5. TROUBLESHOOTING
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Precautions before performing inspection or repair
NOTE
PROCEDURE
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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 280 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.
After inspection or repair is completed, be sure to move the operation switch to the DEMO position, turn the power ON, and
erase the diagnostics contents.
1: If the operation lamp flashes 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 board insertion
problem, or the board 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.
Operation switch
Ordinarily, be sure
this is always set to
NORMAL.
The DEMO position is
used for inspections
and similar
maintenance.
Operation selector
Ordinarily, be sure this is always set to ON.
The OFF and TEST positions are used for
inspections and similar maintenance.
1
Turn the power switch ON.
2
Move the operation selector on the remote control receiver to OFF (self-diagnostics).
3
If there is a sensor failure or a protective function has activated, self-diagnostics lamps 1, 2, and 3 will illuminate in the
following pattern: 5 seconds flashing (illuminated) + 2 seconds OFF. (Buzzer sounds once while lamps are OFF.)
Note: If there is no trouble, then self-diagnostics lamps 1, 2, and 3 do not illuminate, and the buzzer does not sound.
4
Diagnostics is completed when the buzzer sounds 3 beeps.
5
After inspection or repair is completed, be sure to move the operation switch on the indoor unit main body to the DEMO
position, turn the power ON, and erase the diagnostics contents. Then move the operation selector on the remote control
receiver to the OFF position and check that the diagnostics contents have been erased before using the unit.
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Method of self-diagnostics
If the indoor unit operation lamp is flashing every 0.5 seconds, follow the
procedure below to perform detailed trouble diagnostics.
<Indoor unit main body>
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