Viessmann VITOTRONIC 300 Installation And Service Instructions Manual page 40

Scanning and resetting "Maintenance" display
Please note:
Set code "24:1" and then code "24:0", if maintenance is implemented before
"Maintenance" is displayed; the set maintenance parameters for hours run
and periods are reset to 0.
40
220
º
1. c
2.
a b
3. d
d
Please note:
An acknowledged maintenance
message can be redisplayed by
pressing d (approx. 3 seconds).