User Manual

TROUBLESHOOTING
14-15
14.4.1.2 MONOZONE / MULTIZONE / MONO SPLIT
No
Check the indoor/outdoor
unit connection cable, and
conduct any defective
section (wrong
connection, incomplete
insertion)
Yes
Check the outdoor unit
power circuit, and repair
any defective part.
No
Check according to the
proper method for
checking the power circuit
Is the control voltage being
generated normally?
12V line: 12V or 7V
5V line: 5V
Yes
Check the wireless light
receiving unit.
Do the deflectors perform initial
operation when the power
supply is turned ON after OFF?
Yes
No
No
Replace the
microcomputer and
oscillator.
Is the microcomputer clock
signal 10Mhz at pins ⑩ and ⑪
being generated normally?
No
Check the reset circuit and
repair any defective part.
Is the microcomputer reset
input pinn⑦ “Hi”?
Yes
Replace the control PWB
No
Check the AC outlet and
breaker, and repair any
defective part.
No
Is DC35V or 20V being
generated between terminals C
and D on the indoor unit
terminal board?
Is AC220~240V being
generated between
terminals A and B on the
outdoor unit terminal
board
Is DC35V being generated
between terminals C and D
on the outdoor unit
terminal board?
Yes
Yes
Connect the cables
correctly
Are C and D connection
cables reversed?
No
Perform final operation check
Yes
Yes
※1: When not in operation, the unit will enter into a low power standby state, possibly causing a voltage
drop to the 12V and 35V lines as shown
25V~20V
12V~7V