 20 ...
Page 34  Outdoor Unit 21 ...
Page 35 5. Refrigerant Cycle Diagrams Pipe Size (Diameter:ø) Piping length (ft/m) Elevation (ft/m) inch(mm) Model No. Additional Refrigerant Liquid Rated Max. Rated Max. ACiQ-06ZPL-HP230C ACiQ-09ZS-HP230C ACiQ-09ZPL-HP230C 3/8(9.52) 1/4(6.35) 24.6/7.5 82/25 49.2/15 0.16oz/ft (15g/m) ACiQ-12ZS-HP230C ACiQ-12ZPL-HP230C  Outdoor Unit 22 ...
Page 36 Pipe Size (Diameter:ø) Piping length (ft/m) Elevation (ft/m) inch(mm) Model No. Additional Refrigerant Liquid Rated Max. Rated Max. ACiQ-18ZS-HP230C 1/2(12.7) 1/4(6.35) 24.6/7.5 98.4/30 65.6/20 0.16oz/ft (15g/m) ACiQ-18ZPL-HP230C  Outdoor Unit 23 ...
Page 37 Pipe Size (Diameter:ø) Piping length (ft/m) Elevation (ft/m) inch(mm) Model No. Additional Refrigerant Liquid Rated Max. Rated Max. ACiQ-24ZS-HP230C 5/8(16) 3/8(9.52) 24.6/7.5 164/50 82/25 0.32oz/ft (30g/m)  Outdoor Unit 24 ...
Page 38 Pipe Size (Diameter:ø) Piping length (ft/m) Elevation (ft/m) inch(mm) Model No. Additional Refrigerant Liquid Rated Max. Rated Max. ACiQ-24ZPL-HP230C 5/8(16) 3/8(9.52) 24.6/7.5 164/50 82/25 0.32oz/ft (30g/m) ACiQ-30Z-HP230C  Outdoor Unit 25 ...
Page 39 Pipe Size (Diameter:ø) Piping length (ft/m) Elevation (ft/m) inch(mm) Model No. Additional Refrigerant Liquid Rated Max. Rated Max. ACiQ-36Z-HP230C 5/8(16) 3/8(9.52) 24.6/7.5 246/75 98.4/30 0.32oz/ft (30g/m)  Outdoor Unit 26 ...
Page 40 Pipe Size (Diameter:ø) Piping length (ft/m) Elevation (ft/m) inch(mm) Model No. Additional Refrigerant Liquid Rated Max. Rated Max. ACiQ-36ZPL-HP230C ACiQ-48ZPL-HP230C 3/4(19) 3/8(9.52) 24.6/7.5 246/75 98.4/30 0.32oz/ft (30g/m) ACiQ-60ZPL-HP230C  Outdoor Unit 27 ...
Page 41  Outdoor Unit 28 ...
Page 42  Outdoor Unit 29 ...
Page 43 6. Electrical Wiring Diagrams ODU Model ODU Wiring Diagram ODU Main Printed Circuit Board ACiQ-06ZPL-HP230C ACiQ-09ZS-HP230C ACiQ-09ZPL-HP230C 16022000040311 17122000057661 ACiQ-12ZS-HP230C ACiQ-12ZPL-HP230C ACiQ-18ZS-HP230C 17122000048066 ACiQ-18ZPL-HP230C 16022000040313 17122000048064 ACiQ-24ZS-HP230C ACiQ-24ZPL-HP230C 16022000040331 ACiQ-30Z-HP230C ACiQ-36Z-HP230C 16022000040650 17122300007152 ACiQ-36ZPL-HP230C 16022000040733 ACiQ-48ZPL-HP230C 16022000040730 ACiQ-60ZPL-HP230C  Outdoor Unit 30...
Page 50 Outdoor unit printed circuit board diagram: 17122000057661...
Page 51 Name Meaning TESTPORT used for testing CN31 connect to electric expansion valve (Output:0~2V DC) DC-FAN connect to DC fan (Output: 0~310V AC). connect to pipe temp. sensor T3, ambient temp. sensor T4, exhaust TP T4 T3 CN21 temp. sensor TP (Output: 0~5V DC) HEAT1 CN17 connect to compressor heater (Output: 230V AC).
