Scanning And Resetting The "Maintenance" Display - Viessmann Vitodens 333 Service Instructions Manual

Initial start-up, inspection, maintenance
Further details regarding the individual steps

Scanning and resetting the "maintenance" display

The red fault indicator flashes when the limits set via coding addresses "21" and
"23" have been reached. As regards the programming unit display:
&
For a constant temperature control unit:
The defaulted hours run or the defaulted interval with clock symbol "u" (sub-
ject to setting)
&
For a weather-compensated control unit:
"Maintenance"
Note
Set code "24:1" and then code "24:0" if maintenance is carried out before main-
tenance is displayed; the set maintenance parameters for hours run and inter-
vals are then reset to 0.
Press the following keys:
1. c
The maintenance scan is
active.
2. a/b Scan maintenance mes-
sages.
After maintenance has been carried out
1. Reset code "24:1" to "24:0".
The red fault indicator extin-
guishes.
Note
A new maintenance message will
be displayed 7 days later, if coding
address "24" is not reset.
38
(cont.)
3. d
The maintenance display
will be cleared (for a
weather-compensated
control unit: "Acknowledge:
Yes" re-confirm with d).
The red fault display con-
tinues to flash.
Note
An acknowledged maintenance mes-
sage can be redisplayed by pressing
d (approx. 3 s).
2. Reset the burner hours run, burner
starts and consumption, if required
Press the following keys:
c
Scanning is active (see
page 67).
a/b for the selected value.
e
the selected value will be
set to "0".
a/b for further scans.
d
Scanning is completed.