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.)
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.
4-3
Prevent air short
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.
4-6
Prevent air short
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
5-4
Yes
No
Tends to operate for a long time turning gas back into liquid.
5-4
Check the operation
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. )
5-6
Replace the
compressor
See what happens.
Yes
No
Tends to have insufficient refrigerant charge in the system.
5-5
Adjust the amount
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.
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.
7-1
Replace HIC board
8-1
Yes
No
The compressor is causing a failure in the insulation.
8-1
Replace the
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
8-2
Replace the
compressor
9-1
Yes
No
There is a history of H31 in the pre-trip counter of the outdoor
EEPROM alarm history.
6-2
Replace the
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
Standard winding resistance
SM830209-00̲Mini̲VRF SYS.indb 46
SM830209-00̲Mini̲VRF SYS.indb 46
2012/01/11 18:25:39
2012/01/11 18:25:39
