Table of Contents
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Table of Contents
Troubleshooting
Related Manuals for Midea MSMBAU-09HRFN1-QRD0GW
Summary of Contents for Midea MSMBAU-09HRFN1-QRD0GW
- Page 1 Mission 3D Inverter Series Service Manual 2014 MBSEU-A-1412...
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Page 2: Table Of Contents
CONTENTS 1. Precaution ..............................3 1.1 Safety Precaution .......................... 3 1.2 Warning ............................3 2. Function ................................ 6 3. Dimension ..............................7 3.1 Indoor Unit ............................. 7 3.2 Outdoor Unit ..........................10 4. Refrigerant Cycle Diagram ........................13 5 Installation Details ............................14 5.1 Wrench torque sheet for installation ................... -
Page 3: Precaution
Sharp edges could cause injury, be especially careful of the case edges and the fins on the 1. Precaution condenser and evaporator. For installation, always contact the 1.1 Safety Precaution dealer or an authorized service center. Do not install the product on a ... - Page 4 There is risk of electric shock or fire. product. Stop operation and close the window It can avoid vibration of water leakage. in storm or hurricane. If possible, remove Do not install the product where the the product from the window before the noise or hot air from the outdoor unit could hurricane arrives.
- Page 5 Use a firm stool or ladder when cleaning or maintaining the product. Be careful and avoid personal injury. Replace the 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.
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Page 6: Function
2. Function Model Names of Indoor/Outdoor Units Capacity Indoor units Outdoor units MSMBAU-09HRFN1-QRD0GW MOB01-09HFN1-QRD0GW 3D inverter MSMBBU-12HRFN1-QRD0GW MOB01-12HFN1-QRD0GW MSMBCU-18HRFN1-QRD0GW MOB01-18HFN1-QRD0GW MSMBDU-24HRFN1-QRD0GW MOF2-24HFN1-QRD0GW... -
Page 7: Dimension
3. Dimension 3.1 Indoor Unit Model MSMBAU-09HRFN1-QRD0GW MSMBBU-12HRFN1-QRD0GW MSMBCU-18HRFN1-QRD0GW MSMBDU-24HRFN1-QRD0GW 1090... - Page 8 For MSMBAU-09HRFN1-QRD0GW: For MSMBBU-12HRFN1-QRD0GW: For MSMBCU-18HRFN1-QRD0GW: For MSMBDU-24HRFN1-QRD0GW:...
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Page 10: Outdoor Unit
3.2 Outdoor Unit More than 30cm More than 60cm (Service space) More than 30cm More than 60cm More than 200cm... - Page 11 For MOB01-09HFN1-QRD0GW, MOB01-12HFN1-QRD0GW, MOB01-18HFN1-QRD0GW,...
- Page 12 For MOF2-24HFN1-QRD0GW, Model MOF2-24HFN1-QRD0GW...
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Page 13: Refrigerant Cycle Diagram
4. Refrigerant Cycle Diagram INDOOR OUTDOOR CHECK VALVE LIQUID SIDE (Heating Model only) 2-WAY VALVE CAPILIARY TUBE HEAT HEAT EXCHANGE EXCHANGE (EVAPORATOR) (CONDENSER) T1 Room temp. sensor T2 Evaporator temp. sensor GAS SIDE 4-WAY VALVE 3-WAY VALVE ACCUMULATOR COOLING COMPRESSOR HEATING... -
Page 14: Installation Details
5 Installation Details 5.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque inch N.cm N.cm Ф6.35 1500(153kgf.cm) 1600(163kgf.cm) Ф9.52 2500(255kgf.cm) 2600(265kgf.cm) Ф12.7 3500(357kgf.cm) 3600(367kgf.cm) Ф15.9 4500(459kgf.cm) 4700(479kgf.cm) Ф19 6500(663kgf.cm) 6700(683kgf.cm) 5.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. Rated current of appliance Nominal cross-sectional area (mm²... -
Page 15: Pipe Length And The Elevation
The pipe length and refrigerant amount: Standard Max. Max. Additional Pipe size Model length Elevation Length refrigerant Liquid B (m) A (m) (g/m) 3/8’’ 1/4’’ MSMBAU-09HRFN1-QRD0GW + (Ф6.35) MOB01-09HFN1-QRD0GW (Ф9.52) 3/8’’ 1/4’’ MSMBBU-12HRFN1-QRD0GW + (Ф6.35) MOB01-12HFN1-QRD0GW (Ф9.52) 1/4’’ MSMBCU-18HRFN1-QRD0GW + 1/2’’ (Ф12.7) (Ф6.35) MOB01-18HFN1-QRD0GW 3/8’’... -
Page 16: Installation For The First Time
