Lennox MCB Series Service Manual
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Lennox MCB Series Service Manual

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MWCB / MWHB Wall Mount Single-Zone
1. Safety Considerations ................................. 3
2. General Troubleshooting ............................ 4
2.1.
Error Codes .......................................................4
2.2.
Complaint Form .................................................5
2.3.
2.3.1. Engineering Mode Codes......................6
4.1.
TS01-IDU ...........................................................8
4.2.
TS01-ODU .........................................................8
4.3.
TS02-S-INV .......................................................9
4.4.
TS04-S-IDU .....................................................10
4.5.
TS04-S-ODU ...................................................13
4.6.
TS05-IDU .........................................................14
4.7.
TS05-ODU .......................................................15
4.8.
TS06-INV .........................................................16
4.9.
TS07 ................................................................16
4.10.
TS08-S .............................................................17
4.11.
TS09-S .............................................................18
4.12.
TS10-S .............................................................19
4.13.
TS12-S .............................................................20
5. Check Procedures ..................................... 21
MINI-SPLIT SYSTEMS SERVICE MANUAL
Please refer to 100041 for indoor and outdoor unit information.
Indoor Unit

Table of Contents

MCB/MWCB and MHB/MWHB
Series Diagnostic Information
MCB / MHB Single-Zone
Outdoor Units
5.1.
Temperature Sensor Check .............................21
5.2.
Compressor Check ..........................................21
5.3.
IPM Continuity Check ......................................23
5.4.
Reversing Valve Check ....................................24
6.1.
Temperature Sensor Resistance Values ..........25
6.2.
Values ..............................................................26
7. Pressure on Service Port .......................... 27
7.1.
Cooling Chart (R-410A) ...................................27
7.2.
Heating Chart (R-410A) ...................................28
7.3.
R-410 System Pressure...................................29
8. Wiring Diagrams ........................................ 30
8.1.
MWCB Indoor Units .........................................30
8.2.
MCB Outdoor Units..........................................31
8.3.
MWHB Indoor Units .........................................32
8.4.
MHB Outdoor Unit ...........................................33
9.1.
9.1.1. Front Panel Removal ..........................35
9.1.2. Control Board Removal .......................37
9.1.3. Evaporator Coil Removal ....................37
9.1.4. Fan Removal .......................................38
9.1.5. Step Motor Removal ...........................38
1
100042 5/2022

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  • Page 1: Table Of Contents

    MINI-SPLIT SYSTEMS SERVICE MANUAL MCB/MWCB and MHB/MWHB Series Diagnostic Information 100042 5/2022 Please refer to 100041 for indoor and outdoor unit information. MWCB / MWHB Wall Mount Single-Zone Indoor Unit MCB / MHB Single-Zone Outdoor Units Table of Contents 1. Safety Considerations ......... 3 5.1.
  • Page 2 9.1.6. Drain Hose Removal ......39 9.2. Outdoor Unit Disassembly .......39 9.2.1. MCB012S4S-1L, MCB009S4S-1P and MCB012S4S-1P ......39 9.2.2. MCB018S4S-1P, MCB024S4S-1P, MHB009S4S-1L, MHB012S4S-1L MHB009S4S-1P, MHB012S4S-1P and MHB018S4S-1P ......40 9.2.3. MHB024S4S-1P ........41 9.3. Control Board Removal ........42 9.3.1. MCB024S4S-1P and MHB024S4S-1P ........42 9.3.2. MCB009S4S-1P, MCB012S4S-1P, MCB018S4S-1P, MHB009S4S-1P, MHB012S4S-1P, and MHB018S4S-1P ........43...

  • Page 3: Safety Considerations

    WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional HVAC installer (or equivalent) or service agency 1. Safety Considerations WARNING Electric Shock Hazard. Can cause injury or death. Unit must be rounded in accordance with national and local codes. Line voltage is present at all components when unit is not in operation.

  • Page 4: General Troubleshooting

    2. General Troubleshooting 2.1. Error Codes When the indoor unit encounters detects an error condition the running LED with flash in a corresponding series, the timer LED may turn on or begin flashing and display the error code. These error codes are described in the following tables: Table 1.

