189
Failure code
Outdoor
digital
display tube:
36-0, 1
Indoor wired
controller:
24
Indoor unit LED status
LED5
Failure description:
Outdoor compressor oil temperature (Toil1,
Toil2) too low failure
20 times
Outdoor unit LED status
LED1
LED2
Normal
Normal
1. Model
Diagnosis and troubleshooting
MRV 5-RC series
Diagnosis
Troubleshooting
2. Abnormity detection method
◆
Check if the temperature
detected by the oil temperature
sensor is correct.
◆
Check if the outdoor unit
SV31, SV32, LEVb, etc.
are with abnormal leakage
and check if the detected
temperature is correct;
◆
Check if the shutdown
indoor unit LEV of unit is closed
tightly, and if the running indoor
unit fan operates normally.
3. Abnormity confirmation
conditions
Toil1/Toil2-CT≤10
°C lasts for
5min.
4. Possible causes
◆
The probe of oil temperature
sensor falls off or is with
unsecure connection;
◆
The probe of oil temperature
sensor is misplaced;
◆
The oil temperature sensor
is with resistance drift;
◆
The outdoor unit LEVb,
SV31 and SV32 are with
leakage;
◆
The terminal of outdoor
unit LEVa1, 2 and LEVb is
connected incorrectly;
◆
For the unit, there is LEV
leakage in shutdown indoor
unit and non-operation of fan in
operating indoor unit;
◆
The system refrigerant is too
much
◆
The operation environment
is beyond the allowed range.
Check if the resistance of oil
temperature sensor is correct.
Check if the sensor probe is secure
and if the position is correct.
Check if the indoor unit LEV of “OFF”
is closed tightly and if the indoor unit
fan of “ON” is normal.
Check if the terminal of
outdoor unit LEVb, SV31
and SV32 is connected
properly or is closed tightly.
Check if the outdoor unit LEVa1, 2
and LEVb are connected properly
and correctly when heating.
Check if the unit is filled with
excessive refrigerant.
Fill with regular refrigerant in
accordance with standard quantity.
Replace the oil temperature
sensor by after-sales personnel
on site.
Replace it correctly by after-sales
personnel on site.
[Note]: Check if it is inserted,
connected and intersected with
another compressor, especially
when a single compressor operates.
Replace the poor valve (with
leakage) and fan correctly by
after-sales personnel on site.
Replace the poor valve (with
leakage) and fan correctly by
after-sales personnel on site.
Replace it correctly by after-sales
personnel on site.
Check if the computer board
can normally control the related
electronic expansion valve and
solenoid valve, if not, replace it.
Y
N
Y
N
N
N
Y
N
N
Y
Y
Y
Summary of Contents for MRV 5-RC VP1-112B
Page 1: ...MRV 5 RC Service Manual SYJS 03 2019REV A Edition 2019 03 ...
Page 3: ......
Page 55: ...52 AV08 10 12 14IMVURA 4 Center of gravity x X 347 9587 y 471 5454 z 725 6683 y z ...
Page 56: ...53 AV16 18 20 22IMVURA x X 650 5962 y 380 7255 z 706 5342 y z ...
Page 106: ...103 2 Dimension 4 19 200 60 25 25 25 249 108 232 84 69 388 73 82 65 103 177 4 44 4 35 277 ...
Page 116: ...113 2 Preparation before installation ...
Page 162: ...159 One by one valve box PCB code 0151800186A 2 Valve box PCB photo and dip switch setting ...
Page 165: ...162 One by four valve box PCB code 0151800466 ...