4) Fully open the handle Lo of the manifold 5.4 Installation for the first time valve. 5) Operate the vacuum pump to evacuate. Air and moisture in the refrigerant system have 6) Make evacuation for 30 minutes and check undesirable effects as below: whether the compound meter indicates ●... -
Page 17: Adding The Refrigerant After Running The System For Many Years
charge set. Purge the air by loosening the flare and press the check valve on the charge set to nut on the 2-way valve approximately 45’ for 3 purge the air (be careful of the liquid seconds then closing it for 1 minute; repeat 3 refrigerant). -
Page 18: Re-Installation While The Indoor Unit Need To Be Repaired
4) Operate the air conditioner at the cooling and stop it when the gauge indicates 0.1MPa. mode. 6). Set the 3-way valve to the closed position 5) Open the valves (Low side) on the charge set immediately and charge the system with liquid refrigerant. Do this quickly so that the gauge ends up 6).When the electronic scale displays the proper indicating 0.3 to 0.5Mpa. -
Page 19: Re-Installation While The Outdoor Unit Need To Be Repaired
Be sure to use a hexagonal wrench to operate the valve stems. 7). Mount the valve stems nuts and the service port cap Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m. Be sure to check the gas leakage. - Page 20 Be sure to check for gas leakage...
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Page 21: Operation Characteristics
6. Operation Characteristics Mode Cooling operation Heating operation Drying operation Temperature Room temperature 17℃~32℃ 0℃~30℃ 10℃~32℃ (62℉~90℉) (32℉~86℉) (50℉~90℉) Outdoor temperature 0℃~50℃ -20℃~30℃ 0℃~50℃ (-4 ℉~86℉) (32℉~122℉) (32℉~122℉) -15℃~50℃ (5℉~122℉) (For the models with low temperature cooling system) CAUTION: 1. If the air conditioner is used beyond the above conditions, certain safety protection features may come into operation and cause the unit to operate abnormally. -
Page 22: Electronic Function
Swing, Turbo or Silence feature is cancelled. 7. Electronic function Dispalys ‘ ’ under deforsting operation. 7.1 Abbreviation Dispalys ‘ ’ when anti-cold air feature is T1: Indoor room temperature activated under heating mode. T2: Coil temperature of evaporator Dispalys ‘ ’... -
Page 23: Main Protection
This function is only active in cooling mode. It 7.3 Main Protection can better prevent the compressor being damaged by refrigerant leakage or compressor 7.3.1 Three minutes delay at restart for overload. compressor Open condition: Less than 1 minute delay for the 1 time When compressor is active, the value of the stand-up and 3 minutes delay for others. -
Page 24: Operation Modes And Functions
7.4 Operation Modes and Functions 7.4.1 Fan mode ( 1) Outdoor fan and compressor stop. (2) Temperature setting function is disabled, and no setting temperature is displayed. (3) Indoor fan can be set to high/med/low/auto. (4) The louver operates same as in cooling mode. - Page 25 Decrease Hold Resume When condenser temperature temp. is more than setting value, the compressor will stop. 7.4.2.5 Evaporator temperature protection When Evaporator temperature temp.is less than setting value, the compressor will stop. 7.4.3.3 Indoor fan running rules 7.4.3 Heating Mode When the compressor is on, the indoor fan can be set to high/med/low/auto/mute.
- Page 26 T1-Td+ΔT T1-Ts Cooling Fan only Heating* 7.4.3.4Defrosting mode AC will enter the defrosting mode according to the value of temp. of T3 and the value range of Indoor fan will run at auto fan of the relevant temp. change of T3 and also the compressor mode.
- Page 27 7.4.7 Auto-Restart function The indoor unit is equipped with auto-restart function, which is carried out through an auto-restart module. In case of a sudden power failure, the module memorizes the setting conditions before the power failure. The unit will resume the previous operation setting (not including swing function) automatically after 3 minutes when power returns.
