Sanyo XS1852, C1852, CL1852 service manual Service Procedures

11. SERVICE PROCEDURES

(1) Troubleshooting

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 other tests, and so should be corrected first.

1Check power supply wiring

(a)Single-phase

❑Check that power supply wires are correctly connected to terminal No. 1 through No. 4 on the 4P terminal plate in the indoor unit and No. 5 and No. 6 on the 6P terminal in the outdoor unit.

2Check inter-unit wiring

❑Check that inter-unit control wiring (AC 230 - 208 V Line voltage) is cor- rectly connected between the indoor unit and outdoor unit.

Single-phase outdoor unit

INDOOR
INDOOR UNIT	14 AWG	OUTDOOR UNIT
	(Inter-unit)
	Power lines	B
	230/208 V
1		1
	230/208 V		Fuse
2		2
	230/208 V
3		3
Disconnect		4	L1	A
switch		5
(Field supply)		6	L2
G	Grounding	G
	line

14 AWG

Single-phase, 230/208 V

Power supply line

1306_M_I

Fig. 12

3Check 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.

4Check 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.

5Reference

•Condition of general cooling operation (Thermo. ON) SWEEP .................. ON

Indoor fan speed .... HIGH

SM830079

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