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Series 4 Models: “Wall” Type Top Class R32 Refrigerant AC

6. TROUBLESHOOTING

WARNING

6.1 Safety Caution

Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.

•

For other models, connect discharge resistance (approx. 100

Ω

40W) or a soldering iron plug between the positi-

ve and negative terminals of the electrolytic capacitor.

• The terminals are located on the bottom surface of the outdoor PCB.

Note: This picture is for reference only. Actual appearances may vary.

Discharging position (discharging period is 10 sec. or more)

Plug of soldering iron

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Summary of Contents for 4 Series

Page 1: ...igerant Wall Type Air Conditioners Heat Pump Top Class Models with DC Fan Motor 1 Phase 220 240V 50 60Hz Power Supply Series 4 Models HKEU 264 ZAL HCNI 264 ZA SERVICE MANUAL Release 1 1 HKEU 354 ZAL HCNI 354 ZA ...

Page 2: ...Type Top Class R32 Refrigerant AC Table of Contents Table of Contents 1 PRODUCT DETAILS 1 2 MODEL REFERENCE 3 3 DIMENSIONS 4 4 ELECTRICAL WIRING DIAGRAMS 6 5 OPERATION MODES AND FUNCTIONS 8 6 TROUBLESHOOTING 14 APPENDIX 37 ...

Page 3: ...ntion Through this function in heating mode it is possible to avoid the introduction of cold air into the room following the defrost cycles Anti freeze function 8 C In the event of prolonged absence a minimum temperature level can be guaranteed inside the rooms By activating the anti freeze function when a temperature lower than 8 C is detected in the room the system starts until this temperature ...

Page 4: ...ng A 1 0 9 2 1 2 9 4 Maximumcurrent A 10 10 Maximumabsorbedpower kW 2 35 2 35 ConnectionwiresbetweenI U andO U no 5 5 Refrigerantcircuit Refrigerant GWP 4 R32 675 R32 675 Quantityrefrigerantpre load Kg 0 87 0 87 TonsofCO2equivalent t 0 587 0 587 Diameterofrefrigerantpipingonliquid gas mm inches ø6 35 1 4 ø9 52 3 8 ø6 35 1 4 ø9 52 3 8 Maxsplittinglength m 25 25 MaxheightdifferenceI U O U m 10 10 Sp...

Page 5: ...oor Unit Model Outdoor Unit Model Capacity Btu h Power Supply 9k 12k HKEU 264 ZAL HCNI 264 ZA HKEU 354 ZAL HCNI 354 ZA Refer to the following table to determine the specific indoor and outdoor unit model number of your purchased equip ment 220 240V 50Hz 1Phase 220 240V 50Hz 1Phase ...

Page 6: ... 4 Series 4 Models Wall Type Top Class R32 Refrigerant AC 3 DIMENSIONS 3 1 Indoor Units Models HKEU 264 ZAL HKEU 354 ZAL Models W mm D mm H mm HKEU 264 ZAL HKEU 354 ZAL 802 189 297 802 189 297 ...

Page 7: ... 5 Series 4 Models Wall Type Top Class R32 Refrigerant AC 3 2 Outdoor Units Models HCNI 264 ZA HCNI 354 ZA Unit mm ...

Page 8: ...oor Units Models HKEU 264 ZAL HKEU 354 ZAL Abbreviation Paraphrase Y G Ground Wire ION Positive and Negative Ion Generator CAP Capacitor PLASMA Electronic Dust Collector L LIVE N NEUTRAL Heater The Electric Heating Belt of Indoor Unit T1 Indoor Room Temperature T2 Coil Temperature of Evaporator ...

Page 9: ...lve Assembly 4 WAY VALVE AC FAN Alternating Current AC FAN DC FAN Direct Current DC FAN CT1 AC Current Detector COMP Compressor L PRO Low Pressure Switch H PRO High Pressure Switch T3 Coil Temperature of Condenser T4 Outdoor Ambient Temperature TH Compressor Suction Temperature TP Compressor Discharge Temperature EEV Electronic Expansion Valve ...

Page 10: ...nd the corresponding error code is displayed on the indoor unit Inverter module protection The inverter module has an automatic shut off mechanism based on the unit s current voltage and temperature If automatic shut off is initiated the corresponding error code is displayed on the indoor unit and the unit ceases operation Indoor fan delayed operation When the unit starts the louver is automatical...

Page 11: ...ute mode the compressor operates at a low frequency When the current exceeds the preset value the current protection function activates and the compressor ceases operation 5 5 2 Indoor Fan Control In cooling mode the indoor fan operates continuously The fan speed can be set to high medium low or auto If the compressor ceases operations when the con figured temperature is reached the indoor fan mot...

