Sanyo 24KHS72 Service Manual - Page 46

< Check Items before Troubleshooting Serial Communication Start &gt

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(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 Quiet Condition (3) E01 E12 Timer (2) Operation (1) : Off : Blinking : Illuminated < Before the Operation > 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. < Convenient Tool for Short-Circuit Work ( for example ) > Alligator Clip Cable 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.) 2. AC power failure 3. Blown fuse 4. Power Relay failure 5. Outdoor Fan Motor failure (defective insulation, etc.) 6. Reactor failure (defective insulation, etc.) 7. High-Pressure Switch failure 8. Overload Relay failure 9. Magnetic Coil failure (defective insulation, short-circuit, 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) -+ V Outdoor Unit 1 23 45 6 Power 123 Indoor Unit Fig. 1 Outdoor Unit 1 23456 123 Power Indoor Unit V -+ Fig. 2 1. Turn OFF the power and wait until the power lamp (LED) No 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. Yes A ( Continued to the next page A. ) B ( Continued to the next page B. ) 46

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(3) Serial Communication Error Identification Procedure
Refer to "Method of Self-Diagnostics" for the self-diagnostics procedure.
(3-1) Condition: E01
< Before the Operation >
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.
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)
No
Yes
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.
< Convenient Tool for Short-Circuit Work ( for example ) >
Alligator Clip
Alligator Clip
Cable
A
( Continued to the next page A. )
B
( Continued to the next page B. )
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.
Fig. 1
Outdoor Unit
Power
1
2
4
3
5
6
1
2
3
V
+
-
Indoor Unit
Outdoor Unit
1
2
4
3
5
6
1
2
3
V
+
-
Power
Indoor Unit
Fig. 2
NOTE
Lamp
Quiet
Timer
Operation
: Off
: Blinking
Condition
(3)
(2)
(1)
: Illuminated
E01
E12
CAUTION
WARNING
< 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.)
2.
AC power failure
3.
Blown fuse
4.
Power Relay failure
5.
Outdoor Fan Motor failure (defective insulation, etc.)
6.
Reactor failure (defective insulation, etc.)
7.
High-Pressure Switch failure
8.
Overload Relay failure
9.
Magnetic Coil failure (defective insulation, short-circuit, etc.)
10. Compressor failure (defective insulation, etc.)
46