3. Mini VRF System Alarm Codes
9 Check the
Replace the HIC PC board and operate the unit. (Apply putty and
HIC PC
9-1
screws must not be loose) Does it operate normally?
boards
10 Check the
outdoor
10-1
Replace the control PC board and operate the unit.
unit main
PC board
•
(Check content of 7) The test check of the HIC board is only a check on the output level, so the input stage may not be working.
•
With the filter board broken, alarm P16 may not be triggered.
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".
Single-phase outdoor unit HIC board
NU
W
V
P
U
V
1 k to 5 k
1 k to 5 k
1 k to 5 k
P
U
V
100 k to
100 k to
100 k to
100 k to
", it is acceptable if a small resistance value appears as a reference value unless the
U P
W
NU
U
5 k to 10 k
100 k to
W
U
1 k to 5 k
3-phase outdoor unit HIC board
NU
W
3-47
Mini VRF SYSTEM
Trouble Diagnosis
Yes
See what happens.
No
10-1
See what happens.
NU
V
W
100 k to
100 k to
100 k to
NU
V
W
1 k to 5 k
1 k to 5 k
V
U P
P
3