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[7-2 Error Code Definitions and Solutions: Codes [0 - 999] ]
7-2
Error Code Definitions and Solutions: Codes [0 - 999]
7-2-1
Error Code [0403]
1. Error code definition
Serial communication error
2. Error definition and error detection method
Serial communication error between the control board and the INV board on the compressor, and between the control board
and the Fan board
Detail code 1: Between the control board and the INV board
Detail code 5: Between the control board and the Fan board
3. Cause, check method and remedy
(1) Faulty wiring
Check the following wiring connections.
1) Between Control board and Fan board
Control board
CN2,CN2A
CN4,CN4A
2) Between Fan board and INV board
FAN board
CN82
CN83
(2) INV board failure, Fan board failure and Control board failure
Replace the INV board or the Fan board or control board when the power turns on automatically, even if the power source is
reset.
1. Error code definition
Panel communication error (Indoor unit)
2. Error definition and detection method
This error is detected when indoor units cannot successfully receive the signals from the Auto filter cleaning unit for one min-
ute.
3. Cause, check method and remedy
Cause
(1)
Incorrect switch setting on the indoor unit cir-
cuit board
(2)
Power wire that connects the circuit board on
the indoor unit and the circuit board on the
cleaning unit is loose.
(3)
Communication wire that connects the circuit
board on the indoor unit and the circuit board
on the cleaning unit is loose.
(4)
Panel transceiver circuit fault (cleaning unit)
(5)
Panel transceiver circuit fault (indoor unit)
(6)
Electrical interference on the cleaning unit's
communication cable
For inverter-related error codes, refer to the following page(s).
[8-10 Troubleshooting Inverter Problems (TKMU)](page 288)
[8-11 Troubleshooting Inverter Problems (YKMU)](page 298)
HWE13080
FAN board
CN80
CN80
INV board
CN2
CN43
- 179 -
Check method and remedy
Check SW3-3 on the indoor unit circuit board
Set SW3-3 to ON only when connecting an auto filter cleaning
unit.
Check the LED1 (cleaning unit circuit board (microcomputer
power)).
Lit: Power is supplied properly.
Unlit: Check for loose or disconnected power wire between the
indoor unit circuit board (CNAC) and the cleaning unit circuit
board (CN3A).
Check the LED4 (cleaning unit circuit board (communication)).
Blinking: Normal communication
Unlit: Check for loose or disconnected communication wire be-
tween the indoor unit circuit board (CN3G) and the cleaning unit
circuit board (CN3G).
If the LED blinks at irregular intervals (normally blinks at 0.5-sec-
ond intervals), electrical interference is suspected.
Check the items above, turn the power off, and turn the power
back on. If the error persists, replace either the cleaning unit cir-
cuit board or the indoor unit circuit board.
GB
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