  • Page 5: Complaint Form

    2.2. Complaint Form Request Number: Telephone Number: Home Address: Email: Product Information Indoor Unit Model: Outdoor Unit Model: Outdoor Unit Serial # Indoor Unit Serial # � � � � Operation Mode: Cooling Heating Fan Only � � � � Temperature Setting: _ _ ºF Fan Speed:...

  • Page 6: Engineering Mode For System Query

    2.3. Engineering Mode for System Query ON/OFF BUTTON UP / DOWN BUTTON • To enter engineer mode, in power-on or standby mode and in non-locked state, using the wireless remote control, press the key combination ON/OFF button and FAN button for 7 seconds. •...

  • Page 7: Quick Maintenance By Error Code

    3. Quick Maintenance by Error Code The following is a part replacement matrix based on the active error code. Table 4. Component Replacement Based on Error Code (Part 1) Error Code Part Requiring Replacement EH 00 / EH 0A EL 01 EH 03 EH 60 EH 61...

  • Page 8: Troubleshooting By Error Code

    4. Troubleshooting by Error Code 4.1. TS01-IDU Description: Indoor PCB main chip is not receiving feedback from the EEPROM chip. Possible Affected Components: Outdoor PCB Shu o the power supply for two minutes. Troubleshooting and Repair: Remarks: A read-only memory that can be erased and reprogrammed using a pulsed voltage. NOTE: On various models the indoor PCB can not be removed separately.

  • Page 9: Ts02-S-Inv

    4.3. TS02-S-INV Description: Indoor unit cannot communicate with the outdoor unit. Possible Affected Components: Indoor PCB, Outdoor PCB, IPM PCB or short-circuited component. Troubleshooting and Repair: NOTE: On various models the outdoor PCB can not be removed separately. In this situation the entire outdoor electric control box should be replaced.

  • Page 10: Ts04-S-Idu

    Description: Indoor unit cannot communicate with the outdoor unit. • Use a multimeter to test the resistance of the reactor which does not connect with the capacitor. • The normal value should be zero ohm. Any other reading typically indicates the reactor has malfunction.
  • Page 11 Description: When the indoor fan speed is to low or to high undeterminate amount of time, the LED displays the failure code and the system turns off. Power up the system and when the unit is in standby mode, measure the voltage of pin 1 - pin 3 and pin 4 - pin 3 on the fan motor connection.
  • Page 12 Description: When the indoor fan speed is to low or to high undeterminate amount of time, the LED displays the failure code and the system turns off. a. Power off and disconnect fan motor power cord from the PCB. Measure the resistance value of each winding by using a multimeter.

  • Page 13: Ts04-S-Odu

    4.5. TS04-S-ODU Description: When the outdoor fan speed is to low or to high undeterminate amount of time, the LED displays the failure code and the system turns off. Possible Affected Components: Outdoor main PCB, fan motor, fan assembly or connection wires. Troubleshooting and Repair: NOTE: On various models the outdoor PCB can not be removed separately.

  • Page 14: Ts05-Idu

    Description: When the outdoor fan speed is to low or to high undeterminate amount of time, the LED displays the failure code and the system turns off. Power on the system and place the unit in standby mode. Measure the voltage between pin 1 and pin 3, pin 4 and pin 4 on the fan motor connector.

  • Page 15: Ts05-Odu

    4.7. TS05-ODU Description: Open circuit or short circuit of indoor temperature sensors (T3, T4 and TP). If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure code. Possible Affected Components: Indoor main PCB, sensors or connection wires. Replace the outdoor Troubleshooting and Repair: main PCB...

  • Page 16: Ts06-Inv

    4.8. TS06-INV Description: Refrigerant Leakage Detection. Evaluate abnormal operation of the refrigeration system according to the number of compressor stops and the changes in the operating parameters caused by excessive exhaust temperature. Possible Affected Components: Indoor main PCB or need to add refrigerant. Troubleshooting and Repair: 4.9.

  • Page 17: Ts08-S

    4.10. TS08-S Description: Current overload protection. An abnormal current rise is detected by checking the specified current detection circuit. Possible Affected Components: Reactor, outdoor fan, outdoor PCB or communication wiring. Troubleshooting and Repair: NOTE: On various models the outdoor PCB can not be removed separately. In this situation the entire outdoor electric control box should be replaced...

