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Mini VRF SYSTEM
Trouble Diagnosis
3
3-45
3. Mini VRF System Alarm Codes
P16 Overcurrent of Inverter Compressor
Check of content
2.
Meaning of Alarm
1.
Secondary current effective value detected the overcurrent (trip current value).
Single-phase model : Trip current = 24.0 A
Single-phase model : Trip current = 24.0 A
Single-phase model : xx A = 45.0 A
3-phase model : Trip current = 18.0 A
3-phase model : xx A = 36.0 A
Secondary current instantly detected over xx A.
•
•
0-1
-
Yes
No
0 Multiple
factors
7-1
0-2
1 Power
Source
2 Board
wiring
3
Compressor
wiring
wiring
1-1
Correct the wiring
1-2
Yes
No
Power cord connections are loose.
Replaced the board, but it occurred again immediately.
-
Yes
No
Replace compressor
along with adding oil,
then recheck from 1-1
along with adding oil,
then recheck from 1-1
1-2
Test the power supply
1-3
Yes
No
Test the power supply
1-4
Yes
No
1-3
Extreme fluctuations in voltage.
Test the power supply
2-1
Yes
No
1-4
An open phase state is observed.
Replaced the compressor (added oil, if it was necessary)
but it occurred again immediately.
but it occurred again immediately.
Rated power voltage is not within ±10%.
2-1
Correct
2-2
Yes
No
Disconnected parts, miswiring and/or poor connections (loose)
are observed in the connections on the CR board and/or in the
connections of components that are connected by wiring from
the CR board.
are observed in the connections on the CR board and/or in the
connections of components that are connected by wiring from
the CR board.
2-2
Correct
2-3
Yes
No
Correct
2-4
Yes
No
2-3
Disconnected parts, miswiring and/or poor connections (loose)
are observed in the connections of outdoor board(s) that are
connected by wiring from the HIC board.
are observed in the connections of outdoor board(s) that are
connected by wiring from the HIC board.
Correct
2-5
Yes
No
2-4
Disconnected parts, miswiring and/or poor connections (loose)
are observed in the connections of HIC boards connected by
wiring from the CR board.
are observed in the connections of HIC boards connected by
wiring from the CR board.
Correct
2-6
Yes
No
2-5
Disconnected parts, miswiring and/or poor connections (loose)
are observed in the connections of HIC board(s) that are
connected by wiring from the outdoor board.
are observed in the connections of HIC board(s) that are
connected by wiring from the outdoor board.
Correct
3-1
Yes
No
2-6
Disconnected parts, miswiring and/or poor connections (loose)
are observed in the connections of HIC board(s) that are
connected by wiring to a compressor.
are observed in the connections of HIC board(s) that are
connected by wiring to a compressor.
Disconnected parts, miswiring and/or poor connections (loose)
are observed in the connections of outdoor board(s) that are
connected by wiring from the CR board.
are observed in the connections of outdoor board(s) that are
connected by wiring from the CR board.
3-1
Correct
3-2
Yes
No
Disconnections and/or miswiring are observed in the
connecting location of the compressor terminals.
connecting location of the compressor terminals.
3-2
Eliminate looseness by
changing the terminals,
or crimping the
terminals again.
changing the terminals,
or crimping the
terminals again.
4-1
Yes
No
Conditions such as burned terminal covers and/or discolored
terminals are observed in the connecting location of the
compressor terminals.
terminals are observed in the connecting location of the
compressor terminals.
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Mini VRF SYSTEM
Trouble Diagnosis
3
3-46
3. Mini VRF System Alarm Codes
Outdoor air intake temperature is high.
4-1
Take measures
4-2
Yes
No
May be caused by poor outdoor unit air flow
(dirty or clogged heat exchanger, blocked discharge port, etc.)
(dirty or clogged heat exchanger, blocked discharge port, etc.)
4-2
Correct
4-3
Yes
No
Air short circuit has occurred. This is a phenomenon when
discharged air (exhaust heat) from the outdoor unit is drawn back
into the suction vent.
discharged air (exhaust heat) from the outdoor unit is drawn back
into the suction vent.
4-3
Prevent air short
circuit
4-4
circuit
4-4
Yes
No
Indoor air intake temperature is high.
4-4
Take measures
4-5
Yes
No
Air short circuit has occurred. This is a phenomenon when
discharged air (exhaust heat) from the indoor unit is drawn back
into the suction vent.
discharged air (exhaust heat) from the indoor unit is drawn back
into the suction vent.
4-6
Prevent air short
circuit
5-1
circuit
5-1
Yes
No
The filter of the indoor unit is clogged.
4-5
Clean the filter
4-6
Yes
No
Possible to operate.
