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2. SELF DIAGNOSTIC FUNCTION WITH REMOTE CONTROLLER
2-1 When malfunction occurs during operation
When a malfunction occurs, the indoor and outdoor units stop and the malfunction is displayed on the LCD of the remote
controller.
(A) ON the set temperature display part, “CHECK” appears, and
the unit address and the check code are displayed alternately
at one-second intervals. (Check mode)
2-2 How to use the self diagnostic function for service
A. For normal control with one unit and one remote controller
(1) Pressing the CHECK button on the remote controller twice starts the self diagnostic function.
(2) During the self diagnostic function, “CHECK” appears at two positions on the remote controller display. Then, at least
10 seconds later, the unit address and the check code is alternately displayed at one-second intervals.
(3) Check and repair the unit according to the check code. (Refer to the next page.)
2-3 For group control using one remote controller
(1) Press the WARMER or COOLER button on the remote controller to advance or go back to the unit address. Each time
WARMER button is pressed, the unit address advances by one. Each time COOLER button is pressed, the unit
address goes back by one.
The check code and the unit address, appear alternately.
(2) The check code “U8” means no malfunction has occurred since installation.
The check code “EO” means the following conditions:
● The unit address displayed on the remote controller does not apply to any unit.
● power is not supplied to the unit.
● Signal transmitting / receiving circuit is abnormal.
(3) Check and repair the unit according to the check code. (Refer to the next page.)
MITSUBISHI ELECTRIC
-CENTRALLY CONTROLLED-
STAND BY
DEFROST
ON
CHECK DRY
COOL
HEAT
CHECK
SET TEMP
TIMER OFF
AUTO STOP
AUTO START
F
HR
F
LOW HIGH
AUTO RETURN
CHECK TEST RUN
POWER
ON/OFF
HEAT
SET
TEMPERATURE
AUTO COOL/DRY
COOLERWARMER
TIMER MODE HOURS
FAN SPEED LOW/HIOGH
AIR
DISCHARGE
UP/DOWN
SWING
STOP
CHECK TEST RUN
(2) When one remote controller controls several units in the group control,
the LCD shows the unit address and check code of the first malfunc-
tioning unit.
(3) To cancel the check mode, press the POWER button. In
remote ON/OFF control, press the remote ON/OFF switch. In central-
ized control, turn OFF the POWER ON/OFF button of centralized con-
troller.
ON/OFF
NOTE: The latest check code is memorized, even if the check mode is cancelled by the way mentioned above. It takes
60 seconds maximum to display the memorized check code.
CHECK mode
CHECK button
Example
Alternately
displayed
CHECK
0
°F
CHECK
p1
°F
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