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Page 28: Troubleshooting
8. Troubleshooting Safety Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity power in capacitor. Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) For other models, please connect discharge resistance (approx.100Ω 40W) or soldering iron (plug) between +, - terminals of the electrolytic capacitor on the contrary side of the outdoor PCB. -
Page 29: Indoor Unit Error Display
8.1 Indoor Unit Error Display Operation Timer lamp Display LED STATUS lamp ☆ 1 time Indoor unit EEPROM parameter error ☆ 2 times Indoor / outdoor units communication error ☆ 4 times Indoor fan speed has been out of control Indoor room temperature sensor T1 open circuit or short ☆... -
Page 30: Trouble Shooting
8.2 Trouble shooting 8.2.1 EEPROM parameter error diagnosis and solution(E0/F4) E0/F4 Error Code Malfunction decision Indoor or outdoor PCB main chip does not receive feedback conditions from EEPROM chip. Supposed causes Installation mistake ● PCB faulty ● Trouble shooting: Power off, then restart the unit 2 minutes later. - Page 31 8.2.2 Indoor / outdoor unit’s communication diagnosis and solution(E1) Error Code Malfunction decision Indoor unit does not receive the feedback from outdoor unit during conditions seconds and this condition happens four times continuously. Supposed causes Wiring mistake ● Indoor or outdoor PCB faulty ●...
- Page 32 8.2.4 Fan speed has been out of control diagnosis and solution(E3) E3/F5 Error Code Malfunction decision When indoor fan speed keeps too low (300RPM) for certain time, conditions the unit will stop and the LED will display the failure. Supposed causes Wiring mistake ●...
- Page 33 Index1: 1:Indoor or 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 34 8.2.4 Refrigerant Leakage Detection diagnosis and solution(EC) Error Code Malfunction decision Define the evaporator coil temp.T2 of the compressor just starts conditions running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2 ＜Tcool－2℃ does not keep continuous 4 seconds and this situation happens 3 times, the display area will show “EC”...
- Page 35 8.2.5 Open circuit or short circuit of temperature sensor diagnosis and solution(E5) E4/E5/F1/F2/F3 Error Code Malfunction decision If the sampling voltage is lower than 0.06V or higher than 4.94V, conditions the LED will display the failure. Supposed causes Wiring mistake ●...
- Page 36 8.2.6 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0) Error Code Malfunction decision When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show “P0” and AC will turn off. conditions Supposed causes Wiring mistake ●...
- Page 37 8.2.7 Over voltage or too low voltage protection diagnosis and solution(P1) Error Code Malfunction decision An abnormal voltage rise or drop is detected by checking the conditions specified voltage detection circuit. Supposed causes Power supply problems. ● System leakage or block ●...
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Page 38: Trouble Shooting
8.2.8 High temperature protection of compressor top diagnosis and solution(P2) Error Code Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Supposed causes Power supply problems. ● System leakage or block ● PCB faulty ●... - Page 39 8.2.9 Inverter compressor drive error diagnosis and solution(P4) Error Code Malfunction decision An abnormal inverter compressor drive is detected by a special conditions detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Supposed causes Wiring mistake ●...
- Page 40 Main parts check 1. Temperature sensor checking 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.(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
- Page 41 Appendix 1 Temperature Sensor Resistance Value Table (℃--K) ℃ ℃ ℃ ℃ K Ohm K Ohm K Ohm K Ohm 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5000 2.19073 0.59386 96.3423 10.9731 2.11241 0.57683 89.5865 10.4736 2.03732 0.56038 84.2190 10.000 1.96532...
- Page 42 2.Compressor checking Measure the resistance value of each winding by using the tester. Position Resistance Value ASN98D22UFZ ASM135D23UFZ DA200S2C-10MT Blue - Red 1.57Ω 0.51Ω 1.75Ω Blue - Black (20℃/68℉) (20℃/68℉) (20℃/68℉) Red - Blue...
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Questions and answers
Good day. my unit is dripping water from the front on both ends of the flaps
A Midea MSMBAU-09HRFN1-QRD0GW unit dripping water from the front on both ends of the flaps could be caused by the following issues:
1. Clogged or Dirty Filter – A dirty filter reduces airflow, causing condensation to form and drip improperly. Clean the filter every two weeks or more if necessary.
2. Improper Drain Hose Installation – If the drain hose is not installed correctly, water may not drain properly and could leak from the front. Ensure the drain hose is positioned to allow proper water drainage.
3. Level Installation – If the unit is not level, water may pool inside and leak from the front instead of draining properly. Ensure the unit is installed evenly.
4. Blocked or Clogged Drainage System – A blocked drain path can cause water to back up and leak from unintended areas. Check and clear any obstructions in the drainage system.
5. Low Refrigerant Levels – Low refrigerant may cause abnormal condensation and water leakage. Check for refrigerant leaks and ensure proper levels.
If the issue persists, inspect these areas and take corrective actions accordingly.
This answer is automatically generated