Page 12: ... rises above TCDE1 C T3 maintained above TCDE2 C for 80 seconds Unit runs for 15 minutes consecutively in defrosting mode 5 6 5 Evaporator Temperature Protection When the evaporator temperature exceeds a preset protection value the compressor ceases operation 5 7 Auto mode This mode can be selected with the remote controller In auto mode the machine selects cooling heating or fan only mode on the ...

Page 13: ...Self Clean Optional If you press Self Clean when the unit is in cooling or drying mode For cooling only models the indoor unit will run in low fan mode for a certain time then ceases operation For these heat pump models the indoor unit will run in fan only mode then low heat and ﬁnally in fan only mode Self Clean keeps the indoor unit dry and prevents mold growth 5 15 Follow Me Optional If you pre...

Page 14: ...isplay ranges from 25 C to 70 C TP display ranges from 20 C to 130 C 4 The frequency display ran ges from 0 to 159HZ 5 If the actual values exceed or fall short of the defined range the values closest to the maximum and minimum values will be displayed Low speed Medium speed High speed Turbo Actual fan speed is equal to the display value converted to de cimal value and mul tiplied by 10 This is me...

Page 15: ... 13 Series 4 Models Wall Type Top Class R32 Refrigerant AC Displayed Code Explanation Meaning Additional Notes A0 Reserved 0 FF 2 28 5 20 5 25 A1 0 1 2 3 4 5 6 L A U T A 5 T Displayed Value ...

Page 16: ...charged before troubleshooting For other models connect discharge resistance approx 100Ω 40W or a soldering iron plug between the positi ve and negative terminals of the electrolytic capacitor The terminals are located on the bottom surface of the outdoor PCB Note This picture is for reference only Actual appearances may vary Discharging position discharging period is 10 sec or more Plug of solder...

Page 17: ...rt circuit 5 times ON F4 Outdoor unit EEPROM parameter error 6 times ON F5 The outdoor fan speed is operating outside of the normal range 1 time FLASH p0 IPM malfunction or IGBT over strong current protection 2 times FLASH p1 Over voltage or too low voltage protection 3 times FLASH p2 High temperature protection of IPM module 5 times FLASH p4 Inverter compressor drive error 6 2 General Troubleshoo...

Page 18: ...board cannot be set 4 Unit is on but the wind is not cold hot 5 Unit runs but it shortly stops 6 The unit starts up and stops frequently 7 Unit runs continuously but with insufficient cooling heating effect 8 Cooling mode cannot be changed to heating mode 9 Unit is noisy 6 3 Error Diagnosis and Troubleshooting Without Error Code 6 3 1 Remote maintenance SUGGESTION When troubles occur please check ...

Page 19: ...uently Unit will not start ƿ ƿ ƿ ƿ The power switch is on but fans will not start ƿ ƿ ƿ The temperature on the display board cannot be set ƿ ƿ Unit is on but the wind is not cold hot ƿ ƿ ƿ Unit runs but shortly stops ƿ ƿ ƿ The unit starts up and stops frequently ƿ ƿ ƿ Unit runs con nuously but insufficient cooling hea ng ƿ ƿ ƿ ƿ ƿ Cool can not change to heat Unit is noisy Test method remedy Test v...

Page 20: ...tart The power switch is on but fans will not start ƿ 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 ƿ Unit runs con nuously but insufficient cooling hea ng ƿ ƿ ƿ Cool can not change to heat Unit is noisy ƿ ƿ Test method remedy Check heat load Tighten bolts or screws Close all the window...

Page 21: ...ondenser outdoor fan will not start Evaporator indoor fan will not start Condenser Outdoor fan will not start Unit runs but it shortly stops Compressor short cycles due to overload High discharge pressure Low discharge pressure High suction pressure Low suction pressure Unit runs continuously but with insufficient cooling effect Too much cooling effect Compressor is noisy Horizontal louver cannot ...

Page 22: ... fan will not start ƿ ƿ ƿ ƿ Condenser Outdoor fan will not start ƿ ƿ ƿ ƿ ƿ Unit runs but shortly stops ƿ ƿ Compressor short cycles due to overload ƿ ƿ High discharge pressure Low discharge pressure High suc on pressure Low suc on pressure Unit runs con nuously but insufficient cooling Too cool ƿ ƿ Compressor is noisy Horizontal louver can not revolve ƿ ƿ ƿ Test method remedy Test voltage Inspect f...

