Midea MSMTAU-09HRFN8-QRD6GW Service Manual Download Page 44 | Manualshive

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10.2.6 Communication error between the indoor PCB and display board (Eb)

Error Code

Eb

Malfunction decision

conditions

Indoor PCB does not receive feedback from Display board.

Supposed causes

●

Wiring mistake

●

PCB faulty

●

Display board malfunction

Trouble shooting:

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Summary of Contents for MSMTAU-09HRFN8-QRD6GW

Page 1: ...Ultimate Comfort 3D Inverter Series Service Manual 2017 R32...

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

Page 3: ...s could cause injury be especially careful of the case edges and the fins on the condenser and evaporator For installation always contact the dealer or an authorized service center Do not install the...

Page 4: ...vels may cause failure of product Install the drain hose to ensure that water is drained away properly A bad connection may cause water leakage Keep level even when installing the product It can avoid...

Page 5: ...he all batteries in the remote control with new ones of the same type Do not mix old and new batteries or different types of batteries There is risk of fire or explosion Do not recharge or disassemble...

Page 6: ...ner that it may lead to the risk of fire or explosion All possible ignition sources including cigarette smoking should be kept sufficiently far away from the site of installation repairing removing an...

Page 7: ...is mounted securely Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of preventing the ingress of flammable atmospheres Replacement parts shall be i...

Page 8: ...ing to atmosphere and finally pulling down to a vacuum This process shall be repeated until no refrigerant is within the system When the final OFN charge is used the system shall be vented down to atm...

Page 9: ...te refrigerant recovery cylinders are employed Ensure that the correct numbers of cylinders for holding the total system charge are available All cylinders to be used are designated for the recovered...

Page 10: ...8 3 Model List Model Names of Indoor Outdoor Units 3D inverter Capacity Indoor units Outdoor units 9k MSMTAU 09HRFN8 QRD6GW MOB01 09HFN8 QRD6GW 12k MSMTAU 12HRFN8 QRD6GW MOB01 12HFN8 QRD6GW...

Page 11: ...9 4 Dimension 4 1 Indoor Unit W H Model W D H MSMTAU 09HRFN8 QRD6GW 886 188 315 MSMTAU 12HRFN8 QRD6GW 886 188 315...

Page 12: ...10 For MSMTAU 09HRFN8 QRD6GW MSMTAU 12HRFN8 QRD6GW...

Page 13: ...11 4 2 Outdoor Unit More than 30cm More than 60cm More than 200cm More than 30cm More than 60cm Service space Fence or obstacles...

Page 14: ...12 For MOB01 09HFN8 QRD6GW MOB01 12HFN8 QRD6GW 800 W 514 W1 554 60 85 5 340 12 0 311 815 W3 365 333 D 70 W2 H H1 H2 D1 D2 D3 62 B1 106 B2 20 A1 R20 R6 61 6 A2...

Page 15: ...E 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 CHEC...

Page 16: ...4 6500 663kgf cm 6700 683kgf cm 6 2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet Rated current of appliance Nominal cross section...

Page 17: ...m Max Length A m Additional refrigerant g m Gas Liquid MSMTAU 09HRFN8 QRD6GW MOB01 09HFN8 QRD6GW 3 8 9 52 1 4 6 35 5 10 25 15 MSMTAU 12HRFN8 QRD6GW MOB01 12HFN8 QRD6GW 3 8 9 52 1 4 6 35 5 10 25 15 Ca...

Page 18: ...3 Connect the charge hose of handle hi connection to 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 w...

Page 19: ...2 way valve and the 3 way valve Connect the charge hose to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from...

Page 20: ...hi connection to 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...

Page 21: ...e air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Open the valves Low side on the charge set and charge the system with liquid re...

Page 22: ...itioner is used beyond the above conditions certain safety protection features may come into operation and cause the unit to operate abnormally 2 The room relative humidity should be less than 80 If t...

Page 23: ...21 8 Wiring Diagram 8 1 Indoor Unit MSMTAU 09HRFN8 QRD6GW MSMTAU 12HRFN8 QRD6GW...

Page 24: ...22 8 2 Outdoor Unit MOB01 09HFN8 QRD6GW MOB01 12HFN8 QRD6GW...

Page 25: ...three seconds when Timer ON Fresh Swing Turbo or Silence feature is activated Dispalys for three seconds when Timer OFF is set Fresh Swing Turbo or Silence feature is cancelled Dispalys under deforsti...

