219
Failure code
Outdoor
digital display
tube:
123-1, 2
Indoor wired
controller: 78,
7B
Indoor unit LED status
LED5
Failure description:
Hardware instantaneous over current of the
compressor module rectifier side
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 the module is normal,
there is short circuit between P,
N, U, V, W
◆
Check whether the module
is fixed reliably and radiating is
good;
◆
Check the compressor
resistance is normal,
◆
Check if the wiring of
compressor UVW is correct,
frequency converter board and
module board connection is
reliable.
3. Abnormity confirmation
conditions
Hardware instantaneous over
current of the module rectifier
side
4. Possible causes
◆
Poor radiating caused the
module burned;
◆
The module is punctured to
cause a breakdown;
◆
Compressor winding
resistance too large
◆
UVW wiring short circuit, or
compressor line short circuit to
ground
◆
The compressor has a liquid
shock, causing starting current
or operating current too high
Check if the supply voltage is normal
Check if the electrical box connect
correctly, compressor wires connect
reliably
Check if the inverter module is normal
If the resistance, insulation of the
compressor is normal
Solve the failure
Reconnect or re-fix it in
accordance with circuit
diagram.
Replace the inverter module
Replace the compressor
Adjust the power supply.
Y
Y
Y
Y
N
N
N
N
If there are other failures 112,114
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 ...