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MIV V5 Heat Recovery DC Inverter R410A
DM14-01.01.18en
Troubleshooting
168
4.9 H2: Quantity of outdoor unit decreased; H3: Quantity of outdoor unit increased
The error only display on master unit, all the ODU will be standby.
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.
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