Panasonic CS-ME9PB4EA Service Manual
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Panasonic CS-ME9PB4EA Service Manual

Panasonic CS-ME9PB4EA Service Manual

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Please file and use this manual together with the service manual for Model No. CU-2E15PBE CU-2E18PBE CU-3E18PBE
CU-4E23PBE, Order No. PAPAMY1301048CE
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service
or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.
WARNING
PRECAUTION OF LOW TEMPERATURE
Order No: PAPAMY1301095CE

Air Conditioner

Indoor Unit
CS-ME9PB4EA
CS-ME12PB4EA
CS-ME18PB4EA
CS-ME21PB4EA
Destination
Europe
© Panasonic Corporation 2013

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Summary of Contents for Panasonic CS-ME9PB4EA

  • Page 1: Air Conditioner

    PRECAUTION OF LOW TEMPERATURE In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit. © Panasonic Corporation 2013...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS 14.5 Self-diagnosis Method ........55 1. Safety Precautions ..........3 15. Disassembly and Assembly Instructions ..78 2. Specifications ............. 5 15.1 Disassembly of Parts ........78 3. Features ............. 27 16. Exploded View and Replacement Parts 4. Location of Controls and Components ..28 List ..............81 Indoor Unit ..........

  • Page 3: Safety Precautions

    1. Safety Precautions Read the following “SAFETY PRECAUTIONS” carefully before perform any servicing. Electrical work must be installed or serviced by a licensed electrician. Be sure to use the correct rating of the power plug and main circuit for the model installed. The caution items stated here must be followed because these important contents are related to safety.
  • Page 4 WARNING 19. During installation, install the refrigerant piping properly before run the compressor. (Operation of compressor without fixing refrigeration piping and valves at opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc). 20.

