178
Failure code
Outdoor
digital display
tube: 24-0, 1, 2
Indoor wired
controller:
18
Indoor unit LED status
LED5
Failure description:
Oil temperature sensor:
Th, Toil1 and Toil2 failure
20 times
Outdoor unit LED status
LED1
LED2
Normal
Normal
1. Model
Failure diagnosis and troubleshooting
MRV 5-RC series
Diagnosis
Troubleshooting
2. Abnormity detection method
◆
Check if the sensor
connection is normal;
◆
Check if resistance
characteristic of the sensor is
normal;
◆
Check if the temperature
loop acquired by the PCB is
normal.
3. Abnormity confirmation
conditions
It is detected that the AD value
is below 11 (open circuit) or
above 1012 (short circuit) for
60 seconds continuously, when
Ta≤-10°C, no alarm is given;
when ET≤-10°C, no alarm is
given within 5 minutes.
4. Possible causes
◆
The connection of sensor is
not secure;
◆
The sensor is broken;
◆
The oil temperature sensor
is with resistance drift;
◆
The temperature acquired
by PCB is not accurate.
Replace it correctly by after-
sales personnel on site.
Check if the corresponding
connector of sensor is normal
C h e c k i f r e s i s t a n c e
characteristic of the sensor
is normal
Check if the temperature
l o o p a c q u i r e d b y t h e
computer board is normal
Replace it correctly by after-
sales personnel on site.
Replace it correctly by after-
sales personnel on site.
N
N
Y
Y
Y
Summary of Contents for MRV 5-RC AB052MAERA
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 ...