10. TROUBLESHOOTING
■ Precautions before performing inspection or repair
NOTE
Executing self-diagnostics
● After checking the self-diagnostics monitor, turn the power OFF before starting inspection or repair.
● High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge
(charging voltage DC 310 V) even after the power is turned OFF, and some time is required for the charge to dissipate. Be
careful not to touch any electrified parts before the controller LED (red) turns OFF.
If the outdoor controller is normal, approximately 30 seconds will be required for the charge to dissipate. However, allow at
least 5 minutes for the charge to dissipate if there is thought to be any trouble with the outdoor controller.
1: If the operation lamp blinks every 0.5 seconds immediately when the power
is turned ON, there is an external ROM (OTP data) failure on the indoor
circuit board, or a ROM socket insertion problem, or the ROM has not been
installed.
2: The failure mode is stored in memory even when the power is not ON.
Follow the procedure below to perform diagnostics.
■ Method of self-diagnostics
Follow the procedure below to perform detailed trouble diagnostics.
ON
E
I/OFF
E
1HR.
UIET
MODE
TEMP.
TIMER
CANCEL
SENSOR
ADR ACL
24H12HF
CLOCK
NIGHT SETBACKFAN SPEED
HIGH POWER
FLAP
AIR CONDITIONER
1HR.
TIMER
button
ON/OFF
operation
button
ACL
(Reset)
button
QUIET
button
< Clock display >
Test run mode
Self-diagnostics mode
Step 1: Press and hold the remote controller QUIET button and 1 HR TIMER
button. At the same time, press the ACL (reset) button. Use a pointed
object such as the tip of a pen to press the ACL button.
When this has been done, “oP-1” (test run) appears, blinking, in the
remote controller clock display area.
Step 2: Next, press the 1 HR TIMER button once to change the display from
“oP-1” to “oP-3” (self-diagnostics). (The display continues to blink.)
Step 3: Finally press the ON/OFF button to engage self-diagnostics mode.
• The self-diagnostics function utilizes the 3 indicator lamps on the main unit, in
combinations of ON lamps, blinking lamps, and OFF lamps, to report the
existence of sensor trouble or a protective operation. (The lamps blink or
remain ON for 5 seconds, then turn OFF for 2 seconds.) Self-diagnostics is
completed when the buzzer sounds 3 short beeps.
• A maximum of 3 self-diagnostics reports are displayed, for 5 seconds each,
beginning with the most recent report. Following this display the lamps turn
OFF. In order to view the self-diagnostics results again, press the ON/OFF
button again.
• The 3 lamps remain OFF if no trouble has occurred.
<IMPORTANT> After self-diagnostics is completed, be sure to press the ACL
(reset) button to return to normal mode. The air conditioner will
not operate if this is not done.
After turning on power to the air conditioner, use the remote controller and
follow the steps below to execute self-diagnostics.
