Mitsubishi Electric PKFY-WL04NLMU-E.TH Technical & Service Manual page 40

11-3. SERVICE MENU
Maintenance password is required
1. Select "Service" from the Main menu, and press the [SELECT/HOLD] button.
*At the main display, the menu button and select "Service" to make the
maintenance setting.
2. When the Service menu is selected, a window will appear asking for the pass-
word.
To enter the current maintenance password (4 numerical digits), move the cur-
sor to the digit you want to change with the F1 or F2 button.
Set each number (0 through 9) with the F3 or F4 button.
Then, press the [SELECT/HOLD] button.
Note: The initial maintenance password is "9999". Change the default
password as necessary to prevent unauthorized access. Have the
password available for those who need it.
: If you forget your maintenance password, you can initialize the
password to the default password "9999" by pressing and holding
the F1 button for 10 seconds on the maintenance password set-
ting screen.
3. If the password matches, the Service menu will appear.
The type of menu that appears depends on the connected indoor
units' type.
Note: Air conditioning units may need to be stopped to make only
at "Settings". There may be some settings that cannot be
made when the system is centrally controlled.
A screen will appear that indicates the setting has been saved.
Navigating through the screens
• To go back to the Service menu .............. [MENU] button
• To return to the previous screen ............... [RETURN] button
TCH122
40
Main Main menu
Service
Service menu
Enter maintenance password
Select: SELECT
Cursor
F1 F2 F3 F4
F1 F2 F3 F4
ON
SELECT
MENU
RETURN
OFF
HOLD
S e v r c i e m e n u
Test run
Input maintenance info.
Settings
Check
Others
M a n i m e n u : RETURN
C u s r r o
Service menu
Not available.
Please stop the unit.
Service menu: RETURN