Mini VRF SYSTEM
Trouble Diagnosis
3
3-16
3. Mini VRF System Alarm Codes
E07 Error in Outdoor Unit Transmitting Signal to the Indoor Unit
Error Detection Method
Error Diagnosis
It is judged an error when a unit itself cannot receive (discrepancy) a signal within a 3-minute period that it had sent.
Outdoor main PC board error
The setting of the terminal resistor select switch on the outdoor main PC board is set incorrectly.
•
•
For information on the procedures for replacing the outdoor main PC board, refer to the manual that is packaged with the
service board.
•
1.
2.
Is the terminal resistor select switch on the outdoor main PC board
set to OPEN?
Is the indoor/outdoor operation line opened or shorted?
1-3
1-4
Replace the outdoor unit main PC board.
1-5
Is the indoor/outdoor operation line connected to more than one
outdoor unit? (Network wired?)
1-1
Is the SHORT on the terminal resistor switch on the outdoor main
PC board set to one unit, and the others are OPEN?
1-2
Make the SHORT
setting
1-4
Yes
No
1-2
1-3
Yes
No
1-4
Set the SHORT to
one unit only
Yes
No
1 Outdoor
unit
control
PC board
Correct the wiring
1-5
Yes
No
(for single-phase outdoor unit PC board)
(for 3-phase outdoor unit PC board)
TERMINAL
TERMINAL
SM830209-00̲Mini̲VRF SYS.indb 16
SM830209-00̲Mini̲VRF SYS.indb 16
2012/01/11 18:24:54
2012/01/11 18:24:54