Page 52 Outdoor unit printed circuit board diagram: 17122000048064 & 17122000048066 RC 2 VU B...
Page 53 Name Meaning Earth: connect to Ground Power Supply N_in: connect to N-line (230V AC input) L_in: connect to L-line (230V AC input) S: connect to indoor unit communication(230V AC input) 4-WAY CN60 connect to 4 way valve(Output: 230V AC) AC-FAN connect to AC fan HEAT2 CN19...
Page 54 Outdoor unit printed circuit board diagram: 17122300007152...
Page 55 Name Meaning COMPRESSOR connect to compressor(Output: 0~310V AC) DC-FAN1 CN32 connect to DC fan(Output: 0~310V AC) TESTPORT CN45 used for testing HEAT_Y CN38 connect to compressor heater(Output: 230V AC) CN37 connect to 4 way valve 1(Output: 230V AC) 4-WAY CN25 connect to 4 way valve 2(Output: 230V AC) CN42 connect to 4 way valve 3(Output: 230V AC)
Page 56 Name Meaning EEVA CN17 EEVB CN16 EEVC CN22 EEVD CN14 EEVE CN13 connect to electric expansion valve(Output: 0~12V DC) EEVF EEV1 CN53 EEV2 CN44 EEV3 H_YL CN49 connect to high pressure sensor DC-FAN2 CN10 connect to DC fan(Output: 0~310V AC) Note: This section is for reference only.
Page 57 Installation Contents Accessories Location Selection Outdoor Unit Installation Refrigerant Pipe Installation Vacuum Drying and Leakage Checking Additional Refrigerant Charge Engineering of Insulation Engineering of Electrical Wiring Test Operation...
Page 58 1. Accessories Name Shape Quantity Drain joint Seal 2. Location selection 2.1 Unit location selection can refer to installation manual. 2.2 DO NOT install the unit in the following NOTE locations: H: Unit height L: Height of the wall behind the unit •...
Page 59 3. Outdoor unit installation 3.1 Install drain joint(Heat pump unit only) Before bolting the outdoor unit in place, you must install the drain joint at the bottom of the unit. Note that there are two different types of drain joints depending on the type of outdoor unit.
Page 60 4. Refrigerant Pipe Installation Indoor unit/ Outdoor unit 4.1 Maximum length and drop height Ensure that the length of the refrigerant pipe, the number of bends, and the drop height between the indoor and outdoor units meets the requirements shown in the following table.
Page 61 5. Vacuum Drying and Leakage Flare dimension A Pipe diameter (inch/mm) Flare shape Checking (inch(mm)) 5.1 Purpose of vacuum drying Ø1/4 (Ø6.35) 0.33/8.4 0.34/8.7 • Eliminating moisture in system to prevent the phe- Ø3/8 (Ø9.52) 0.52/13.2 0.53/13.5 nomena of ice-blockage and copper oxidation. 90 °...
Page 62 4. Rain water might penetrate into pipeline during 6. Additional Refrigerant Charge construction. • After the vacuum drying process is carried out, the additional refrigerant charge process need to be performed. Procedures of special vacuum drying are as follows: • The outdoor unit is factory charged with refrigerant.
Page 63 7 . Engineering of Insulation Engineering of Electrical Wring 7.1 Insulation of refrigerant pipe 1. Highlights of electrical wiring installation 1. Operational procedure of refrigerant pipe • All wiring must comply with local and national insulation electrical codes, regulations and must be installed by a licensed electrician.
Page 64 Table: Minimum Cross-Sectional Area able of Power and 9. Test Operation Signal Cables 1. The test operation must be carried Rated Current of out after the entire installation has been Appliance (A) completed. ≤ 6 6 - 10 2. Please confirm the following points 10 - 16 before the test operation.
Page 65 b. Turn on the main power switch and run the air conditioner in COOL mode. c. Check to see that the water is discharged. It may take up to one minute before the unit begins to drain depending on the drainpipe. d.
Page 66 Basic Functions Contents 1. Basic Functions ....................2 Abbreviation ......................2 Fan Mode ......................... 2 Cooling Mode ......................2 Heating Mode(Heat Pump Units) ................2...