Page 26: ...nd the unit ceases operation 9 3 5 Indoor fan delayed operation When the unit starts the louver is automatically activated and the indoor fan will operate after a period of setting time or the louver...

Page 27: ...ons are satisfied the compressor ceases operation When calculated frequency fb is less than minimum limit frequency FminC When protective time is more than or equal to ten minutes When T1 is lower tha...

Page 28: ...Reach the configured temperature 1 1 If the following conditions are satisfied the compressor ceases operation While calculated frequency fb is less than minimum limit frequency FminC When protective...

Page 29: ...ll turn on and the symbol is displayed If any one of the following condition is satisfied defrosting ends and the machine switches to normal heating mode T3 rises above TCDE1 T3 maintained above TCDE2...

Page 30: ...reaching the setting off time 5 Timer off on The machine will turn off automatically when reaching the setting off time and then turn on automatically when reaching the setting on time 6 The timer fu...

Page 31: ...han 24 it will quit the ECO operation 3 Operation time in ECO mode is 8 hours After 8 hours the AC quits this mode 4 When there s any one temperature sensor in malfunction the AC will quit ECO mode 5...

Page 32: ...ard to reach your present temperature in the shortest amount of time possible 2 When you select Boost feature in COOL mode the unit will blow cool air with strongest wind setting to jump start the coo...

Page 33: ...he screen will display this code for two seconds then the information for 25 seconds Enquiry information Displaying code Meaning T1 T1 T1 temp T2 T2 T2 temp T3 T3 T3 temp T4 T4 T4 temp TP TP TP temp T...

Page 34: ...electricity 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 electro...

Page 35: ...or ambient temperature sensor T4 open circuit or short circuit F2 Condenser coil temperature sensor T3 open circuit or short circuit F3 Compressor discharge temperature sensor T5 open circuit or short...

Page 36: ...ve 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 loc...

Page 37: ...lution 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 cause...

Page 38: ...tage is moving alternately as positive values and negative values If the outdoor unit has malfunction the voltage has always been the positive value While if the indoor unit has malfunction the voltag...

Page 39: ...E3 F5 Error Code E3 F5 Malfunction decision conditions When indoor fan speed keeps too low 300RPM or too high 1500RPM for certain time the unit will stop and the LED will display the failure Supposed...

Page 40: ...NO Color Signal Voltage 1 Red Vs Vm 280V 380V 2 3 Black GND 0V 4 White Vcc 14 18 5V 5 Yellow Vsp 0 5 6V 6 Blue FG 14 18 5V 2 Outdoor DC Fan Motor control chip is in outdoor PCB Power on and check if t...

Page 41: ...t running in fan mode at high fan speed After running for 15 seconds measure the voltage of pin1 and pin2 If the value of the voltage is less than 100V 208 240V power supply or 50V 115V power supply t...

Page 42: ...us 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 Troubl...

Page 43: ...ons If the sampling voltage is lower than 0 06V or higher than 4 94V the LED will display the failure Supposed causes Wiring mistake Sensor faulty Trouble shooting Check the connection between tempera...

Page 44: ...between the indoor PCB and display board Eb Error Code Eb Malfunction decision conditions Indoor PCB does not receive feedback from Display board Supposed causes Wiring mistake PCB faulty Display boar...

Page 45: ...n 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 fa...

Page 46: ...d causes Wiring mistake IPM malfunction Outdoor fan ass y faulty Compressor malfunction Outdoor PCB faulty Trouble shooting IPM continuity check Turn off the power let the large capacity electrolytic...

Page 47: ...n 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...

Page 48: ...of IPM diagnosis and solution P2 Error Code P2 Malfunction decision conditions If the temperature of IPM module is higher than limited value the LED will display the failure Supposed causes IPM radiat...

Page 49: ...bnormal 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 ca...

Page 50: ...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 t...

Page 51: ...29078 117 243 0 38991 2 28 39 8239 38 100 5 62961 78 172 1 25423 118 244 0 37956 1 30 38 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...

Page 52: ...2 422 4 25 222 8 36 97 34 32 76 169 8 82 116 241 2 357 3 27 211 4 37 99 32 94 77 171 8 566 117 243 2 294 2 28 200 7 38 100 31 62 78 172 8 321 118 244 2 233 1 30 190 5 39 102 30 36 79 174 8 086 119 246...

Page 53: ...pressor checking Measure the resistance value of each winding by using the tester Position Resistance Value ASN98D22UFZ ASM135D23UFZ ATF235D22UMT Blue Red 1 57 20 68 1 75 20 68 0 75 20 68 Blue Black R...

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