Troubleshooting - Sanyo SAP-KCRV243GJH Technical & Service Manual

13. TROUBLESHOOTING

Precautions before performing inspection or repair
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 280V) 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 inspecition or repair is completed, be sure to move the operation switch to the DEMO position, turn the power
ON, and erase the diagnostics contents.
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.
NOTE
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 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.
PROCEDURE
*
Turn the power switch ON.
*
Move the operation selcetor on the main unit to OFF (self-diagnostics).
*
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.
*
Diagnostics is completed when the buzzer sounds 3 beeps.
*
After inspection or repair is completed, be sure to move the operation selector to the DEMO position, turn the power
ON, and erase the diagnostics contents. Then move the selector to the OFF position and check that the diagnostics
contents have been erased before using the unit.
70
DEMO
TEST
ON
OFF
Operation selector
Ordinarily, this switch should
be in the ON position.
The OFF, TEST, and DEMO
positions are used for
inspection.