Page 67 1. Basic Functions • When indoor room temperature(T1) is lower than or equal to (Tsc-CDIFTEMP). Note: CDIFTEMP is EEPROM setting parameter. It is Abbreviation 2°C(4°F) usually. Unit element abbreviations 3) If one of the following conditions is satisfied, not judge protective time.
Page 68 2°C(4°F) usually. • If condenser temperature(T3) or outdoor ambient temperature(T4) is lower than -3°C for 30 seconds • If one of the following conditions is satisfied, not and compressor running time is more than EE_ judge protective time. TIME_DEFROST7+30 minutes. •...
Page 69 Troubleshooting Contents 1. Safety Caution ..................... 3 2. General Troubleshooting ................4 Error Display(For models with auxiliary boards) ............4 3. Outdoor Unit Point Check Function ............6 4. Quick Maintenance by Error Code ............... 8 5. Troubleshooting by Error Code ..............10 EC 51 (ODU EEPROM parameter error diagnosis and solution) .........
Page 70 Troubleshooting Contents 5.12 PC 02/LC 06 (Compressor top(or IPM) temp. protection/Refrigerant sensor error diagnosis and solution) ........................27 5.13 PC 30 (System high pressure protection diagnosis and solution) ........ 29 5.14 PC 31 (System low pressure protection diagnosis and solution) ......... 31 5.15 EC 72 (Lack phase failure of outdoor DC fan motor diagnosis and solution) ....
Page 71 1. Safety Caution WARNING Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. While checking indoor/outdoor PCB, please equip oneself with antistatic gloves or wrist strap to avoid damage to the board. WARNING Electricity remains in capacitors even when the power supply is off.
Page 72 2. General Troubleshooting Error Display(For models with auxiliary boards) Display Malfunction or Protection Solution Defrosting Normal Display, not Forced cooling error code ODU fan speed out of control TS14 EC 07 Over current failure of outdoor DC fan motor TS14 EC 71 Lack phase failure of outdoor DC fan motor TS34...
Page 73 System low pressure protection TS31 PC 31 Communication error between ODU main chip and compressor driven chip TS23 PC 40 Compressor start failure of outdoor unit TS17 PC 42 ODU compressor lack phase protection TS34 PC 43 ODU zero speed protection TS17 PC 44 ODU IR chip drive failure...
Page 74 3. Outdoor Unit Point Check Function • A check switch is included on the auxiliary 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 75 Frequency limit caused by IGBT The display value is a Bit7 radiator hexidecimal number. Bit6 Frequency limit caused by PFC For example, the Frequency limit caused by high digital display show Bit5 temperature of T2. 2A, then Bit5=1, Frequency limit caused by low Frequency limit symbol Bit4 Bit3=1, and Bit1=1.
Page 76 4. 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 EL 01...
Page 77 Error Code Part requiring replacement PC 40 EC 72 PC 43 PC 45 Pc 06 Pc 0a PC 30 pc 31 Outdoor PCB Outdoor fan motor ODU coil temp. sensor COMP. discharge temp. sensor Compressor IPM module board Additional refrigerant Electric control box High pressure switch Low pressure switch...
Page 78 5. Troubleshooting by Error Code EC 51 (ODU 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 79 EL 01(IDU & ODU communication error diagnosis and solution) Description: Indoor unit can not communicate with outdoor unit Recommended parts to prepare: • Indoor PCB • Outdoor PCB • Reactor Troubleshooting and repair: Current loop Communication(S Communication): Power off, then restart the unit after 2 minutes.
Page 80 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 81 485 Communication(S1,S2 Communication): Recommended parts to prepare: • Signal wires • Magnet ring • Indoor PCB • Outdoor PCB Troubleshooting and repair: Power off, then restart the unit 2 minutes later Check whether there’s any interference. Remove interference or Such as too many lamps , power add magnet ring on power transformers? Or the signal wire wire...
Page 82 EC 07 (ODU fan speed out of control)/EC 71(Over Current 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 LED displays the failure code and the AC turns off.
Page 83 Index: 1. Outdoor DC Fan Motor(control chip is in fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 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 84 EC 52/EC 53/EC 54/EC 56/EC 57/EC 50 (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 code. Recommended parts to prepare: •...
