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Model
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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 - 33
5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
Turn the power on again and run the outdoor unit.
Is alarm occurred after operation?
1-1
Replace CR board.
See what happens.
Yes
No
1 Check the 
control
PC board
H03 Compressor CT Sensor (Current Sensor) Unplugged
Error Detection Method
Error Diagnosis
If 18A or greater is detected when the compressor is stopped (alarm triggered even if the connector is unplugged).
•
If no current is detected even though a compressor is running.
•
1.
2.
It is judged an error based on the criteria listed below.
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5 - 34
5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
H31 HIC Error
Error Detection Method
Error Diagnosis
HIC overcurrent due to HIC fault
1.
2.
•
HIC abnormal heat caused by defective HIC or HIC radiation error
•
Signal line is not connected properly or opened between the HIC and the 
outdoor CR
 board.
•
Measure with an analog tester. (Set to the k ohm range)
•
Measure the board by itself. (Remove wires connected from other parts.)
•
Measure using IPM terminals.
Conforming part resistance value (measure with an analog tester)
•
Excepting the parts of “
value is “0 = short-circuit”.
”, it is acceptable if a small resistance value appears as a reference value unless the 
•
HIC board IPM Pass/Fail Tests
It is judged an error if the computer detects an error signal from the HIC.
An error signal is issued by the HIC if abnormal heat occurs inside the HIC or if there is an overcurrent.
However, it is judged an error in the same way if the signal line from the HIC is not connected properly or opened.
1-1
1-2
2-1
3-1
Correct wiring (connector)
Correct wiring (connector)
3-1 : Single-phase model 
2-1 : 3-phase model
3-1
Replace wiring
Yes
No
1 Wiring 
between 
HIC &
outdoor 
control 
PC board 
Yes
Yes
No
No
3-2
4-1
4-2
4-1
Remove foreign matter
Replace the HIC PC board
4-2
Yes
No
3
2
HIC poor
radiation
Yes
No
Everything is normal in the wiring (power cord & signal line) 
between the HIC and the outdoor CR board. Check the 
wiring one by one with a tester if there is opened and 
grounding.
The heat dissipating surface on the back of the HIC is in good 
contact with the heat sink (heat dissipating fins) of the electrical 
box. Check for looseness in the fastening screws and the 
condition of the heat-conducting putty.
1-2
Tighten screw(s),
add putty
Yes
No
3-2
Refer to alarm code P16 
Yes
No
Replace the HIC PC board
4 HIC 
overcurrent
A good flow of cooling air passes through the heat sink 
(heat dissipating fins) of the electrical box. 
Check for debris blocking the fins.
The results of the pass/fail tests for the following HIC board 
IPM show it to be outside the range of the resistance of a 
conforming part.
The inverter compressor was stopped/started more than 10 
times and it triggered H31 at a high rate. If alarm code P16 
occurs at times, refer to the alarm code P16.
The wiring (power cord and signal line) between the HIC 
and the outdoor CR board is connected properly.
The connector CN-PRY1 on the CR PC board is connected 
properly (locked).
Tester terminals
-
Resistance value (ohm)
U
1 k to 5 k
V
1 k to 5 k
W
1 k to 5 k
U
1 k to 5 k
V
1 k to 5 k
W
1 k to 5 k
NU
5 k to 10 k
U
100 k to   
V
100 k to   
W
100 k to   
P
100 k to   
P
NU
+
Tester terminals
+
Resistance value (ohm)
P
NU
-
U
100 k to   
100 k to   
V
100 k to   
W
100 k to   
Check the
outdoor
unit CR
PC board
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5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
NU
(for Single-phase outdoor unit HIC PC board)
(for 3-phase outdoor unit HIC PC board)
W
V
U
P
NU
W
V
U
P
(for 3-phase outdoor unit CR PC board)
CN-PRY1
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5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
L04 Duplicated Setting of Outdoor System Address Error
Error Detection Method
Error Diagnosis
It is judged an error when the identical self-address communication on the indoor and outdoor wirings is received over 5 times 
within 3 minutes.
1.
2.
Are other outdoor units using a duplicate setting?
1-1
2-1
2-2
Yes
No
2
When units are networked, first set the system address for each outdoor unit in the order 
1-2-3 and then run auto address setting.
2-1
Run the auto address setting.
2-2
Installation
or setting
related
1 System
address
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