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Midea MCHS-09PSH1, Service Manual

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Midea MCHS-09PSH1 Service Manual Download Page 41

 

9.3.6 Refrigerant Leakage Detection diagnosis and solution(EC)

 

Error Code 

EC 

 

Malfunction decision 

conditions 

Define the evaporator coil temp.T2 of the compressor just starts 

running as Tcool.   

In the beginning 5 minutes after the compressor starts up, if T2 

＜

Tcool

－

2

°C(Tcool

－

35.6

°F) does not    keep continuous 4 

seconds and this situation happens 3 times, the display area will 

show “EC” and AC will turn off.   

Supposed causes 

● 

T2 sensor faulty 

● 

Indoor PCB faulty 

● 

System problems, such as leakage or blocking. 

Trouble shooting: 

 

Summary of Contents for MCHS-09PSH1

Page 1: ...Mission 3D Inverter Series Service Manual 2016 MBSUL A 1604...

Page 2: ...or the first time 16 6 5 Adding the refrigerant after running the system for many years 16 6 6 Re installation while the indoor unit need to be repaired 17 6 7 Re installation while the outdoor unit n...

Page 3: ...ges and the fins on the condenser and evaporator For installation always contact the dealer or an authorized service center Do not install the product on a defective installation stand Be sure the ins...

Page 4: ...ause water leakage Keep level even when installing the product It can avoid vibration of water leakage Do not install the product where the noise or hot air from the outdoor unit could damage the neig...

Page 5: ...Do not mix old and new batteries or different types of batteries There is risk of fire or explosion Do not recharge or disassemble the batteries Do not dispose of batteries in a fire They may burn of...

Page 6: ...y Indoor units Outdoor units 9k 115V MEHS 09PSH1 MCHS 09PSH1 9k MEHSU 09PHH2 MCHSU 09PHH2 12k 115V MEHS 12PSH1 MCHS 12PSH1 12k MEHSU 12PHH2 MCHSU 12PHH2 18k MEHSU 18PHH2 MCHSU 18PHH2 24k MEHSU 24PHH2...

Page 7: ...el W D H 9k 115V 230V 31 89 810 7 87 200 11 81 300 12k 115V 230V 31 89 810 7 87 200 11 81 300 18k 42 91 1090 9 25 235 13 31 338 24k 42 91 1090 9 25 235 13 31 338 30k 54 15 1350 10 71 272 14 37 365 36k...

Page 8: ...For 9k 12k For 18k 24k For 30k 36k...

Page 9: ...in mm D in mm H in mm W1 in mm A in mm B in mm 9k 115V 30 31 770 11 81 300 21 85 555 33 07 840 19 2 487 11 73 298 12k 115V 31 50 800 13 11 333 21 81 554 34 25 870 20 24 514 13 39 340 9k 230V 31 50 80...

Page 10: ...GAS SIDE HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER COMPRESSOR 2 WAY VALVE 3 WAY VALVE 4 WAY VALVE COOLING HEATING T2 Evaporator temp sensor T1 Room temp sensor ACCUMULATOR INDOOR OUTDOOR CHECK...

Page 11: ...5 Wiring Diagram 5 1 Indoor Unit MEHS 09PSH1 MEHS 12PSH1 MEHSU 09PHH2 MEHSU 12PHH2...

Page 12: ...MEHSU 18PHH2 MEHSU 24PHH2 MEHS 30PSH2 MEHS 36PSH2...

Page 13: ...5 2 Outdoor Unit MCHS 09PSH1 MCHS 12PSH1 MCHSU 09PHH2 MCHSU 12PHH2 MCHSU 18PHH2...

Page 14: ...MCHSU 24PHH2 MCHS 30PSH2 MCHS 36PSH2...

Page 15: ...pliance Amps AWG Wire Size 10 18 13 16 18 14 25 12 30 10 The cable size and the current of the fuse or switch are determined by the maximum current indicated on the nameplate which located on the side...

Page 16: ...the vacuum pump 4 Fully open the handle Lo of the manifold valve 5 Operate the vacuum pump to evacuate 6 Make evacuation for 30 minutes and check whether the compound meter indicates 0 1Mpa 14 5Psi I...

Page 17: ...rench to operate the valve stems 2 Connect the charge hose with the push pin of handle lo to the 3 way valves gas service port 3 Air purging of the charge hose Open the handle Lo valve of the manifold...

Page 18: ...um pump 5 Disconnect the charge hose from the vacuum pump 2 Refrigerant charging Procedure 1 Connect the charge hose to the charging cylinder open the 2 way valve and the 3 way valve Connect the charg...

Page 19: ...115V 9k 230V 12k 230V 18k 24k 30k 36k Operating Range Cooling Outdoor Min Max DB F C 4 122 20 50 4 122 20 50 4 122 20 50 4 122 20 50 4 122 20 50 4 122 20 50 4 122 20 50 4 122 20 50 Indoor Min Max DB F...

