Service Procedures; Troubleshooting; Check Before And After Troubleshooting - Sanyo SPW-C483GYH8 Service Manual

1. Troubleshooting

1-1. Check before and after troubleshooting

Many problems may happen because of wiring or power supply problems, so you should check these areas first.
Problems here can cause false results in some of the following tests, and so should be corrected first.
¶ Since the check of interior of outdoor unit is very hazardous, always cut off its power supply at first. Begin
the inspection more than 3 minutes after cutting off the power supply, and after ensuring that the unit has
halted completely and that the LED of outdoor unit's P.C.B. Ass'y has turned OFF.
¶ This is because a condenser of massive capacity is used inside the outdoor unit; and a charging load re-
mains inside it even after the power has been cut off, and it takes about 3 minutes for it to get discharged.
¶ While in usual state, do not disconnect the white connector of outdoor controller which is marked "CN1";
because it may cause malfunctioning.
(1) Check power supply wiring
¶ Check that power supply wires are correctly connected to terminal plate in the outdoor unit.
¶ Check the power supply wires are correctly connected between the terminal plate in the indoor unit and terminal
plate in the outdoor unit.
(2) Check inter-unit wiring
¶ Check that inter-unit control wiring (DC low voltage) is correctly connected between the indoor unit and outdoor
unit.
(3) Check power supply
¶ Check that voltage is within the specified range (±10 % of the rating).
¶ Check that power is being supplied.
If the following troubleshooting must be done with power being supplied, be careful not to touch any
uninsulated live part that can cause ELECTRIC SHOCK.
(4) Check the lead wires and connectors in indoor and outdoor units.
¶ Check that the sheath of lead wires is not damaged.
¶ Check that the lead wires are firmly connected at the terminal plate.
¶ Check that the wiring is correct.
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Service Procedures

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SM830052