Repair Section
57
LCD
displays
self-
diagnostic
codes.
E13 E18 4 Excessive current from the
power source to the STI
module.
RESET the controller
*1
twice or three
times. If the error still occurs, replace
the compressor.
E19 4 Degraded heat sink
performance.
Replace the relay board.
Then initialize the fan motor.
(See page 59.)
AC fan motor is not working. Reconnect the AC fan motor and check
the connection.
RESET the controller
*1
.
If the AC fan motor still does not work,
replace it.
RESET the controller
*1
.
E20 4 Recovery from momentary
power loss or momentary
voltage drop.
Check if the supplied voltage to the unit
is unstable due to the external influence
or not.
RESET the controller
*1
.
If the error still occurs, replace the relay
board.
Then initialize the fan motor.
(See page 59.)
Momentary power loss, or
momentary voltage drop.
E21 4 Sensor on the relay board is
short or open.
Replace the relay board.
Then initialize the fan motor.
(See page 59.)
E22 4 Compressor actuating circuit on
the relay board is short or open.
Replace the relay board.
Then initialize the fan motor.
(See page 59.)
E23 E23 4 Evaporator fan over rotation
protection is activated.
Check ducting of intake and exhaust air,
and remove any foreign object
preventing air flow.
RESET the controller
*1
.
Condition
Self-Diagnostic
Codes
(WMC)
Buzzer
Pattern
Possible Cause Remedy
Unit does
not operate.
User
Mode
Service
Mode
*1 : To RESET the controller, press RESET button, then press ON/OFF button.
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