Panasonic U-4LE1E5 Service Manual page 134

3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes
4 Check the
4-1
situation
4-2
4-3
4-4
4-5
4-6
5 Check
5-1
operation
5-2
5-3
5-4
5-5
5
5-6
6 Check
6-1
history
6-2
7 Check the
7-1
HIC boards
8 Check the
compressor
8-1
8-2
Outdoor air intake temperature is high.
May be caused by poor outdoor unit air flow
(dirty or clogged heat exchanger, blocked discharge port, etc.)
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.
Indoor air intake temperature is high.
The filter of the indoor unit is clogged.
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.
Possible to operate.
Operating pressure is affected by pressure overload.
Tends to have an overcharge of refrigerant in the system.
Tends to operate for a long time turning gas back into liquid.
Tends to have insufficient refrigerant charge in the system.
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. )
Dividing the outdoor EEPROM INV operation time by the number
of times oil was supplied to the system yields 3 hours or less.
There is a history of H31 in the pre-trip counter of the outdoor
EEPROM alarm history.
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.
The compressor is causing a failure in the insulation.
The winding resistance of the compressor is abnormal.
Standard winding resistance
Single-phase model
R-S : 0.490 ohm
R-T : 0.495 ohm
S-T : 0.483 ohm
3-phase model
R-S : 0.903 ohm
R-T : 0.918 ohm
S-T : 0.892 ohm
5 - 46
Mini VRF SYSTEM
Mini VRF SYSTEM
Trouble Diagnosis
Trouble Diagnosis
Yes Take measures
No 4-2
Yes Correct
No 4-3
Prevent air short
Yes
circuit
No 4-4
Yes Take measures
No 4-5
Yes Clean the filter
No 4-6
Prevent air short
Yes
circuit
No 5-1
Yes 5-2
No 6-1
Yes 5-3
No 5-4
Adjust the amount
Yes
of refrigerant
No 5-4
Check the operation
Yes
of functional parts
No 5-5
Adjust the amount
Yes
of refrigerant
No 5-6
Replace the
Yes
compressor
No See what happens.
Yes 6-2
No 6-2
Replace the
compressor and add
Yes oil. However if 6-1
was "no," it is not
necessary to add oil.
No 7-1
Yes Replace HIC board
No 8-1
Replace the
Yes
compressor
No 8-2
Replace the
Yes
compressor
No 9-1