Mitsubishi Electric PCH-2GKHA Service Manual page 50

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.
(1) ON the set temperature display part, "CHECK" appears, and the unit
address and the check code are diplayed alternately at one-second
intervals. (Check mode)
Example
CHECK
°C
Unit address
(2) When one remote controller controls several units in the group
control, the LCD shows the unit address and check code of the first
malfunctioning unit.
(3) To cancel the check mode, press the ON/OFF button. In remote
ON/OFF control, press the remote ON/OFF switch. In centralized
control, turn OFF the ON/OFF button of centralized controller.
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.
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
(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 TEMP. or
Each time TEMP. button is pressed, the unit address advances by one. Each time
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.)
50
Altenately
displayed
CHECK
°C
Check code
CHECK. button on the remote controller twice starts the self diagnostic function.
TEMP. button on the remote controller to advance or go back to the unit address.
CHECK mode
4
TEMP. button is
FILTER
CHECK MODE
TEST RUN