Lennox VEP034N432US User Manual page 31

DC Inverter Multi VRF System
—— Debugging code
Progress
Code
db
db
03_ Confirm the
quantity of ODU
db
db
04_ Confirm the
quantity of IDU
db
db
05_ Detect
ODU's internal
db
communication
and capacity
ratio
db
db
06_ Detect
outdoor db
components
Description of each stage of debugging progress
Progress code
LED1 LED2
Display
Code
status
On 02
On 03
On 03
On 04
On 04
On 05
On 05
On 05
On 05
On 06
Status code
LED3
Display Display
Code
status status
On OC On
On 01 Blink
On OC On
On 01~80 Blink
On OC On
On C2 On
On OC On
On CH On
On CL On
error
On On
code
27
Code meaning and operation
method
Allocation is finished. 2s later, next
step starts.
System is confirming. 1s later, next
step starts.
System finishes confirmation. 2s
later, next step starts.
LED3 displays the quantity of indoor
unit. Confirm the number manually.
If the number is not consistent the
display one, cut off power of IDU
and ODU and check whether
communication wire of IDU is
correctly connected. After the check,
connect power and start debugging
from progress 01. If the number is
then correct, press main board's
SW7 button to confirm. Then the
display is as below.
System has confirmed the quantity.
2s later, next step starts.
Communication between master
ODU and driver has error. Check the
communication connection of ODU's
main board and drive board. When
the error is eliminated, start next
step. If power is off during
troubleshooting, then restart
debugging from progress 01 after
power is on.
Communication of master ODU and
driver is normal. Unit will display as
in the left for 2s and detect the
capacity ratio of IDU and ODU. If the
ratio is within range, than next step
will start 2s later. If the ratio is out of
range, unit will display as below.
Rated capacity ratio of IDU is too
high. Change the combination way
of IDU and ODU to make the ratio
within range. And restart debugging
from progress 01.
Rated capacity ratio of IDU is too
low. Change the combination way of
IDU and ODU to make the ratio
within range. And restart debugging
from progress 01.
Outdoor component's error. LED3
will display the related error code.
After errors are eliminated, system
will start next step automatically. If
power is off during troubleshooting,
then restart debugging from
progress 01 after power is on.