CS-YE9MKX, CS-YE12MKX, CS-YE18MKX, CU-YE9MKX, CU-YE12MKX, CU-YE18MKX - Panasonic Air Conditioner Service Manual (repair manual). Page 39

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Cooling Mode 

Heating Mode 

Condition of the  
air conditioner 

Low Pressure 

High 
Pressure 

Electric current 
during 
operation 

Low Pressure 

High 
Pressure 

Electric current 
during operation

Insufficient 
refrigerant 
(gas leakage) 

Ô 

Ô 

Ô 

Ô 

Ô 

Ô 

Clogged capillary 
tube or 
strainer 

Ô 

Ô 

Ô 

Ò 

Ò 

Ò 

Short circuit in the 
indoor unit 

Ô 

Ô 

Ô 

Ò 

Ò 

Ò 

Heat radiation 
deficiency 
of the outdoor unit 

Ò 

Ò 

Ò 

Ô 

Ô 

Ô 

Inefficient 
compression 

Ò 

Ô 

Ô 

Ò 

Ô 

Ô 

• Carry out the measurement of pressure, electric current, and temperature fifteen minutes after an operation is 
started. 
 

When the air-conditioner is stopped due to malfunction detected by itself, the operation can be restarted using AUTO 
Switch on the indoor unit. In forced operation, the frequency for compressor and fan speed can not be changed and 
the signal receiving sound is different. 
Normal Operation ON: “pep” 
Forced Operation ON: “pep”, “pep”, “pep”, “pep” 
Stop: “pep” 
Note: Refer to the Diagnosis Code Table for the malfunction when forced operation is not available.

 

1. Keeping the CHECK button on the remote controller depressed for 5 seconds, error code ranging fromH11 to H99 

can be displayed on the remote controller. 

2. The error code is changed and diagnosis signal is transmitted to the indoor unit by pressing the Temp Up button on 

the remote control. 

3. When the malfunction of the air-conditioner matches the error code on the remote control, four beeps can be heard 

from the indoor unit and the operation indicator will light up. 

4. Keep the CHECK button depressed continuously for 5 seconds to cancel the diagnosis function.