  • Page 18: Ts09-S

    4.11. TS09-S Description: IPM malfunction or IGBT high current protection. When the IPM voltage signal to the compressor drive chip is abnormal, the LED displays the failure code and the system will turn off. Possible Affected Components: Outdoor PCB, compressor, outdoor fan assembly, IPM module board or connection wires.

  • Page 19: Ts10-S

    4.12. TS10-S Description: High or low voltage protection. Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit. Possible Affected Components: Power supply wiring, IPM module board, Outdoor PCB or reactor. Troubleshooting and Repair: NOTE: On various models the outdoor PCB can not be removed separately.

  • Page 20: Ts12-S

    4.13. TS12-S Description: Inverter compressor drive error. An abnormal inverter compressor drive is detected by a special detection circuit that includes communication signal detection, voltage detection and compressor rotation speed signal detection. Possible Affected Components: Connection wires, IPM module board, outdoor fan assembly, compressor or outdoor PCB.

  • Page 21: Check Procedures

    5. Check Procedures 5.1. Temperature Sensor Check WARNING Verify that power supplies have been disconnected to avoid electrick shock. Operate the system after restoring power and the compressor and coil have had time to returned to normal operating temperature. a. Disconnect the temperature sensor from the PCB (see Appendix D - Indoor/Outdoor Unit Disassembly). b.

  • Page 23: Ipm Continuity Check

    5.3. IPM Continuity Check WARNING Verify that capacitors are fully discharged before troubleshooting. a. Turn off outdoor unit and disconnect power supply a. Discharge capacitors. a. Disassemble outdoor PCB or IPM board. a. Measure the resistance value between P and U, (U, W, N); U (U, W) and N.

  • Page 24: Reversing Valve Check

    5.4. Reversing Valve Check a. Power on the system and use a digital tester to measure the voltage when the system is operating in cooling mode and the reading should be 0VAC. When the system is operating in heating mode, the value should be 230VAC. If the voltage value is not in the specified ranges, the PCB will be the issue and will need to be replace.

  • Page 25: Temperature Sensor Resistance Values

    6. Temperature Sensor Resistance Values 6.1. Temperature Sensor Resistance Values Table 6. Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K) °F °C K Ohm °F °C K Ohm °F °C K Ohm °F °C K Ohm 115.266 12.6431 2.35774...

  • Page 26: Discharge Temperature Sensor Resistance Values

    6.2. Discharge Temperature Sensor Resistance Values Table 7. Temperature Sensor Resistance Value Table for TP (°C – K) °F °C K Ohm °F °C K Ohm °F °C K Ohm °F °C K Ohm 542.7 68.66 13.59 3.702 -2.2 511.9 69.8 65.62 141.8...

  • Page 27: Pressure On Service Port

    7. Pressure on Service Port 7.1. Cooling Chart (R-410A)

  • Page 28: Heating Chart (R-410A)

    7.2. Heating Chart (R-410A)

  • Page 29: R-410 System Pressure

    7.3. R-410 System Pressure...

  • Page 30: Wiring Diagrams

    8. Wiring Diagrams 8.1. MWCB Indoor Units Figure 1. MWCB 09K,12K and 18K Indoor Unit Wiring Diagram (115 and 208/230VAC) 16022000C27182 Figure 2. MWCB 24K - 208/230VAC Indoor Unit Wiring Diagram...

  • Page 31: Mcb Outdoor Units

    8.2. MCB Outdoor Units Figure 3. MCB 09, 12K and 18K - 208/230VAC Outdoor Unit Wiring Diagram Figure 4. MCB 12K - 115VAC Outdoor Unit Wiring Diagram...

  • Page 32: Mwhb Indoor Units

    Figure 5. MCB 24K 208/230VAC Outdoor Unit Wiring Diagram 8.3. MWHB Indoor Units Figure 6. MWHB 09K,12K, and 18K - 115V and 208/230VAC Indoor Unit Wiring Diagram...

  • Page 33: Mhb Outdoor Unit

    16022000C27182 Figure 7. MWHB 24K 208/230VAC Indoor Unit Wiring Diagram 8.4. MHB Outdoor Unit Figure 8. MHB 9K and 12K - 115VAC Outdoor Unit Wiring Diagram...
  • Page 34 Figure 9. MHB 09K, 12K and 18K - 208/230VAC) Outdoor Unit Wiring Diagram Figure 10. MHB 24K - 208/230VAC Outdoor Unit Wiring Diagram...

