Mini VRF SYSTEM
Trouble Diagnosis
3
3-6
3. Mini VRF System Alarm Codes
Checks Prior to Auto Address Setting
If an outdoor unit displays an alarm, conduct this process after diagnosing the problem.
2
3
2-2
Connect the wiring
Has the wiring of the indoor/outdoor control line been completed?
Is it all connected?
Is the power of the indoor unit(s) and outdoor unit(s) on?
1-1
2-1
Run the auto address setting.
3-6
When units are networked, first set the system address for each outdoor unit in the order
1-2-3 and then run auto address setting.
3-5
Has high voltage (over AC200V) been applied to the control line
circuit? Has the fuse on the control PC board blown?
(Check each board of the indoor unit(s) and outdoor unit(s).)
2-2
Check the setting of the number of indoor units on the outdoor control
PC board. Is the setting the same as the number of indoor units that
are actually connected?
3-1
3-3
3-6
Is the indoor/outdoor control line connected to more than one
outdoor unit? (Network wired?)
3-2
3-4
Correct the setting
Is the Terminal resistor select switch on the outdoor control PC board
set to just one unit?
3-3
3-5
2-1
Power on
2-3
3-1
3-2
Correct the setting
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No 3-6
Are other outdoor units using a duplicate setting?
3-4
The power line and indoor/outdoor control line are miswired. Turn off the power, check &
correct the miswiring and then make connections of the indoor/outdoor control lines to the
emergency side of all the control PC boards and controllers.
2-3
Installation
or setting
related
Indoor/
outdoor
control line
1 Auto
Address
SM830209-00̲Mini̲VRF SYS.indb 6
SM830209-00̲Mini̲VRF SYS.indb 6
2012/01/11 18:24:30
2012/01/11 18:24:30