Page 20: ...Turbo or Silence feature is activated Dispalys for three seconds when Timer OFF is set Dispalys for three seconds when Fresh Swing Turbo or Silence feature is cancelled Dispalys under deforsting opera...

Page 21: ...working 8 3 6 Indoor fan delayed open function When the unit starts up the louver will be active immediately and the indoor fan will open 7s later If the unit runs in heating mode the indoor fan will...

Page 22: ...ction function will be activated and the compressor will stop 8 4 2 2 Outdoor fan running rules The outdoor unit will be run at different fan speed according to T4 For different outdoor units the fan...

Page 23: ...4 3 3 Indoor fan running rules When the compressor is on the indoor fan can be set to high med low auto mute When indoor unit coil temp is low the anti cold air function will start and indoor fan mot...

Page 24: ...ode 8 4 6 Forced operation function Forced cooling mode The compressor and outdoor fan keep running and the indoor fan runs at low speed After running for 30 minutes AC will turn to auto mode with 24...

Page 25: ...8 4 8 8 Heating optional When the compressor is running the indoor fan motor will run without anti cold air function When the compressor is off the indoor fan motor is off...

Page 26: ...y information Displaying code Meaning T1 T1 T1 temp T2 T2 T2 temp T3 T3 T3 temp T4 T4 T4 temp T2B Tb T2B temp TP TP TP temp TH TH TH temp Targeted Frequency FT Targeted Frequency Actual Frequency Fr A...

Page 27: ...139 E0 E1 E9 140 141 149 F0 F1 F9 150 151 159 Indoor fan speed Outdoor fan speed 0 OFF 1 2 3 4 Low speed Medium speed High speed Turbo For some big capacity motors 14 FF Actual fan speed Display value...

Page 28: ...lectricity power in capacitor Electrolytic Capacitors HIGH VOLTAGE CAUTION For other models please connect discharge resistance approx 100 40W or soldering iron plug between terminals of the electroly...

Page 29: ...been out of control 1 times P0 IPM malfunction or IGBT over strong current protection 2 times P1 Over voltage or over low voltage protection 3 times P2 High temperature protection of IPM module or co...

Page 30: ...1 C401 R 403 C411 C40 C50 D 403 R401 R405 R 406 R 404 E404 D402 D404 C4 08 C402 E403 R407 R4 08 C404 C1 10 E409 E4 01 R402 C405 10 9 7 6 5 4 3 1 T401 C406 C407 D13 D14 E406 E407 E408 E502 E503 E504 D...

Page 31: ...612 C606 C605 C6 01 C 509 C 508 C 507 C5 06 C5 05 C5 04 C5 03 C412 C4 10 C409 C408 C405 C404 C4 03 C402 C401 C322 C312 C 305 C3 03 C302 C274 C273 C272 C271 C 133 C132 C131 C130 C129 C128 C127 C126 C12...

Page 32: ...display Fuse T30A 250V connect to high and low pressure sensor connect to trmp sensor Fuse 5A 250V connect to earth CN23 reserve digital display button test report connect to detector CN43 5 CN43 1 CN...

Page 33: ...4 L IN2 N IN2 OUTFAN DC IC1 CN53 power supply connect to the terminal 208 230V AC CN54 CN51 CN52 PFC inductance terminal CN58 EATTH 210 300VDC Running CAPACITOR Voltage 290 330VDC standby CN55 TO MAIN...

Page 34: ...e feedback from EEPROM chip Supposed causes Installation mistake PCB faulty Trouble shooting EEPROM a read only memory whose contents can be erased and reprogrammed using a pulsed voltage For the loca...

Page 35: ...tion E1 Error Code E1 Malfunction decision conditions Indoor unit does not receive the feedback from outdoor unit during 110 seconds and this condition happens four times continuously Supposed causes...

Page 36: ...ultimeter to test the DC voltage between 2 port and 3 port of outdoor unit The red pin of multimeter connects with 2 port while the black pin is for 3 port When AC is normal running the voltage will m...

Page 37: ...nd solution E2 Error Code E2 Malfunction decision conditions When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal Supposed causes...

Page 38: ...E3 Error Code E3 F5 Malfunction decision conditions When indoor fan speed keeps too low 300RPM for certain time the unit will stop and the LED will display the failure Supposed causes Wiring mistake...

Page 39: ...GND 0V 4 White Vcc 14 17 5V 5 Yellow Vsp 0 5 6V 6 Blue FG 14 17 5V 2 Outdoor DC Fan Motor control chip is in outdoor PCB Power on and check if the fan can run normally if the fan can run normally the...