  • Page 35: Indoor And Outdoor Unit Disassembly

    9. Indoor and Outdoor Unit Disassembly 9.1. MWCB and MWHB Unit Disassembly 9.1.1. Front Panel Removal Front Panel Removal 1. Hold the front panel 2. Push up the bottom by the tabs located of an air filter (step on both sides and 1), and then pull it out lift the panel up.
  • Page 36 Front Panel Removal 8. Open the screw cap 9. Release the hooks and then remove with hands. the 3 screws. 11. Pull out the panel frame while pushing 10. Release the 5 hooks the hook through a in the back. clearance between the panel frame and the heat exchanger.

  • Page 37: Control Board Removal

    9.1.2. Control Board Removal 2. Cut the ribbon secur- ing the T2 coil sensor and then pull out. 1. Remove the one screw securing the 3. Remove the one electrical control screw securing the box sub-assembly. electronic control box and two grounding screws.

  • Page 38: Fan Removal

    Evaporator Coil Removal 5. Pull out the evapo- rator 9.1.4. Fan Removal NOTE: The front pan- el, control box and evaporator coil must be re- 2. Remove the bearing moved prior to sleeve. this procedure 1. Remove the two screws and fan motor fixing board.

  • Page 39: Drain Hose Removal

    9.1.6. Drain Hose Removal 1. Rotate the fixed wire 2. Pull up the drain hose clockwise indicated to remove it. in right image 9.2. Outdoor Unit Disassembly 9.2.1. MCB012S4S-1L, MCB009S4S-1P and MCB012S4S-1P 3. Remove the three 1. Disconnect power to screws securing the the system.

  • Page 40: Mcb018S4S-1P, Mcb024S4S-1P, Mhb009S4S-1L, Mhb012S4S-1L Mhb009S4S-1P, Mhb012S4S-1P And Mhb018S4S-1P

    9.2.2. MCB018S4S-1P, MCB024S4S-1P, MHB009S4S-1L, MHB012S4S-1L MHB009S4S-1P, MHB012S4S-1P and MHB018S4S-1P 3. Remove the four 1. Disconnect power to screws securing the the system. top cover and remove the top cover. 2. Remove the one screw securing NOTE: One of the the big handle and screws is located then remove the big underneath the...

  • Page 41: Mhb024S4S-1P

    9.2.3. MHB024S4S-1P 3. Remove the three 1. Disconnect power to screws securing the the system. top cover and remove the top cover. 2. Remove the one screw securing NOTE: One of the the big handle and screws is located then remove the big underneath the handle.

  • Page 42: Control Board Removal

    9.3. Control Board Removal 9.3.1. MCB024S4S-1P and MHB024S4S-1P 1. Remove the five screws and disconnect the hooks to open the electronic control box cover. 2. Disconnect the connector for fan motor from the electronic control board. 3. Remove the connector for the compressor. 4.

  • Page 43: Mcb009S4S-1P, Mcb012S4S-1P, Mcb018S4S-1P, Mhb009S4S-1P, Mhb012S4S-1P, And Mhb018S4S-1P

    9.3.2. MCB009S4S-1P, MCB012S4S-1P, MCB018S4S-1P, MHB009S4S-1P, MHB012S4S-1P, and MHB018S4S-1P 1. Remove the five screws and 2. Disconnect the disconnect the compressor connec- hooks to open the tor and remove the electronic control grounding screw. box cover. 3. Pull out the wires from electrical 4.

  • Page 44: Mcb012S4S-1L, Mhb009S4S-1L

    9.3.3. MCB012S4S-1L, MHB009S4S-1L and MHB012S4S-1L 1. Disconnect the 2. Pull out the wires from compressor electrical supporting connector and plate and turn over remove the the electronic control grounding screw. assembly. 3. Remove the four 4. Remove the two hooks to remove hooks to remove the the control box sub- fixing board.

  • Page 45: Outdoor Unit Fan And Fan Motor Disassembly (All Models)

    9.4. Outdoor Unit Fan and Fan Motor Disassembly (All Models) 9.4.1. Fan Disassembly 1. Remove the nut securing the fan with a spanner 2. Remove the fan. 9.4.2. Fan Motor Removal 1. Remove the four screws securing the fan motor. 2.

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Mwcb seriesMhb seriesMwhb series

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