DOWNLOAD Panasonic U-2E15GBE / U-2E18CBPG Service Manual ↓ Size: 2.48 MB | Pages: 47 in PDF or view online for FREE

33

H11

Indoor / outdoor abnormal 
communication

> 1 min after starting 
operation

Indoor fan    
operation only 
(single type only)

• Internal / external cable   

connections

• Indoor / Outdoor PCB

H12

Indoor unit capacity unmatched

—

—

• Indoor units total capacity

Multi only

H14

Intake air temperature unmatched

—

—

• Intake air temperature 

sensor (defective or 
disconnected)

H16

Outdoor Current Transformer 

—

—

• Decreased amount of 

refrigerant

• Outdoor PCB

H19

Indoor fan motor merchanism lock

—

—

• Fan motor
• Indoor PCB

H23

Indoor heat exchanger temperature 
sensor 

Continue for 5 sec.

—

• Heat exchanger temperature 

sensor (defective or 
disconnected)

H27

Outdoor air temperature sensor

Continue for 5 sec.

O

 (Single type only)

• Outdoor air temperature 

sensor (defective or 
disconnected)

H28

Outdoor heat exchanger temperature 
sensor 1

Continue for 5 sec.

O

 (Single type only)

• Outdoor heat exchanger 

temperature sensor 
(defective or disconnected)

H30

Outdoor discharge pipe temperature 
sensor

Continue for 5 sec.

—

• Outdoor discharge pipe 

temperature sensor 
(defective or disconnected)

H32

Outdoor heat exchanger temperature 
sensor 2 (discharge pipe temp)

Continue for 5 sec.

—

• Outdoor heat exchanger 

temperature sensor  
(defective or disconnected)

Multi only

H34

Outdoor heatsink temperature sensor at 
Control Board

Continue for 2 sec.

—

• Outdoor heatsink 

temperature sensor at 
Control Board (defective or 
disconnected)

Multi only

H36

Outdoor gas pipe temperature sensor 

Continue for 2 sec.

—

• Outdoor gas pipe 

temperature sensor 
(defective or disconnected)

Multi only

H37

Outdoor liquid pipe temperature sensor 

Continue for 2 sec.

—

• Outdoor liquid pipe 

temperature sensor 
(defective or disconnected)

Multi only

H39

Abnormal indoor operating unit or 
standby units

—

—

• Piping connection error
• Indoor/Outdoor connection 

cable connection error

Multi only

H41

Abnormal wiring or piping connection

—

—

• Wiring or piping connection

U-

2E15GBE

H97

Outdoor fan motor mechanism lock

—

—

• Outdoor Fan Motor

H98

Indoor high pressure protection

—

—

• Air filter dirty
• Air circulation short circuit

H99

Indoor heat exchanger freeze prevention

—

—

• Insufficient refrigerant 
• Air filter dirty

F11

Cooling / Heating cycle changeover 
abnormality

4 times occurences 
within 30 minutes

—

• 4-way valve
• V-coil

F17

Indoor standby units freezing

—

—

• Outdoor expansion valve 

leakage 

• Indoor unit pipe temperature 

sensor

Multi only

F90

PFC circuit protection

—

—

• Outdoor PCB
• Outdoor fan motor

F91

Refrigeration cycle abnormality

2 times occurrence 
within 20 minutes

—

• No refrigerant

(3-way valve is closed)

F93

Outdoor compressor abnormal revolution

4 times occurance 
within 20 minutes

—

• Compressor

F95

Cooling high pressure protection

4 times occurance 
within 20 minutes

—

• Outdoor refrigerant cycle

34

Note:
“O” - Frequency measured and fan speed fixed.

F96

IPM (power transistor) overheating 
protection

—

—

• Excess refrigerant
• Improper heat radiation
• Outdoor PCB

F97

Outdoor compressor overheating 
protection

4 times occurance 
within 10 minutes

—

• Insufficient refrigerant
• Compressor

F98

Total running current protection

3 times occurance 
within 20 minutes

—

• Excess refrigerant
• Improper heat radiation

F99

Outdoor Direct Current (DC) peak 
detection

7 times occurences

—

• Outdoor PCB
• Compressor

35

1. Remove the cabinet top plate (by removing the 4 screws).
2. Remove the 5 screws fixing the cabinet front plate,

release 6 hooks and pull the cabinet front plate toward
front side.

3. Remove the control board cover (remove 1 screw)
4. Remove the terminal cover (remove 2 screws)
5. Remove the terminal cover (top) and disconnect all the

lead wires (3 fasten tab) inside.

• When handling electronic controller, be careful of electrostatic discharge.
• Be sure to return the wiring to its original position.
• There are many high voltage components within the heat sink cover, so never touch the interior during operation. Wait at least two minutes after

power has been turned off.

36

6. Remove the control board cover.
7. Remove the 6 screws at the positions on the control

board indicated by arrows.

8. Disconnect the connectors and pipe sensor connected to

the compressor and reactor.

9. Remove the control board.

When pulling the control board upward, it may not be
possible to remove it because of the way in which the
ground wire and other wires are routed. In this case, it is
removed after the control board cover itself has been
removed.

1. Remove the cabinet top plate and cabinet front plate
2. Remove the propeller fan by removing the nut turning

clockwise at its center.

3. Disconnect the connector of the fan motor from the

control board.

4. Loosen the 4 screws at the fan motor mounting then

remove the fan motor.