  • Page 5: Specifications

    2. Specifications MODEL INDOOR / OUTDOOR CS-ME9PB4EA / CU-2E15PBE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.10 2.50 3.50 Capacity BTU/h 3750 8530 11900 Running Current 3.15 Input Power 1.00k Annual Consumption 5.00 3.73 3.50...
  • Page 6 MODEL INDOOR / OUTDOOR CS-ME9PB4EA / CU-2E15PBE Height (I/D) Dimension Width (I/D) Depth (I/D) Weight Net (I/D) Pipe Diameter Piping mm (inch) 6.35 (1/4) / 9.52 (3/8) (Liquid / Gas) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat)
  • Page 7 MODEL INDOOR / OUTDOOR CS-ME9PB4EA / CU-2E18PBE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.10 2.50 3.50 Capacity BTU/h 3750 8530 11900 Running Current 3.15 Input Power 1.00k Annual Consumption 5.00 3.73 3.50 dB-A...
  • Page 8 MODEL INDOOR / OUTDOOR CS-ME9PB4EA / CU-2E18PBE Pipe Diameter Piping mm (inch) 6.35 (1/4) / 9.52 (3/8) (Liquid / Gas) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat Exchanger Row x Stage x FPI 2 x 10 x 18 1330 x 210 x 25.4...
  • Page 9 MODEL INDOOR / OUTDOOR CS-ME9PB4EA / CU-3E18PBE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.80 2.50 2.90 Capacity BTU/h 6140 8530 9890 Running Current 3.00 Input Power Annual Consumption 5.29 3.97 3.58 dB-A 34 / 26...
  • Page 10 MODEL INDOOR / OUTDOOR CS-ME9PB4EA / CU-3E18PBE Pipe Diameter Piping mm (inch) 6.35 (1/4) / 9.52 (3/8) (Liquid / Gas) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat Exchanger Row x Stage x FPI 2 x 10 x 18 1330 x 210 x 25.4...
  • Page 11 MODEL INDOOR / OUTDOOR CS-ME9PB4EA / CU-4E23PBE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.80 2.50 2.90 Capacity BTU/h 6140 8530 9890 Running Current 3.20 Input Power Annual Consumption 5.29 3.97 3.58 dB-A 34 / 26...
  • Page 12 MODEL INDOOR / OUTDOOR CS-ME9PB4EA / CU-4E23PBE Pipe Diameter Piping mm (inch) 6.35 (1/4) / 9.52 (3/8) (Liquid / Gas) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat Exchanger Row x Stage x FPI 2 x 10 x 18 1330 x 210 x 25.4...
  • Page 13 MODEL INDOOR / OUTDOOR CS-ME12PB4EA / CU-2E15PBE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.10 3.20 4.00 Capacity BTU/h 3750 10900 13600 Running Current 4.30 Input Power 1.22k Annual Consumption 5.00 3.48 3.28 dB-A 34 / 26 Indoor Noise (H / L) Power Level dB...
  • Page 14 MODEL INDOOR / OUTDOOR CS-ME12PB4EA / CU-2E15PBE Pipe Diameter Piping mm (inch) 6.35 (1/4) / 9.52 (3/8) (Liquid / Gas) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat Exchanger Row x Stage x FPI 2 x 10 x 18 1330 x 210 x 25.4 Size (W x H x L)
  • Page 15 MODEL INDOOR / OUTDOOR CS-ME12PB4EA / CU-2E18PBE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.10 3.20 4.00 Capacity BTU/h 3750 10900 13600 Running Current 4.30 Input Power 1.22k Annual Consumption 5.00 3.48 3.28 dB-A 34 / 26 Indoor Noise (H / L) Power Level dB...
  • Page 16 MODEL INDOOR / OUTDOOR CS-ME12PB4EA / CU-2E18PBE Pipe Diameter Piping mm (inch) 6.35 (1/4) / 9.52 (3/8) (Liquid / Gas) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat Exchanger Row x Stage x FPI 2 x 10 x 18 1330 x 210 x 25.4 Size (W x H x L)
  • Page 17 MODEL INDOOR / OUTDOOR CS-ME12PB4EA / CU-3E18PBE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.80 3.20 3.80 Capacity BTU/h 6140 10900 13000 Running Current 3.70 Input Power 1.36k Annual Consumption 5.29 4.00 2.79 dB-A 34 / 26 Indoor Noise (H / L) Power Level dB...
  • Page 18 MODEL INDOOR / OUTDOOR CS-ME12PB4EA / CU-3E18PBE Pipe Diameter Piping mm (inch) 6.35 (1/4) / 9.52 (3/8) (Liquid / Gas) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat Exchanger Row x Stage x FPI 2 x 10 x 18 1330 x 210 x 25.4 Size (W x H x L)
  • Page 19 MODEL INDOOR / OUTDOOR CS-ME12PB4EA / CU-4E23PBE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.80 3.20 3.80 Capacity BTU/h 6140 10900 13000 Running Current 3.90 Input Power 1.36k Annual Consumption 5.29 4.00 2.79 dB-A 34 / 26 Indoor Noise (H / L) Power Level dB...
  • Page 20 MODEL INDOOR / OUTDOOR CS-ME12PB4EA / CU-4E23PBE Pipe Diameter Piping mm (inch) 6.35 (1/4) / 9.52 (3/8) (Liquid / Gas) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat Exchanger Row x Stage x FPI 2 x 10 x 18 1330 x 210 x 25.4 Size (W x H x L)
  • Page 21 MODEL INDOOR / OUTDOOR CS-ME18PB4EA / CU-3E18PBE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.90 5.00 5.70 Capacity BTU/h 6480 17100 19400 Running Current 6.80 Input Power 1.55k 2.13k Annual Consumption 5.59 3.23 2.68 dB-A 36 / 28 Indoor Noise (H / L)
  • Page 22 MODEL INDOOR / OUTDOOR CS-ME18PB4EA / CU-3E18PBE 6.35 (1/4) / 9.52 (3/8) Pipe Diameter Piping mm (inch) (Liquid / Gas) (Use CZ-MA1P to convert ID gas side tube connector 12.7 9.52) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat...
  • Page 23 MODEL INDOOR / OUTDOOR CS-ME18PB4EA / CU-4E23PBE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.90 5.00 5.70 Capacity BTU/h 6480 17100 19400 Running Current 7.20 Input Power 1.55k 2.13k Annual Consumption 5.59 3.23 2.68 dB-A 36 / 28 Indoor Noise (H / L)
  • Page 24 MODEL INDOOR / OUTDOOR CS-ME18PB4EA / CU-4E23PBE 6.35 (1/4) / 9.52 (3/8) Pipe Diameter Piping mm (inch) (Liquid / Gas) (Use CZ-MA1P to convert ID gas side tube connector 12.7 9.52) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat...
  • Page 25 MODEL INDOOR / OUTDOOR CS-ME21PB4EA / CU-4E23PBE Performance Test Condition EUROVENT Phase, Hz Single, 50 Power Supply Min. Mid. Max. 1.90 6.00 6.20 Capacity BTU/h 6480 20500 21100 Running Current 9.20 Input Power 2.03k 2.33k Annual Consumption 1015 5.59 2.96 2.66 dB-A 41 / 33...
  • Page 26 MODEL INDOOR / OUTDOOR CS-ME21PB4EA / CU-4E23PBE Pipe Diameter Piping mm (inch) 6.35 (1/4) / 12.7 (1/2) (Liquid / Gas) Inner Diameter Drain Hose Length Fin Material Aluminium (Pre Coat) Fin Type Slit Fin Indoor Heat Exchanger Row x Stage x FPI 2 x 10 x 18 1330 x 210 x 25.4 Size (W x H x L)

