Carrier X-POWER Series - Page 154

R410A DC Inverter Series Carrier service manual
172 Troubleshooting
4.8 H2/H3
H2: Quantity of outdoor units decrease error (Only display on master unit, all the ODU in standby)
H3: Quantity of outdoor units increase error (Only display on master unit, all the ODU in standby)
Note: All the outdoor units should be unified power supply. If the outdoor units are note be unified power
supply, once some outdoor unit is power off, other outdoor units are still running, it may cause system
unbalance and damage devices.
H
2/H3
Communication wire between
outdoor units is loose
Fasten the signal 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
PCB, if LED1 is on, the PCB is
power on, if LED1 is off, the PCB is
power off
Turn on all the outdoor units
No
No
No
Yes
Yes
Yes
Outdoor main control
board is damaged
Replace the outdoor
main control board