Panasonic U-4LE1E5, Service Manual, Page: 114 / 133

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
SM830195-01̲Mini VRF SYS.indb 34 SM830195-01̲Mini VRF SYS.indb 34 2011/12/20 16:32:44 2011/12/20 16:32:44