Page 85 PC 08(Current overload protection)/PC 42(Compressor start failure of outdoor unit)/PC 44(ODU zero speed protection) /PC 46(Compressor speed has been out of control)/PC 49(Compressor overcurrent failure) Description: An abnormal current rise is detected by checking the specified current detection circuit. Recommended parts to prepare: •...
Page 86 Was the protection activated in standby? Is the power voltage is Restart the unit when the power normal? supply returns to normal Is outdoor terminal voltage Is the power wiring Reconnect the normal？ wired correctly? power wiring Is the voltage between L and Are L and N wired Reconnect L and N properly?
Page 87 PC 00(IPM malfunction diagnosis and solution) Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the LED displays the failure code and the AC turns off. Recommended parts to prepare: • Connection wires • IPM module board •...
Page 88 Restart the unit when the power supply Is the power voltage normal? returns to normal Is the outdoor terminal voltage Are the power wires Reconnect the power normal？ connected properly? wires Is the voltage between L and N Are L and N wired Reconnect L and N normal？...
Page 89 PC 01(Over voltage or too low voltage protection)/PC 10(ODU low AC voltage protection)/PC 11(ODU main control board DC bus high voltage protection)/PC 12(ODU main control board DC bus low voltage protection /341 MCE error) Diagnosis and Solution Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit. Recommended parts to prepare: •...
Page 90 Check whether the power Restart the unit when the power voltage is normal . supply gets normal Check the wiring of Measure whether outdoor power wires well or Reconnect it well terminal voltage is normal？ correctly Check the wiring of Measure whether the voltage L and N well or Reconnect it well...
Page 91 PC 40(Communication error between ODU main chip and compressor driven chip diagnosis and solution) Description: The main PCB cannot detect the IPM board. Recommended parts to prepare: • Connection wires • Outdoor PCB • IPM module board • Electric control box Troubleshooting and repair: Is there at least one LED in the IPM board light?
Page 92 PC 0F(PFC module protection diagnosis and solution) Description: Outdoor PCB detects PFC signal is low voltage or DC voltage is lower than 340V for 6s when quick check. Recommended parts to prepare: • Connection wires • Outdoor PCB • Inductance •...
Page 93 5.10 PC 06(Discharge temperature protection of compressor diagnosis and solution) Description: When the compressor discharge temperature (TP) is more than 115 C for 10 seconds, the compressor ceases operation and does not restart until TP is less than 90 Recommended parts to prepare: •...
Page 94 5.11 PC 0A(High temperature protection of condenser diagnosis and solution) Description: The unit will stop when condenser temperature is higher than 65°C, and runs again when it is less than 52°C Recommended parts to prepare: • Connection wires • Condenser temperature sensor •...
Page 95 5.12 PC 02/LC 06 (Compressor top(or IPM) temp. protection/Refrigerant sensor error diagnosis and solution) Description: For some models with overload protector, 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. Models without overload protector should be diagnosed according to the second flowchart.
Page 96 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. Check the connection between refrigerant sensor and PCB. Is it properly wired? Ensure proper connections. Replace the sensor.
Page 97 5.13 PC 30 (System 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: ...
Page 98 Are the high pressure Connect high pressure switch switch and main control and mian control board boar wired correctly? Is the high pressure protector broken? Method: Disconnect the plug. Measure the resistance of high pressure protector , if Replace high pressure protector the protector is normal the value is o, Does a problem still exist?
Page 99 5.14 PC 31 (System low pressure protection diagnosis and solution) Description: Outdoor pressure switch cut off the system because low pressure is lower than 0.13 MPa, the LED displays the failure code. Recommended parts to prepare: • Connection wires • Outdoor PCB •...
Page 100 Are the low pressure Reconnect the low pressure protector and main control protector and main control board board wired properly? Is the low pressure protector broken? Method: Disconnect the plug. Measure the resistance of the low pressure Replace low pressure protector protector.
