FLY ds115 plus Service Manual page 28

4.4 Keypads not work
Key 147* or key 2580
or key 369# nor work?
yes
The resistance to
ground of these
keypads ok?
yes
Change U0100
FLY SERVICE SUPPORT
Keypad not work
yes
no
Only one key not work
yes
Clean or change the
domesheet
no
Heat or change U0100
28
Key 123 or key 456 or
no
key 789 or key *0#
not work?
yes
The resistance to
ground of these
keypads ok?
no yes
Change U0100