Page 40: ...r diagnosis and solution E5 Error Code E4 E5 F1 F2 F3 Malfunction decision conditions If the sampling voltage is lower than 0 06V or higher than 4 94V the LED will display the failure Supposed causes...

Page 41: ...essor just starts running as Tcool In the beginning 5 minutes after the compressor starts up if T2 Tcool 2 C Tcool 35 6 F does not keep continuous 4 seconds and this situation happens 3 times the disp...

Page 42: ...F0 Error Code F0 Malfunction decision conditions An abnormal current rise is detected by checking the specified current detection circuit Supposed causes Power supply problems System blockage PCB faul...

Page 43: ...Malfunction decision conditions When the voltage signal that IPM send to compressor drive chip is abnormal the display LED will show P0 and AC will turn off Supposed causes Wiring mistake IPM malfunc...

Page 44: ...For example P U P V Note The photos below are only for reference it s may be not same totally with the ones on your side...

Page 45: ...P W N U...

Page 46: ...N V N W...

Page 47: ...For 24K 36K At first test the resistance between every two ports of U V W of IPM and P N If any result of them is 0 or close to 0 the IPM is defective Otherwise please follow the procedure below...

Page 48: ...decision conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit Supposed causes Power supply problems System leakage or block PCB faulty Trouble sh...

Page 49: ...P2 Error Code P2 Malfunction decision conditions If the sampling voltage is not 5V the LED will display the failure Supposed causes Installation mistake Power supply problems System leakage or block...

Page 50: ...inverter compressor drive is detected by a special detection circuit including communication signal detection voltage detection compressor rotation speed signal detection and so on Supposed causes Wir...

Page 51: ...tic capacitors discharge completely and dismount the IPM Use a digital tester to measure the resistance between P and UVWN UVW and N Digital tester Normal resistance value Digital tester Normal resist...

Page 52: ...For 24K 36K At first test the resistance between every two ports of U V W of IPM and P N If any result of them is 0 or close to 0 the IPM is defective Otherwise please follow the procedure below...

Page 53: ...onnect the plug Measure the resistance of the low pressure protector If the protector is normal the value is o Yes Yes Connect it well Replace outdoor main board No Replace low pressure protector No W...

Page 54: ...rom 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 te...

Page 55: ...078 117 243 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...

Page 56: ...422 4 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...

Page 57: ...7 4 39 2 33 91 4 64 147 2 95 203 126 258 8 4 5 40 1 34 93 2 65 149 96 204 8 127 260 6 5 41 35 95 66 150 8 97 206 6 128 262 4 6 42 8 36 96 8 67 152 6 98 208 4 129 264 2 7 44 6 37 98 6 68 154 4 99 210 2...

Page 58: ...tage of P and N 208 240V 1 phase 3 phase 380 420V 3 phase In standby around 310VDC around 530VDC In operation With passive PFC module With partial active PFC module With fully active PFC module 200VDC...

Page 59: ...h winding by using the tester Position Resistance Value ASN98D22UFZ ASM98D32UFZ ATM115D43UFZ2 Blue Red 1 57 20 68 2 3 20 68 1 78 20 68 Blue Black Red Blue Position Resistance Value ATF235D22UMT ATF250...

Page 60: ...ytic capacitors discharge completely and dismount the IPM Use a digital tester to measure the resistance between P and UVWN UVW and N Digital tester Normal resistance value Digital tester Normal resis...

Page 61: ...7 9 1 10 7 BAR 80 67 9 3 8 9 9 1 9 6 11 2 F C ODT IDT 75 23 89 85 29 44 95 35 105 40 56 115 46 11 PSI 70 59 119 113 117 125 147 PSI 75 63 124 120 126 132 155 PSI 80 67 135 129 132 140 162 F C ODT IDT...

Page 62: ...31 5 27 8 26 3 24 9 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 PSI 55 439 413 367 330 302 PSI 65 471 435 386 368 339 PSI 75 489 457 403 381 362 F C OD...

Page 63: ...arts name Procedures Remarks 1 Front panel How to remove the front panel 1 Pull the below side of the panel toward you and remove the cover 2 Release the connector of the display ass y 3 Release the t...

Page 64: ...the room temp sensor T1 Remove the two screws for the ground connection 3 Remove the fixing screw 4 Pull out the coil temp sensor 5 From the side direction open the electronic control box cover fixing...

Page 65: ...ove the electrical parts from procedure 2 disassemble the pipe holder at the rear side of the unit 2 Remove the screws on the evaporator at the fixed plate 3 Remove the two screws on the evaporator at...

Page 66: ...motor 1 Remove the front panel electrical parts and evaporator following procedure 1 3 2 Remove the two screws and remove the fixing board of fan motor 3 Remove the fixing screw 4 Pull out the fan mo...