5-1
5-2
6-1
Yes
No
Operating pressure is affected by pressure overload.
5-2
5-3
5-4
Yes
No
Tends to have an overcharge of refrigerant in the system.
5-3
Adjust the amount
of refrigerant
of refrigerant
5-4
Yes
No
Tends to operate for a long time turning gas back into liquid.
5-4
Check the operation
of functional parts
of functional parts
5-5
Yes
No
Even though the high pressure saturation temperature is 43°C or
less, the secondary current of the inverter is high.
(The frequency (Hz) ends up dropping due to the current. )
less, the secondary current of the inverter is high.
(The frequency (Hz) ends up dropping due to the current. )
5-6
Replace the
compressor
compressor
See what happens.
Yes
No
Tends to have insufficient refrigerant charge in the system.
5-5
Adjust the amount
of refrigerant
of refrigerant
5-6
Yes
No
4 Check the
situation
5 Check
operation
Dividing the outdoor EEPROM INV operation time by the number
of times oil was supplied to the system yields 3 hours or less.
of times oil was supplied to the system yields 3 hours or less.
6-1
6-2
6-2
Yes
No
The results of HIC board IPM Pass/Fail Tests show the outside the
range of the resistance of a conforming part listed in the next page.
range of the resistance of a conforming part listed in the next page.
7-1
Replace HIC board
8-1
Yes
No
The compressor is causing a failure in the insulation.
8-1
Replace the
compressor
compressor
8-2
Yes
No
The winding resistance of the compressor is abnormal.
Single-phase model
R-S :
R-T :
S-T :
0.490 ohm
0.495 ohm
0.483 ohm
0.495 ohm
0.483 ohm
8-2
Replace the
compressor
compressor
9-1
Yes
No
There is a history of H31 in the pre-trip counter of the outdoor
EEPROM alarm history.
EEPROM alarm history.
6-2
Replace the
compressor and add
oil. However if 6-1
was "no," it is not
necessary to add oil.
compressor and add
oil. However if 6-1
was "no," it is not
necessary to add oil.
7-1
Yes
No
6 Check
history
7 Check the
HIC boards
8 Check the
compressor
3-phase model
R-S :
R-T :
S-T :
0.903 ohm
0.918 ohm
0.892 ohm
0.918 ohm
0.892 ohm
Standard winding resistance
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Mini VRF SYSTEM
Trouble Diagnosis
3
3-47
3. Mini VRF System Alarm Codes
Replace the HIC PC board and operate the unit. (Apply putty and
screws must not be loose) Does it operate normally?
screws must not be loose) Does it operate normally?
9-1
See what happens.
10-1
Yes
No
Replace the control PC board and operate the unit.
10-1
See what happens.
9 Check the
HIC PC
boards
boards
10 Check the
outdoor
unit main
PC board
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.
•
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”.
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
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
V
W
NU
U P
V
W
NU
U P
Single-phase outdoor unit HIC board
3-phase outdoor unit HIC board
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Mini VRF SYSTEM
Trouble Diagnosis
3
3-48
3. Mini VRF System Alarm Codes
1-1
2-1
Correct the connector
connections
connections
Yes
No
3-1
Replace the outdoor
fan motor
fan motor
Yes
No
1 Wiring
2
Disconnect the connectors “CN-FMA”, “CN-FMB”, “CN-FM1”,
and “CN-FM2” from the outdoor control PC board and rotate
the outdoor fan by hand; does it rotate freely?
(Check the outdoor fan motor lock)
and “CN-FM2” from the outdoor control PC board and rotate
the outdoor fan by hand; does it rotate freely?
(Check the outdoor fan motor lock)
2-1
Outdoor
fan motor
fan motor
P22 Outdoor Fan Motor Error
Error Detection Method
Error Diagnosis
It is judged an error when the outdoor fan motor's rotating signal cannot be detected normally.
•
1.
2.
Are the connectors “CN-FMA”, “CN-FMB”, “CN-FM1”, and
“CN-FM2” firmly connected to the outdoor control PC board
(lock engaged)?
“CN-FM2” firmly connected to the outdoor control PC board
(lock engaged)?
3
Turn the power on and run the unit again; is P22 triggered
again? Or can you see or hear anything that is obviously
wrong in its rotation?
again? Or can you see or hear anything that is obviously
wrong in its rotation?
Replace the outdoor control PC board. (If it fails to operate normally even after replacing
the outdoor control PC board, replace the outdoor fan motor.)
the outdoor control PC board, replace the outdoor fan motor.)
3-1
3-2
3-3 If there is nothing particularly out of the ordinary, see what happens.
Outdoor
control
PC board
control
PC board
3-2
3-3
Yes
No
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