(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 Operation Timer

Condition

E01

E12

< Before the Operation >

High Power

: Off

: Blinking

: Illuminated

Warning

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.

Caution

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.

Prohibit

< 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

Is the voltage of about DC12V

or more given between the terminals

2 and 3 on the outdoor unit terminal strip

(Serial Communication Line) ?

(Fig. 1)

Yes

A

( Continued to the next page A. )

 

 

-

+

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

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. )

34

Page 33 Page 35
Page 34
Image 34
Sanyo XMS0972, XMS1272 Serial Communication Error Identification Procedure, Before the Operation, Off Blinking Illuminated
Page 33 Page 35

XMS1272, XMS0972 specifications

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