Panasonic U-4LE1E5 Service Manual page 122

4. Mini VRF System Alarm Codes
3. Mini VRF System Alarm Codes
H31 HIC Error
1. Error Detection Method
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.
• HIC overcurrent due to HIC fault
• HIC abnormal heat caused by defective HIC or HIC radiation error
• Signal line is not connected properly or opened between the HIC and the
2. Error Diagnosis
1 Wiring
1-1
between
HIC &
outdoor
1-2
control
PC board
2 Check the
outdoor
2-1
unit CR
PC board
3 HIC poor
radiation
3-1
3-2
4 HIC
overcurrent
4-1
5
5
4-2
HIC board IPM Pass/Fail Tests
• 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)
Tester terminals
+
-
Resistance value (ohm)
Tester terminals
-
+
Resistance value (ohm)
• Excepting the parts of "
value is "0 = short-circuit".
The wiring (power cord and signal line) between the HIC
and the outdoor CR board is connected properly.
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 connector CN-PRY1 on the CR PC board is connected
properly (locked).
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.
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.
U V
1 k to 5 k 1 k to 5 k
U V
100 k to 100 k to
100 k to ", it is acceptable if a small resistance value appears as a reference value unless the
outdoor CR
P
W NU
1 k to 5 k 5 k to 10 k 100 k to
P
W
100 k to 1 k to 5 k
5 - 36
5 - 34
Mini VRF SYSTEM
Mini VRF SYSTEM
Trouble Diagnosis
Trouble Diagnosis
board.
Yes 1-2
No Correct wiring (connector)
3-1 : Single-phase model
Yes
2-1 : 3-phase model
No Replace wiring
Yes 3-1
No Correct wiring (connector)
Yes 3-2
Tighten screw(s),
No
add putty
Yes 4-1
No Remove foreign matter
Yes Replace the HIC PC board
No 4-2
Replace the HIC PC board
Yes
No Refer to alarm code P16
NU
U V W
100 k to 100 k to
NU
U V W
1 k to 5 k 1 k to 5 k
P
100 k to