Page 67: ...remove the panel plate 1 Stop operation of the air conditioner and turn OFF the power breaker 2 Remove the big handle first then remove the top cover 3 screws 3 Remove the screws of front panel 7 scre...

Page 68: ...How to remove the fan ass y 1 After remove the Air outlet grille 2 Remove the nut fixing the fan and remove the fan 3 After remove the top cover Unfix the hooks and then open the electronic control bo...

Page 69: ...ct the connector for fan motor from the electronic control board 5 Remove the four fixing screws of the fan motor then remove the motor 5 compressor T3 T4 T5 sensor Motor Electronic expansion valve 4...

Page 70: ...finish work of item 1 and item 2 remove the connector for the compressor 2 Pull out the two blue wires connected with the four way valve 3 Pull out connectors of the condenser coil temp sensor T3 outd...

Page 71: ...4 Disconnect the electronic expansion valve wire from the control board 5 Remove the ground wires 6 Remove the wires 1 2 3 Then remove the electronic control box 5 6...

Page 72: ...ipe 5 Then the four way valve ass y can be removed The picture of four way valve may be different from the one on your side 5 Compressor How to remove the compressor 1 After perform work of item1 3 Re...

Page 73: ...the air conditioner and turn OFF the power breaker 2 Remove the big handle first and then remove the top panel 3 screws 3 Remove the screws of front panel 7 screws 4 Remove the screws of the right si...

Page 74: ...to remove the fan ass y 1 After remove the Air outlet grille remove the hex nut fixing the fan and then remove the fan 2 After remove the top cover Unfix the hooks and then open the electronic contro...

Page 75: ...the connector for fan motor from the electronic control board 4 Remove the four fixing screws of the fan motor Then remove the fan motor 3 4 compressor T3 T4 T5 sensor Motor Electronic expansion valve...

Page 76: ...item 2 remove the connectors for the compressor 2 Pull out the two blue wires connected with the four way valve 3 Pull out connectors of the condenser coil temp sensor T3 outdoor ambient temp sensor T...

Page 77: ...rcuit 3 Remove the screw of the coil and then remove the coil 4 Detach the welded parts of four way valve and pipe 5 Then the four way valve ass y can be removed The picture of four way valve may be d...

Page 78: ...compressor on bottom plate 4 Lift the compressor from the base pan assembly 3...

Page 79: ...plate 1 Stop operation of the air conditioner and turn OFF the power breaker 2 Remove the top panel 7 screws 3 Remove the screws of front panel 9 screws 4 Remove the screws of the right side panel 10...

Page 80: ...to remove the fan ass y 1 After remove the Air outlet grille remove the hex nut fixing the fan and then remove the fan 2 After remove the top cover Unfix the hooks and then open the electronic contro...

Page 81: ...e electronic control board 4 Remove the four fixing screws of the fan motor Then remove the fan motor 3 4 T3 T4 T5 sensor wire Motor wire Electronic expansion valve Compressor wire 4 way valve wire El...

Page 82: ...work of item 1 and item 2 remove the connectors for the compressor and reactor 2 Pull out the two blue wires connected with the four way valve 3 Pull out connectors of the condenser coil temp sensor T...

Page 83: ...4 disconnect the electronic expansion valve wire 5 remove the electric heaters 6 Remove the grounding screw 7 Remove the wires 1 2 3 or L1 L2 S Then remove the electronic control box 4 5 7...

Page 84: ...ipe 5 Then the four way valve ass y can be removed The picture of four way valve may be different from the one on your side 3 5 Compressor How to remove the compressor 1 After perform work of item1 3...

Page 85: ...of the air conditioner and turn OFF the power breaker 2 Remove the big handle first then remove the top panel 7screws 3 Remove the screws of the front panel 11 screws 4 Remove the screws of the right...

Page 86: ...remove the fan ass y 1 After remove the Air outlet grille remove the hex nut fixing the fan and then remove the fan 2 After remove the top cover Unfix the hooks and screws then open the electronic con...

Page 87: ...lectronic control board 4 Remove the four fixing screws of the fan motor Then remove the fan motor 3 Electric pipe heater and Crankcase electric Heater wire Motor wire Electronic expansion Valve wire...

Page 88: ...sor and the compressor crankcase heater and the chassis electric heater 2 Pull out the two blue wires connected with the four way valve 3 Pull out connectors of the condenser coil temp sensor T3 outdo...

Page 89: ...w to remove the four way valve 1 Perform work of item1 3 2 Recover refrigerant from the refrigerant circuit 3 Remove the screw of the coil and then remove the coil 4 Detach the welded parts of four wa...

Page 90: ...form work of item1 3 Recover refrigerant from the refrigerant circuit 2 Remove the discharge pipe and suction pipe with a burner 3 Remove the hex nuts and washers fixing the compressor on bottom plate...

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