Page 23: ...oosen hold down bolts and or screws Shipping plates remain a ached Poor choices of capacity Contact of piping with other piping or external plate ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ ƿ Replace the compressor Leak test Replace restricted part Clean or replace Clean coil Check fan Change charged refrigerant volume Clean condenser or remove obstacl...

Page 24: ...art requiring replacement Error Code F1 F2 F3 F4 F5 P0 P1 P2 P4 Indoor PCB x x x x x x x x x Outdoor PCB Reactor x x x x x x x x Indoor fan motor x x x x x x x x x Outdoor fan motor x x x x x x x x Temperature sensor x x x X x x T2 Sensor x x x x x x x x x Additional refrigerant x x x x x x x x x Compressor x x x x x x x IPM board x x x x x x Outdoor unit x x x x x x x x x 6 4 Quick Maintenance by...

Page 25: ... Disconnect the temperature sensor from PCB measure the resistance value with a tester Temperature Sensors Room temp T1 sensor Indoor coil temp T2 sensor Outdoor coil temp T3 sensor Outdoor ambient temp T4 sensor Compressor discharge temp TP sensor Measure the resistance value of each temperature sensor by using the multi meter 6 5 1 2 Compressor checking Measure the resistance value of each windi...

Page 26: ...esistance value Digital tester Red Red Black Black P N U N U V V W W 6 5 1 3 IPM Continuity Check Turn off the power let the large capacity electrolytic capacitors discharge completely and dismount the IPM Use a digital tester to measure the resistance between P and U V W N U V W and N Several MΩ Several MΩ ...

Page 27: ...Outdoor PCB Remarks The location of the EEPROM chip on the indoor and outdoor PCB is shown in the following two images Note These images are for reference only Shut off the power supply and turn it on 2 minutes later Is it still displaying the error code The unit is operating normally Correct the connection Replace the indoor outdoor main PCB If the EEPROM chip is welded on main PCB replace the ma...

Page 28: ... wiring connection YES YES NO NO Is it normal YES Is the error resolved NO NO NO Power off then restart the unit after 2 minutes Measure Vs Vs is the voltage between S and N of outdoor unit Red pan S Black pan N Is the voltage moving alternately between Positive and Negative The voltage moves alternately with positive value The voltage is a certain value Check the indoor wiring connections Replace...

Page 29: ...port When AC is normal running the voltage will move alternately between 25V to 25V If the outdoor unit has malfunction the voltage will move alternately with positive value While if the indoor unit has malfunction the voltage will be a certain value Use a multimeter to test the resistance of the reactor which does not connect with capacitor The normal value should be around 0 Ohm Otherwise the re...

Page 30: ...ow 150RPM or over 1500RPM for an extended period of time the unit will stop and the LED will display the failure F5 Recommended parts to check or to prepare Wiring mistake Faulty fan assembly Faulty fan motor Faulty PCB Power off then restart the unit after 2 minutes The unit is operating normally Shut off the power supply Rotate the fan by hand Does it turn easily Find the cause of the problem an...

Page 31: ...f pin1 pin3 pin4 pin3 in fan motor connec tor If the value of the voltage is not in the range shown in below table the PCB must have problems and needs to be replaced DC motor voltage input and output voltage 220 240V AC 2 Outdoor DC Fan Motor control chip is in outdoor PCB Release the U V W connector Measure the resistance of U V U W V W If the resistance values are not equal to each other the fa...

Page 32: ...the sampling voltage is lower than 0 06V or higher than 4 94V the LED will display the failure Recommended parts to check or to prepare Wiring mistake Faulty sensor Faulty PCB Check the connection between temperature sensor and PCB Is it properly wired Ensure proper connections Measure the resistance value of the sensor Replace the sensor Is the value within acceptable parameters Replace indoor or...

Page 33: ...us 3 minutes and this situation happens 3 times the display area will show EC and AC will turn off Recommended parts to prepare or to check Faulty T2 sensor Faulty indoor PCB System problems such as leakage or blockages Troubleshooting and repair Power off then restart the unit 2 minutes later Put your hands in front of the indoor air outlet Is there some cool air blowing out from indoor air outle...

Page 34: ...o prepare Power supply problems System blockage Faulty PCB Wiring mistake Compressor malfunction Check the power supply Is it in working order Stop the unit Check system for blockages Do any exist Clear the blockage Check the compressor resistance values Replace the compressor Are they within acceptable parameters Check the connections and wires Are they properly connected Ensure proper connection...

