Sanyo CH2472 Serial Communication Error Identification Procedure, Off Blinking Illuminated

(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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