  • Page 27: Features

    Features Inverter Technology Wider output power range Energy saving Quick Cooling Quick Heating More precise temperature control Environment Protection Non-ozone depletion substances refrigerant (R410A) Long Installation Piping Long piping up to 20 meter (2E15/18PBE), 25 meter (3E18PBE and 4E23PBE) for 1 room Easy to use remote control Quality Improvement Random auto restart after power failure for safety restart operation...

  • Page 28: Location Of Controls And Components

    4. Location of Controls and Components Indoor Unit Outdoor Unit Remote Control...

  • Page 29: Dimensions

    5. Dimensions Indoor Unit...

  • Page 30: Refrigeration Cycle Diagram

    6. Refrigeration Cycle Diagram...

  • Page 31: Block Diagram

    7. Block Diagram...

  • Page 32: Wiring Connection Diagram

    8. Wiring Connection Diagram Indoor Unit...

  • Page 33: Electronic Circuit Diagram

    9. Electronic Circuit Diagram Indoor Unit...

  • Page 34: Printed Circuit Board

    10. Printed Circuit Board 10.1 Indoor Unit 10.1.1 Main Printed Circuit Board...

  • Page 35: Installation Instruction

    11. Installation Instruction 11.1 Indoor Unit Installation Diagram 11.2 SELECTING THE LOCATION FOR THE INDOOR UNIT Provide a check port on the piping side ceiling for repair and maintenance. Install the indoor unit once the following conditions are satisfied and after receiving the customer approval. The indoor unit must be within a maintenance space.

  • Page 36: Installation Of Indoor Unit

    NOTE Thoroughly study the following installation locations In such places as restaurants and kitchens, considerable amount of oil steam and flour adhere to the turbo fan, the fin of the heat exchanger and the drain pump, resulting in heat exchange reduction, spraying, dispersing of water drops, drain pump malfunction, etc.

  • Page 37: Refrigerant Piping

    POSITIONS OF AIR CONDITIONER BODY AND CEILING SURFACE 11.4 REFRIGERANT PIPING Refrigerant is charged to the outdoor unit. For details, see the manual for installation work of outdoor unit. (Additional charging, etc.) Brazing for piping. Execute brazing before tightening the flare nut.

