Mitsubishi Electric EHPT20Q-VM2EA Service Manual page 18

9-4. Service Menu
The service menu provides functions for use by installer or service engineer. It is NOT intended the home owner alters settings within this menu. It is for this reason
password protection is required to prevent unauthorised access to the service settings.
The factory default password is "0000".
Follow the procedure described in General Operation for the set up operation.
The service menu is navigated using the F1 and F2 buttons to scroll
through the functions. The menu is split across several screens and is
comprised of the following functions;
1. Manual operation
2. Function settings
3. Thermistor adjustment
4. Auxiliary settings
5. Heat source setting
6. Pump speed
7. Operation settings
8. Energy monitor settings
9. External input settings
10. Running information
11. Thermistor reading
12. Summary of settings
13. Error history
14. Password protection
15. Manual reset
16. SD card
Many functions can not be set whilst the indoor unit is running. The installer should turn off the unit before trying to set these functions. If the installer attempts to
change the settings whilst the unit is running the main remote controller will display a reminder message prompting the installer to stop operation before continu-
ing. By selecting "Yes" the unit will cease operation.
<Manual operation>
During the filling of the system the water circulation pump and 3-way valve can be manually overridden
using manual operation mode.
When manual operation is selected a small timer icon appears in the screen. The function selected will
only remain in manual operation for a maximum of 2 hours. This is to prevent accidental permanent
override of the FTC.
Pressing F3 /D button will switch manual operation mode ON for the main 3-way valve. When filling of
the thermal store tank is complete the installer should access this menu again and press F3 /D to
deactivate manual operation of the part. Alternatively after 2 hours manual operation mode will no
longer be active and FTC will resume control of the part.
Manual operation and heat source setting can not be selected if the system
is running. A screen will be displayed asking the installer to stop the system
before these modes can be activated.
The system automatically stops 2 hours after the last operation.
<Function settings>
Function Setting allows the setting of auto recovery after power failure only.
1. From the service menu use F1 and F2 to highlight Function Setting.
2. Press CONFIRM.
3. Ensure the Ref address and unit number are displayed to the right.
4. Press CONFIRM.
5. Use F3 and F4 to highlight either 1/2/3 (see below).
Note: Changes can ONLY be made to Mode 1.
6. Press CONFIRM.
Mode 1 Setting number meanings
1 - Power failure automatic recovery NOT available
2 - Power failure automatic recovery AVAILABLE
(Approx 4-minute delay after power is restored.)
3 - NO FUNCTION
GCH15010
Selected
Manual operation menu screen
18
Running Error
indication