ST620RF INSTRUCTION MANUAL32
Once the SERVICE date has been reached, the system will only operate at the
temperature that was previously set in SERVICE mode. The display will no
longer display the operating mode, only the telephone number that has been
entered and the SERVICE indicator (which will continue to flash).
To enter the SERVICE menu, press the OK or Arrow keys, and enter the code
you originally set to access SERVICE mode. Once back in SERVICE mode, you
can edit the telephone number, set a new servicing date, or turn SERVICE mode
ON or OFF in exactly the same way as described earlier.
OR
CONTROL MENU
By selecting the Control menu, the installer can change the control method used by the programmable thermostat
- either ON/OFF or Pulse Width Modulation (PWM). The default setting is ON / OFF.
On entering the menu, scroll to select the preferred option (ON/OFF or PWM control), and confirm the choice using
the OK button. Use the Arrow key to return to the Menu Option display. PWM mode should only be selected by
the Engineer carrying out the installation or other qualified person.