Page 35: ...ff Recommended parts to check or to prepare Wiring mistake IPM malfunction Faulty outdoor fan assembly Compressor malfunction Faulty outdoor PCB Check the wiring between PCB and compressor Does an error exist Ensure proper connections or replace the wires and connectors Check the IPM Replace the IPM board or replace the outdoor PCB Check the outdoor fan and the outdoor unit ventilation Is it in wo...

Page 36: ...epare Power supply issues System leakage or blockage Faulty PCB Check the power supply Is it in working order Turn off the unit Check the connections and wires Are they in working order Ensure proper connections or replace the wires Power on and measure the voltage between P and N Replace the IPM board While the unit is in standby is the voltage between P and N around DC 310V 340V or 380V When sta...

Page 37: ...osis and solution Description If the temperature of IPM module is higher than setting value the LED displays this failure code Recommended parts to prepare or to check Faulty PCB Connection problems Check the fastening screws on the PCB and IPM radiator Replace the outdoor control PCB Are they fixed tightly Tighten the screws and apply silicon grease ...

Page 38: ...ring mistake IPM malfunction Faulty outdoor fan assembly Compressor malfunction Faulty outdoor PCB Troubleshooting and repair Check the wiring between the PCB and compressor Is it improperly wired Check the IPM Replace the IPM board or replace the outdoor PCB Is IPM functioning properly Check the outdoor fan and the outdoor unit ventilation Is everything in good working order Please refer to Fan S...

Page 39: ...8 37 99 5 87359 77 171 1 29078 117 243 0 38991 2 28 39 8239 38 100 5 62961 78 172 1 25423 118 244 0 37956 1 30 37 1988 39 102 5 39689 79 174 1 2133 119 246 0 36954 0 32 35 2024 40 104 5 17519 80 176 1 17393 120 248 0 35982 1 34 33 3269 41 106 4 96392 81 178 1 13604 121 250 0 35042 2 36 31 5635 42 108 4 76253 82 180 1 09958 122 252 0 3413 3 37 29 9058 43 109 4 5705 83 181 1 06448 123 253 0 33246 4 ...

Page 40: ...25 222 8 36 97 34 32 76 169 7 82 116 241 2 357 3 27 211 4 37 99 32 94 77 171 7 566 117 243 2 294 2 28 200 7 38 100 31 62 78 172 7 321 118 244 2 233 1 30 190 5 39 102 30 36 79 174 7 086 119 246 2 174 0 32 180 9 40 104 29 15 80 176 6 859 120 248 2 117 1 34 171 9 41 106 28 81 178 6 641 121 250 2 061 2 36 163 3 42 108 26 9 82 180 6 43 122 252 2 007 3 37 155 2 43 109 25 86 83 181 6 228 123 253 1 955 4 ...

Page 41: ...45 7 22 75 23 89 85 29 44 95 35 105 40 56 115 46 11 120 48 89 PSI 70 59 95 96 108 118 121 115 119 128 150 157 PSI 75 63 99 101 117 128 126 122 129 135 158 165 PSI 80 67 105 106 125 141 138 132 135 143 165 176 PSI 90 73 114 115 142 155 152 141 148 157 184 193 F C ODT IDT 0 17 5 15 15 9 44 45 7 22 75 23 89 85 29 44 95 35 105 40 56 115 46 11 120 48 89 MPA 70 59 0 65 0 66 0 74 0 82 0 84 0 80 0 83 0 88...

Page 42: ... 21 9 20 4 F C ODT IDT 57 53 13 89 11 67 47 43 8 33 6 11 37 33 2 78 0 56 27 23 2 78 5 17 13 8 33 10 56 0 2 17 19 17 18 27 28 PSI 55 448 421 374 337 308 273 244 PSI 65 480 444 394 375 346 303 282 PSI 75 499 466 411 389 369 318 296 F C ODT IDT 57 53 13 89 11 67 47 43 8 33 6 11 37 33 2 78 0 56 27 23 2 78 5 17 13 8 33 10 56 0 2 17 19 17 18 27 28 MPA 55 3 09 2 91 2 58 2 33 2 12 1 89 1 68 MPA 65 3 32 3 ...

Page 43: ...Series 4 Models Wall Type Top Class R32 Refrigerant AC Notes 1 Notes ...

Page 44: ...Series 4 Models Wall Type Top Class R32 Refrigerant AC Notes 2 Notes ...

Page 45: ...s 4 Models Wall Top Class R32 Refrigerant AC Due to on going technological development of the products by the manufacturer we reserve the right to vary the technical specifications at any time without notice ...

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