CS-C18HKD, CS-C24HKD, CU-C18HKD, CU-C24HKD - Panasonic Air Conditioner Service Manual (repair manual). Page 2

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10 Printed Circuit Board ------------------------------------------ 17

10.1. Indoor Unit (Main Printed Circuit Board) ----------- 17
10.2. Indoor Unit (Power Printed Circuit Board) --------- 19
10.3. Indicator panel -------------------------------------------- 20

11 Installation Instruction ---------------------------------------- 21

11.1. Select The Best Location ------------------------------ 21
11.2. Indoor Unit ------------------------------------------------- 22
11.3. Outdoor Unit ----------------------------------------------- 25

12 Operation Control----------------------------------------------- 28

12.1. Cooling Operation---------------------------------------- 28
12.2. Soft Dry Operation --------------------------------------- 29
12.3. Automatic Operation------------------------------------- 30
12.4. Indoor Fan Speed Control ----------------------------- 30
12.5. Outdoor Fan Speed Control --------------------------- 32
12.6. Vertical Airflow Direction Control --------------------- 32
12.7. Horizontal Airflow Direction Control ----------------- 33
12.8. Powerful Operation -------------------------------------- 33
12.9. Quiet Operation------------------------------------------- 34

12.10. Timer Control---------------------------------------------- 35

12.11. Random Auto Restart Control------------------------- 35

12.12. Remote Control Signal Receiving Sound ---------- 35
12.13. Patrol Operation ------------------------------------------ 36
12.14. e-ion Operation ------------------------------------------- 39

13 Operation Control----------------------------------------------- 42

13.1. Restart Control (Time Delay Safety Control) ----- 42
13.2. 7 Minutes Time Save Control------------------------- 42
13.3. 60 Seconds Forced Operation ----------------------- 42
13.4. Starting current Control--------------------------------- 42
13.5. Freeze Prevention Control ---------------------------- 42
13.6. Compressor Reverse Rotation Protection

Control------------------------------------------------------ 43

13.7. Dew Prevention Control-------------------------------- 43

14 Servicing Mode-------------------------------------------------- 44

14.1. Auto OFF/ON Button ----------------------------------- 44
14.2. Select Remote Control Transmission Code------- 44
14.3. Remote Control Button --------------------------------- 45

15 Troubleshooting Guide --------------------------------------- 46

15.1. Refrigeration cycle system ---------------------------- 46

16 Disassembly and Assembly Instructions -------------- 48

16.1. Indoor Electronic Controllers and Control

Board Removal Procedures -------------------------- 48

17 Technical Data --------------------------------------------------- 53

17.1. Thermostat Characteristics---------------------------- 53
17.2. Operation Characteristics ----------------------------- 54

18 Exploded View and Replacement Parts List----------- 58

18.1. Indoor Unit------------------------------------------------- 58
18.2. Outdoor UnitCU-C18HKD ----------------------------- 60
18.3. Outdoor UnitCU-C24HKD ----------------------------- 61

• 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. The meaning of each

indication used is as below. Incorrect installation or servicing due to ignoring of the instruction will cause harm or damage, and
the seriousness is classified by the following indications.

• The items to be followed are classified by the symbols:

• Carry out test run to confirm that no abnormality occurs after the servicing. Then, explain to user the operation, care and

maintenance as stated in instructions. Please remind the customer to keep the operating instructions for future reference.

This indication shows the possibility of causing death or serious injury.

This indication shows the possibility of causing injury or damage to properties.

This symbol denotes item that is PROHIBITTED from doing.

1.

Engage dealer or specialist for installation and servicing. If installation or servicing done by the user is defective, it will cause water 
leakage, electrical shock or fire.

2.

Install according to this installation instructions strictly. If installation is defective, it will cause water leakage, electrical shock or fire.

3.

Use the attached accessories parts and specified parts for installation and servicing. Otherwise, it will cause the set to fall, water leakage, 
fire or electrical shock.