  • Page 38: Indoor Unit Drain Piping

    11.5 INDOOR UNIT DRAIN PIPING During drain piping connection, be careful not to exert extra force on the drain port at the indoor unit. The outside diameter of the drain connection at the indoor unit is 32mm. Piping material: Polyvinyl chloride pipe VP-25 and pipe fittings. Be sure to perform heat insulation on the drain piping.

  • Page 39: Heat Insulation

    11.6 HEAT INSULATION Be sure to perform heat insulation on the drain, liquid and gas piping. Imperfection in heat insulation work leads to water leakage. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120°C). Precautions in high humidity circumstance.

  • Page 40: Connecting The Cable To The Indoor Unit

    11.7 CONNECTING THE CABLE TO THE INDOOR UNIT Remove the mounting screw, remove the control box cover, and then connect the wires by following the procedure given in the illustration. Connecting cable between indoor unit and outdoor unit shall be approved polychloroprene sheathed 4 x 1.5 mm flexible cord, type designation 60245 IEC 57 or heavier cord.

  • Page 41: Installation Of Decorative Panel

    11.8 INSTALLATION OF DECORATIVE PANEL The decorative panel has its installation direction. Confirm the direction by displaying the piping side. Remove the air inlet grille by moving the catchers to center. Fitting the decorative panel Temporarily secure the fixing screws (3 pcs.) before fitting the decorative panel. (For temporarily securing the front grille.) Place decorative panel on the screws (3 pcs.) before fitting, move decorative panel as illustrated and tighten all the screws (4 pcs.).
  • Page 42 Open the indoor control box cover. (2 pcs) Insert firmly the connector of cosmetic louver to indoor PCB CN-STM1, CN-STM2 and CN-DISP. Be caution not to clamp the cord in between control board and control board cover. Be caution not to clamp the cord in between control board and control board cover.

  • Page 43: Operation And Control

    12. Operation and Control 12.1 Basic Function Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and performing temperature shifting.

  • Page 44: Heating Operation

    12.1.4 Heating Operation 12.1.4.1 Thermostat control Compressor is OFF when Intake Air Temperature - Internal Setting Temperate > +2.0°C. Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature < Compressor OFF point. 12.1.5 Automatic Operation This mode can be set using remote control and the operation is decided by remote control setting temperature,...

  • Page 45: Airflow Direction

    ii. Auto Fan Speed [Cooling, Dry] According to room temperature and setting temperature, indoor fan speed is determined automatically. The indoor fan will operate according to pattern below. [Heating] According to indoor pipe temperature, automatic heating fan speed is determined as follows. B.

  • Page 46: Quiet Operation (Cooling Mode/Cooling Area Of Soft Dry Mode)

    12.3 Quiet operation (Cooling Mode/Cooling area of Soft Dry Mode) A. Purpose To provide quiet cooling operation compare to normal operation. B. Control condition a. Quiet operation start condition When “quiet” button at remote control is pressed. Quiet LED illuminates. b.

  • Page 47: Powerful Mode Operation

    C. Control contents a. Fan Speed Auto Indoor FM RPM depends on pipe temperature sensor of indoor heat exchanger. Auto fan speed is changed from normal setting to quiet setting of respective fan speed. This is to reduce sound of Hi, Me, Lo for 3dB. b.

  • Page 48: Indication Panel

    12.7 Indication Panel POWER TIMER QUIET POWERFUL AIR SWING Color Green Orange Orange Orange Orange Light ON Operation ON Timer Setting ON Quiet Mode ON Powerful Mode ON Auto Air Swing ON Light OFF Operation OFF Timer Setting OFF Quiet Mode OFF Powerful Mode OFF Auto Air Swing OFF Note:...

