MCAC-VTSM-2016-04
R410A DC Inverter VRF V4 Plus W Series 50Hz
Troubleshooting 205
3.5 H0: Communication error between main control chip and inverter driver chip; H1: Communication
error between main control chip and communication chip
3.6 H2: Main unit quantity decreased error; H3: Main unit quantity increased error
Note: All the outdoor units should be unified power supply. If the outdoor units are not unified power supply,
once some outdoor unit is power off, other outdoor units are still running, it may cause system unbalance and
damage devices.
H0/H1
Power supply for main PCB and
transformer is abnormal
The transformer is damaged
Remove the interference
No
No
No
Yes
There has electromagnetic interference
nearby the unit. Such as High-frequency
transmitter or other high strength radiation
device
Replace the transformer
Provide normal power supply
Yes
Yes
H2/H3
Communication wire between
outdoor units is loosen
Fasten the communication wire
Some outdoor units
’ addresses
(ENC1) are setting repeatedly
Set the addresses (ENC1)
differently
Some outdoor units in combination
is power off (check the LED1 on
main PCB, if LED1 is on, the main
PCB is power on, if LED1 is off, the
main PCB is power off)
Turn on all the outdoor units
Outdoor main PCB is
damaged
Replace the outdoor
main PCB
No
No
No
Yes
Yes
Yes
Yes
Outdoor main PCB
is damaged
Replace the outdoor
main PCB