Troubleshooting - Mitsubishi Electric S Series Manual

S series
B.1.11 TROUBLESHOOTING
1. CAUTIONS ON TROUBLESHOOTING
(1) Before troubleshooting, check the followings:
1Check the power supply voltage.
2Check if the indoor/outdoor connecting wire is correct.
(2) Take care of the followings during servicing.
1 Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn
off the breaker.
2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the
components.
3 When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
2. SELF-CHECK
2-1. Wired remote controller
ERROR CODE
TEMP. ON/OFF
MENU ON/OFF FILTER
BACK MONITOR/SET DAY CHECK
OPERATION
PAR-21MAA CLOCK CLEAR
2-2. Wireless remote controller
ON/OFF
AUTO COOL
HEAT DRY
MODE
Lead wire
ERROR CODE
TEST
ERROR CODE
h
TOO TOO
WARM COOL
FAN SELECT
VANE TIME
RESET
Housing point
Turn on the power.
Press the [CHECK] button twice.
Set address with [TEMP] button if system control is used.
Press the [ON/OFF] button to stop the self-check.
CHECK button
Address
TEMP. button
IC : Indoor unit
OC: Outdoor unit
– – – – : No trouble generated in the past.
Check code
F F F F : No corresponding unit.
Unit No.
Timer ON/OFF button
<To cancel check code>
Display the error code on the self-check result display screen.
The address for self-check will blink when the
button is pressed twice within three seconds.
[Procedure]
Turn ON the power.
While pressing both MODE SELECT button and
TOO COOL button on the remote controller at the same
time, press the RESET button.
Firstly, release the RESET button.
Release the other two buttons after all LCD in
operation display section of the remote controller is
displayed after 3 seconds.
Transmit the signal of remote controller, pressing ON/ OFF
button on the remote controller
(The above procedure allows OPERATION INDICATOR lamp
to indicate the failure-mode.)
Transmit the signal of remote controller, pressing ON/ OFF
button to stop the self-check.
OPERATION INDICATOR
CEILING CASSETTE
ON/OFF
B-23