  • Page 49: Servicing Mode

    13. Servicing Mode 13.1 Auto OFF/ON Button AUTO OPERATION MODE The Auto operation will be activated immediately once the Auto OFF/ON button is pressed. This operation can be used to operate air conditioner with limited function if remote control is misplaced or malfunction. TEST RUN OPERATION (FOR PUMP DOWN/SERVICING PURPOSE) The Test Run operation will be activated if the Auto OFF/ON button is pressed continuously for more than 5 seconds.

  • Page 50: Select Remote Control Transmission Code

    13.2 Select Remote Control Transmission Code There are 4 types of remote control transmission code could be selected and stored in EEPROM of indoor unit. The indoor unit will only operate when received signal with same transmission code from remote control. This could prevent signal interference when there are 2 or more indoor units installed nearby together.

  • Page 51: Troubleshooting Guide

    14. Troubleshooting Guide 14.1 Refrigeration Cycle System In order to diagnose malfunctions, make sure that there are no Normal Pressure and Outlet Air Temperature (Standard) electrical problems before inspecting the refrigeration cycle. Gas pressure Outlet air Such problems include insufficient insulation, problem with the MPa (kg/cm temperature (°C) power source, malfunction of a compressor and a fan.

  • Page 52: Relationship Between The Condition Of The Air Conditioner And Pressure And Electric Current

    14.2 Relationship Between The Condition Of The Air Conditioner And Pressure And Electric Current Cooling Mode Heating Mode Condition of the Electric current Electric current air conditioner Low Pressure High Pressure Low Pressure High Pressure during operation during operation Insufficient refrigerant (gas leakage) Clogged capillary tube or Strainer...

  • Page 53: Breakdown Self Diagnosis Function

    14.3 Breakdown Self Diagnosis Function 14.3.1 Self Diagnosis Function (Three Digits Alphanumeric Code) Every press of the button (up or down) will Once abnormality has occurred during operation, increase abnormality numbers and transmit the unit will stop its operation, and Timer LED abnormality code signal to the main unit.

  • Page 54: Error Codes Table

    14.4 Error Codes Table Note: “O” - Frequency measured and fan speed fixed. The memory data of error code is erased when the power supply is cut off, or press the Auto Switch until “beep” sound heard following by pressing the “CHECK” button at Remote Control. Although operation forced to stop when abnormality detected, emergency operation is possible for certain errors (refer to Error Codes Table) by using Remote Control or Auto Switch at indoor unit.

