The technical settings are usually entered by the installer, for this reason you can find the technical settings in the Installer Instructions for your unit. Below is a quick guide reference:
ENTERING TECH SETTINGS
PROGRAMMABLE ROOM STATS
Switch the slider to OFF. Press and keep holding the A and H buttons together (under the facia), then press the Next button.
CHANNEL PROGRAMMERS
Move the slider to RUN. Hold down the Home button, the Day button and the – button (under the facia) together for 3 seconds.