Troubleshooting; Precautions Before Performing Inspection Or Repair; Method Of Self-Diagnostics - Sanyo SAP-KRV94EHDX Technical & Service Manual

10. TROUBLESHOOTING

10-1. 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 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.
After repairs are carried out, be sure to press and hold the TEST RUN button until the buzzer sounds 2 times to erase the
diagnosis results.

10-2. Method of Self-Diagnostics

If the indoor unit operation lamp is blinking every 0.5 seconds, follow the
procedure below to perform detailed trouble diagnostics.
NOTE
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 ROM socket
insertion problem, or the ROM has not been installed. Make sure the ROM is in existence.
2. The failure mode is stored in memory even when the power is not ON. Follow the procedure
below to perform diagnostics.
PROCEDURE
1. Turn the power supply switch ON. However, the A/C itself should remain stopped.
2. Press and hold the TEST RUN button on the main unit controller until the buzzer sounds 1 time.
At this time, releasing the TEST RUN button starts 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 blinking (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 times.
< IMPORTANT> After repairs are carried out, be sure to press and hold the TEST RUN button until the buzzer
sounds 2 times. When the TEST RUN button is released, the buzzer sounds 1 long beep, and
the diagnosis results are erased.
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Main unit controller
ON/OFF operation button
TEST
RUN
button