Thermor Pass Program Kit Fil Pilote Bedienungsanleitung Seite 17

2- Safety fuse
The pilot wire interface is fitted with a fuse to protect against
inappropriate installation or serious fluctuation sin the electrical
supply. If the fuse blows, the programmer sends no programming
instructions and the connected units operate in "Comfort" mode.
After correcting the installation, proceed as follows to replace the
fuse:
a- Remove the fuse holder and its fuse (manually)
b- Replace the fuse (100mA) with the replacement fuse.
c- Refit the fuse holder and fuse in its housing.
3- Anti-theft function
To avoid removal, the interface is fitted with a pin (FIG 1) to lock
the programmer in its operating position.