  • Page 55: Self-Diagnosis Method

    14.5 Self-diagnosis Method 14.5.1 H11 (Indoor/Outdoor Abnormal Communication) Malfunction Decision Conditions During startup and operation of cooling and heating, the data received from outdoor unit in indoor unit signal transmission is checked whether it is normal. Malfunction Caused Faulty indoor unit PCB. Faulty outdoor unit PCB.
  • Page 56 14.5.2 H12 (Indoor/Outdoor Capacity Rank Mismatched) Malfunction Decision Conditions During startup, error code appears when different types of indoor and outdoor units are interconnected. Malfunction Caused Wrong models interconnected. Wrong indoor unit or outdoor unit PCBs mounted. Indoor unit or outdoor unit PCBs defective. Indoor-outdoor unit signal transmission error due to wrong wiring.
  • Page 57 14.5.3 H14 (Indoor Intake Air Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the indoor intake air temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor.
  • Page 58 14.5.4 H15 (Compressor Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor compressor temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB. Troubleshooting...
  • Page 59 14.5.5 H16 (Outdoor Current Transformer Open Circuit) Malfunction Decision Conditions A current transformer (CT) is detected by checking the compressor running frequency (≥ rated frequency) and CT detected input current (less than 0.65A) for continuously 20 seconds. Malfunction Caused CT defective Outdoor PCB defective Compressor defective (low compression) Troubleshooting...
  • Page 60 14.5.6 H19 (Indoor Fan Motor – DC Motor Mechanism Locked) Malfunction Decision Conditions The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor (feedback of rotation > 2550rpm or < 50rpm) Malfunction Caused Operation stops due to short circuit inside the fan motor winding.
  • Page 61 14.5.7 H23 (Indoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB.
  • Page 62 14.5.8 H24 (Indoor Pipe Temperature Sensor 2 Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger temperature sensor 2 are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor.
  • Page 63 14.5.9 H27 (Outdoor Air Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor air temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB.
  • Page 64 14.5.10 H28 (Outdoor Pipe Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB.
  • Page 65 14.5.11 H30 (Compressor Discharge Temperature Sensor Abnormality) Malfunction Decision Conditions During startup and operation of cooling and heating, the temperatures detected by the outdoor discharge pipe temperature sensor are used to determine sensor errors. Malfunction Caused Faulty connector connection. Faulty sensor. Faulty PCB.
  • Page 66 14.5.12 H97 (Outdoor Fan Motor – DC Motor Mechanism Locked) Malfunction Decision Conditions The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor. Malfunction Caused Operation stops due to short circuit inside the fan motor winding. Operation stops due to breaking of wire inside the fan motor.
  • Page 67 14.5.13 H98 (Indoor High Pressure Protection) Error Code will not display (no Timer LED blinking) but store in EEPROM Malfunction Decision Conditions During heating operation, the temperature detected by the indoor pipe temperature sensor is above 60°C. Malfunction Caused Air short circuit. Clogged air filter of the indoor unit.
  • Page 68 14.5.14 H99 (Indoor Freeze Prevention Protection: Cooling or Soft Dry) Error Code will not display (no Timer LED blinking) but store in EEPROM Malfunction Decision Conditions Freeze prevention control takes place (when indoor pipe temperature is lower than 2°C) Malfunction Caused Air short circuit.
  • Page 69 14.5.15 F11 (4-way valve Abnormality) Malfunction Decision Conditions When heating operation, when indoor pipe temperature is below 10°C When cooling operation, when indoor pipe temperature is above 45°C Malfunction Caused Connector in poor contact. Faulty sensor. Faulty outdoor unit PCB. 4-way valve defective.
  • Page 70 14.5.16 F90 (Power Factor Correction Protection) Malfunction Decision Conditions During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry at the outdoor unit main PCB senses abnormal high DC voltage level. Malfunction Caused DC voltage peak due to power supply surge. DC voltage peak due to compressor windings not uniform.
  • Page 71 14.5.17 F91 (Refrigeration Cycle Abnormality) Malfunction Decision Conditions During cooling, compressor frequency = Fcmax. During heating, compressor frequency > Fhrated. During cooling and heating operation, running current: 0.65A < I < 1.65A. During cooling, indoor intake - indoor pipe < 4°C. During heating, indoor pipe - indoor intake <...
  • Page 72 14.5.18 F93 (Compressor Rotation Failure) Malfunction Decision Conditions A compressor rotation failure is detected by checking the compressor running condition through the position detection circuit. Malfunction Caused Compressor terminal disconnect. Faulty Outdoor PCB. Faulty compressor. Troubleshooting...
  • Page 73 14.5.19 F95 (Cooling High Pressure Abnormality) Malfunction Decision Conditions During operation of cooling, when outdoor unit heat exchanger high temperature data (61°C) is detected by the outdoor pipe temperature sensor. Malfunction Caused Air short circuit at indoor unit. Dust accumulation on the indoor unit heat exchanger. 2/3 way valve closed.
  • Page 74 14.5.20 F96 (IPM Overheating) Malfunction Decision Conditions During operating of cooling and heating, when IPM temperature data (100°C) is detected by the IPM temperature sensor. Multi models only Compressor Overheating: During operation of cooling and heating, when the compressor OL is activated. Heat Sink Overheating: During operation of cooling and heating, when heat sink temperature data (90°C) is detected by the heat sink temperature sensor.
  • Page 75 14.5.21 F97 (Compressor Overheating) Malfunction Decision Conditions During operation of cooling and heating, when compressor tank temperature data (112°C) is detected by the compressor tank temperature sensor. Malfunction Caused Refrigerant shortage (refrigerant leakage). 2/3 way valve closed. Detection error due to faulty compressor tank temperature sensor. Troubleshooting...
  • Page 76 14.5.22 F98 (Input Over Current Detection) Malfunction Decision Conditions During operation of cooling and heating, when an input over-current (15.06A) is detected by checking the input current value being detected by current transformer (CT) with the compressor running. Malfunction Caused Over-current due to compressor failure.

