Service Menu; Manual Operation - Mitsubishi Electric EHST20C-VM6HB Service Manual

9-2. 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.
From the main setting menu use F2 and F3 to highlight the service icon then
1.
press CONFIRM.
You will be prompted to enter a password. THE FACTORY DEFAULT
.
PASSWORD IS "0000".
Press CONFIRM.
.
(It takes approx. 30 secs to load the service menu.)
The service menu is navigated using the F1 and F2 buttons to scroll through the
functions. The menu is split across two screens and is comprised of the following
functions;
1.

Manual operation

Function settings
.
Thermistor adjustment
.
Auxiliary settings
4.
Heat source setting
5.
Operation settings
6.
External input settings
7.
Running information
8.
Thermistor reading
9.
Summary of settings
10.
11. Error history
Password protection
1.
1. Manual reset
14. SD card
Note: 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 controller will display a reminder message
prompting the installer to stop operation before continuing. By
selecting "Yes" the unit will cease operation.
Manual operation
During the filling of the system the water circulation pump, 3-way valve, and
mixing 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 FTC4.
From the service menu use F1 and F2 buttons to scroll through list until
1.
Manual Operation is highlighted.
Press CONFIRM.
.
. Manual operation menu screen is displayed.
4. To activate manual operation press the function button under the desired part.
►Example
Pressing F3 button will switch manual operation mode ON for the main 3-way
valve. When filling of the DHW tank is complete the installer should access this
menu again and press F3 to deactivate manual operation of the part. Alternatively
after 2 hours manual operation mode will no longer be active and FTC4 will
resume control of the part.
NOTE: 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 last operation.
OCH531
Screen 1 of service menu
Screen  of service menu
System off prompt screen
Being selected Being running
Manual operation menu screen
System off prompt screen
6
Error indication