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Model
U-4LE1E5 U-4LE1E8 U-5LE1E5 U-5LE1E8 U-6LE1E5 U-6LE1E8 S-15M S-22M S-28M S-36M S-45M S-60M S-73M S-90M S-106M S-140M S-160M
Pages
127
Size
7.63 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner / MINI VRF SYSTEM
File
u-4le1e5-u-4le1e8-u-5le1e5-u-5le1e8-u-6le1e5-u-6le.pdf
Date
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Panasonic U-4LE1E5 / U-4LE1E8 / U-5LE1E5 / U-5LE1E8 / U-6LE1E5 / U-6LE1E8 / S-15M / S-22M / S-28M / S-36M / S-45M / S-60M / S-73M / S-90M / S-106M / S-140M / S-160M Service Manual ▷ View online

5 - 37
5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
Was EEPROM replaced when PC board was replaced?
1-1
2-1
Replace EEPROM
 
Yes
No
1 Check the 
control 
PC board
L10 Outdoor Unit Capacity Not Yet Setup Error
Error Detection Method
Error Diagnosis
1.
2.
Set an applicable capacity value on the item code 81 display of maintenance remote 
controller.
2-1
2 Installation
or setting
related
It is judged an error when outdoor unit capacity not yet setup or systematically unauthorized setting.
Check : Connect the outdoor maintenance remote controller and check whether item code 81 outdoor capacity value 
shows "0" or unauthorized capacity is set on the detailed setting mode display of the outdoor EEPROM. 
If the capacity value of the item code 81 with the outdoor maintenance remote controller is incorrect, recorrect and 
set it again.
•
* After setting the capacity value, be sure to reset the power supply switches of both indoor and outdoor units.
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5 - 38
5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
L18 4-way valve operation failure
Error Detection Method
Error Diagnosis
It is judged an error when during heating operation (Comp. ON), the highest detected temperature at an outdoor unit
heat exchanger (C1) was 20°C or more above the outdoor air temperature (Air Temp.) continuously for 5 minutes or 
longer, or the detected suction temperature (SCT) was 20°C or more above the outdoor air temperature continuously 
for 5 minutes or longer.
1.
2.
Is the connector wired from the 4-WAY valve plugged in the CN-20S 
connector on the HIC PC board properly?
1-1
1-2
Correct connector
 
Yes
No
2
Has the 4-way valve wiring become opened?
1-2
Is the wire from the coil for controlling the 4-way valve firmly 
connected to the 4-way valve?
1-3
4-way valve 
1 PC board 
wiring
Correct wiring
1-3
Yes
No
2-1
Correct connector
Yes
No
During heating mode (Comp. ON), insert and remove the connector 
wired from the 4-WAY valve into or from CN-20S connector on the 
HIC PC board. At the same time, does the ON & OFF sounds occur 
from the 4-way valve?
2-1
2-2
Replace HIC 
PC board
 
Yes
No
During heating mode (Comp. ON), does the alarm code L18 
reproduce for 5 minutes or longer after insertion and removal of 
CN-20S connector wired from the 4-way valve connector on the 
HIC PC board  ?
2-2
The parts inside the 4-way valve might have fixed at the cooling side.
Replace the 4-way valve
2-3
2-3
See what happens
Yes
No
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5 - 39
5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
P03 Compressor Discharge Temperature Error
Error Detection Method
Error Diagnosis
1.
2.
When the discharge temperature is over 106°C.
•
1-1
1-2
2-1
2-2
Adjust the 
refrigerant amount
Replace CR board
Yes
No
1 Adjustment 
to 
refrigerant 
charge
Yes
No
2-2
2-3
2-4
Avoid clogging
2-3
2-4
Replace the 
electronic control 
valve
Yes
No
2 Blockage in 
refrigerant 
circuit
Yes
No
Tends to have insufficient refrigerant charge in the system.
Service valve inside the outdoor unit closed
Additional 
refrigerant charge
2-2
Yes
No
Open service valve
Replace CR board
Yes
No
Replace the strainer
Are the tubes clogged?
Is the outdoor unit’s electronic control valve operating correctly? 
(Check for debris clogging the electronic control valve, a problem 
with the electronical coil and/or the control PC board.)
Is it observable difference in status of the dew or frost between 
the strainer’s primary and secondary sides?
Not additional refrigerant charged
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5 - 40
5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
The socket of the high pressure switch is securely inserted in the 
PC board. The wiring is not opened.
1-1
1-2
Correct connection 
and/or wiring
Yes
No
Even if parts near the high pressure switch are shaken quite a lot, 
the high pressure cutoff will be activated. 
Even if the covering is in good condition, in several cases vibration 
has caused wiring inside to open.
1-2
Replace the 
high pressure 
switch (wiring)
2-1
Yes
No
1 High 
pressure
switch
Service valve inside the outdoor unit closed
2-1
Open the service 
valve
2-2
Yes
No
There is an extreme difference in temperature in/out of the service 
valve.
2-2
2-3
3-1
Yes
No
Check the flare connection, someone may have forgotten to remove the bonnet.
If there is a problem within the service valve, replace the valve.
2-3
While cooling is operating an alarm is occurred.
3-1
3-2
3-5
Yes
No
The intake temperature (ambient temperature) of the outdoor unit’s 
heat exchanger is above 46°C.
3-2
Prevent air short 
circuit
3-3
Yes
No
The outdoor unit’s heat exchanger is clogged.
3-3
Clean the heat 
exchanger
3-4
Yes
No
Check whether the outdoor unit fan is normal or if the sockets are 
firmly pressed onto the plugs on the outdoor PC board, as well as 
if any wiring is opened. 
Are these checking finished without fail?
3-4
4-1
Replace the outdoor
unit fan. 
Correct connection 
and/or wiring
Yes
No
While heating is operating an alarm is occurred.
3-5
3-6
4-1
Yes
No
2 Service
valve
3 Problem
around the
heat
exchanger
P04 Actuation of High Pressure Switch
Error Detection Method
Error Diagnosis
It is judged an error if the internal circuit of the high pressure switch is dead.
The electronic circuitry of the high pressure switch is cut off if the pressure at the pressure sensor port of the high pressure
switch reaches 3.80 MPa. Once it is cut off, it remains cut off until the pressure drops to 3.15 MPa.
The high pressure switch is malfunctioning.
•
Service valve inside the outdoor unit closed
•
There is a short air circuit through the outdoor unit’s heat exchanger. (when cooling)
•
The outdoor unit’s fan is broken. (when cooling)
•
The outdoor unit’s heat exchanger is clogged. (when cooling)
•
There is a short air circuit at the indoor unit. (when heating)
•
The filter of the indoor unit is clogged. (when heating)
•
The fan of the indoor unit is broken or the fan motor is malfunctioning. (when heating)
•
The refrigerant circuit is closed and the high pressure is increasing abnormally high. 
(solenoid valve or expansion valve not activated, a stuck check valve, etc.)
•
Refrigerant overcharged.
•
Nitrogen or air contaminated in the refrigerant system
•
1.
2.
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