  • Page 77: Troubleshooting

    14.5.23 F99 (Output Over Current Detection) Malfunction Decision Conditions During operation of cooling and heating, when an output over-current (20.2A) is detected by checking the current that flows in the inverter DC peak sensing circuitry. Malfunction Caused DC peak due to compressor failure. DC peak due to defective power transistor(s).

  • Page 78: Disassembly And Assembly Instructions

    15. Disassembly and Assembly Instructions WARNING High Voltage are generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding with repair work. Failure to heed this caution may result in electric shocks. 15.1 Disassembly of Parts Open the Intake Grille from the Front Grille by moving the catchers to center (Fig.1).
  • Page 79 To remove the Electronic Controller, release the 6 hooks that hold it to the Control Board (Fig. 4). Fig. 4 Remove the Front Grille by removing the screw A and screws B, C & D half way open (Fig. 5). Fig.
  • Page 80 Remove the Fan Motor by release the Fan Motor lead wire connectors and Fan Motor screws (Fig. 8). Fig. 8...

  • Page 81: Exploded View And Replacement Parts List

    16. Exploded View and Replacement Parts List 16.1 Indoor Unit...
  • Page 82 Note: The above exploded view is for the purpose of parts disassembly and replacement. The non-numbered parts are not kept as standard service parts.
  • Page 83 <Model: CS-ME9PB4EA CS-ME12PB4EA CS-ME18PB4EA CS-ME21PB4EA> REF. SAFETY PART NAME & DESCRIPTION REMARK ME9PB4EA ME12PB4EA ME18PB4EA ME21PB4EA BASE PAN ASS’Y CWD52K1100 ← ← ← INNER POLYSTYRENE COMPLETE CWG07C1047 ← ← ← CABINET SIDE PLATE ASS’Y CWE041121 ← ← ← CABINET SIDE PLATE ASS’Y CWE041122 ←...
  • Page 84 REF. SAFETY PART NAME & DESCRIPTION REMARK ME9PB4EA ME12PB4EA ME18PB4EA ME21PB4EA OPERATING INSTRUCTION CWF568974 ← ← ← INSTALLATION INSTRUCTION CWF615797 ← ← ← INSTALLATION INSTRUCTION CWF615836 ← ← ← INSTALLATION INSTRUCTION CWF615837 ← ← ← INSTALLATION INSTRUCTION CWF615838 ← ← ←...

  • Page 85: Cz-Bt20E (Front Grille Complete)

    16.2 CZ-BT20E (Front Grille Complete) Note: The above exploded view is for the purpose of parts disassembly and replacement. The non-numbered parts are not kept as standard service parts.
  • Page 86 SAFETY REF. NO. PART NAME & DESCRIPTION PART NO. FRONT GRILLE - COMPLETE CWE11C3105 FRONE - FRONT GRILLE CO. CWE11C3353 A.S MOTOR DC SINGLE 12V 250 OHM CWA981105J BRACKET - A.S.MOTOR CWD932522 VANE CWE241159 SHAFT CWH631038 SHAFT CWH631045 CONNECTOR - SHAFT CWH081007 BEARING CWH641008...

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