Page 101 5.15 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 102 5.16 PC 43 (ODU 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 103 5.17 PC 45 (ODU 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 104 5.18 EC 55(ODU IPM module temperature sensor malfunction diagnosis and solution) Description: If the sampling voltage is 0V or 5V, the LED displays the failure code. Recommended parts to prepare: • IPM module PCB • Connection wires • Sensors • Outdoor main PCB Troubleshooting and repair: If the radiator has no sensor, follow the steps below to resolve, Power off, then restart the unit after 2 minutes.
Page 105 5.19 PH 90(High temperature protection of evaporator diagnosis and solution) Description: When evaporator coil temperature is more than 60°C in heating mode, the unit stops. It starts again only when the evaporator coil temperature is less than 52°C. Recommended parts to prepare: •...
Page 106 5.20 PH 91(Low temperature protection of evaporator diagnosis and solution) Description: When evaporator coil temperature is lower than 0°C in cooling mode or drying mode, the unit stops. It starts again only when the evaporator coil temperature is more than 5°C. Recommended parts to prepare: •...
Page 107 6. Check Procedures 6.1 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 the temperature sensor from PCB (Refer to Chapter 5&6. Indoor&Outdoor Unit Disassembly). 2.
Page 108 Resistance Value KSK103D33UEZ3 KSN140D58UFZ KTF250D22UMT KTN110D42UFZ KTF420D62UNT Blue-Red Blue-Black 2.13Ω 1.86Ω 0.75Ω 1.82Ω 0.86Ω Red-Black ETPQ420D1UMUA ETPQ440D1UMUB Resistance Value KTN150D30UFZA KTM240D46UKT2 KTF310D43UMT MTH356UKRC8FQL KTQ420D1UMU EKPQ440D1UMUB Blue-Red Blue-Black 1.02Ω 1.04Ω 0.65Ω 0.37Ω 0.487Ω Red-Black Resistance Value MTH550UKPC8FU Blue-Red Blue-Black 0.295Ω Red-Black Note: The picture and the value are only for reference, actual condition and specific value may vary.
Page 109 IPM Continuity Check WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. 1. Turn off outdoor unit and disconnect power supply. 2. Discharge electrolytic capacitors and ensure all energy-storage unit has been discharged. 3.
Page 110 Note: The picture and the value are only for reference, actual condition and specific value may vary. Normal voltage of P and N 208-230V(1-phase) In standby around 310VDC In operation With passive PFC module With partial active PFC With fully active PFC module module >200VDC...
Page 111 4-way valve Check 1.Power on, use a digital tester to measure the voltage, when the unit operates in cooling, it is 0V. When the unit operates in heating, it is about equal to power supply voltage. If the value of the voltage is not in the range, the PCB must have problems and need to be replaced. 2 Turn off the power, use a digital tester to measure the resistance.
Page 112 Troubleshooting  ...
Page 113 Appendix Contents Temperature Sensor Resistance Value Table for TP (°C --K) ........2 Other Temperature Sensors Resistance Value Table (°C – K) ......3 iii) System Pressure Table ...................4...
Page 114 i) Temperature Sensor Resistance Value Table for TP (°C --K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 542.7 68.66...
Page 115 ii) Other Temperature Sensors Resistance Value Table (°C – K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5 2.19073 0.59386 96.3423 10.9731 2.11241 0.57683 89.5865...
Page 116 iii) System Pressure Table-R454B Pressure Temperature Pressure Temperature °C °F °C °F 58.196 0.58 8.44 935.23 9.35 135.64 46.4 61.517 0.62 8.92 -74.2 963.75 9.64 139.78 48.2 64.988 0.65 9.43 -72.4 992.93 9.93 144.01 68.615 0.69 9.95 -70.6 1022.8 10.23 148.34 51.8 72.402...
Page 117 422.31 4.22 61.25 2956.5 29.57 428.79 125.6 437.92 4.38 63.51 3025 30.25 438.72 127.4 453.98 4.54 65.84 3094.7 30.95 448.83 129.2 470.47 4.70 68.23 3165.7 31.66 459.13 487.43 4.87 70.69 10.4 3238.1 32.38 469.63 132.8 504.84 5.05 73.22 12.2 3311.7 33.12 480.30 134.6...
Page 118 The design and specifications are subject to change without prior notice for product improvement. Consult with the sales agency or manufacturer for details. Any updates to the manual will be uploaded to the service website, please check for the latest version. Std.

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