Sanyo CH1271, CH0971 service manual Before the Operation, 3-1Condition E01

(3) Serial Communication Error Identification Procedure

If the lamps on the main body show the following conditions after the completion of self-diagnostics, a communication error between the indoor unit and outdoor unit might be considered.

In such a case, identify the breakdown section by using the following procedure.

NOTE Refer to "Method of Self-Diagnostics" for the self-diagnostics procedure.

Lamp

Condition

E01

E12

Quiet

(3)

Timer Operation

(2)(1)

: Off

: Blinking

: Illuminated

< Before the Operation >

WARNING

CAUTION

For terminal strip short circuit work or inter-unit wiring removal, turn off the power to avoid an electric shock.

Release the terminal strip short circuit after the completion of self-diagnostics.

Do not perform the short-circuit work between any other terminals except for specified ones on the specified terminal strip. If such work is performed between the incorrect terminals, the unit might be broken.

< Convenient Tool for Short-Circuit Work ( for example ) >	Cable	Alligator Clip
Alligator Clip

< Check Items before Troubleshooting Serial Communication Start >

After confirming that the following errors do not exist, start the "Troubleshooting Serial Communication" in "Condition: E01 and E12".

1.	Mis -wiring (inter-unit cable, etc.)	6.	Reactor failure (defective insulation, etc.)
2.	AC power failure	7.	High-Pressure Switch failure
3.	Blown fuse	8.	Overload Relay failure
4.	Power Relay failure	9.	Magnetic Coil failure (defective insulation, short-circuit, etc.)
5.	Outdoor Fan Motor failure (defective insulation, etc.)	10. Compressor failure (defective insulation, etc.)

(3-1) Condition: E01

Troubleshooting Serial Communication

	-	+												Outdoor Unit
		V
					Outdoor Unit					1	2		3	4	5	6
1	2		3		4		5	6							Power
						Power				1	2		3
									Indoor Unit
1	2		3									V
Indoor Unit
											-	+
				Fig. 1									Fig. 2

Is the voltage of about DC12V

or more given between the terminalsNo

2 and 3 on the outdoor unit terminal strip

(Serial Communication Line) ?

(Fig. 1)

Yes

A

( Continued to the next page A. )

1.Turn OFF the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF.

2.Disconnect the cable from the terminal 3 on the indoor unit

terminal strip. (Fig. 2)

3.Turn ON the power.

B

( Continued to the next page B. )

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