Viessmann VITOCAL 350-A, Installation And Service Instructions Manual

Page: 153 / 256

153
Display system of information and
fault index
Four different messages are possible at
each position in the information index
and fault index. The control unit displays
these messages with the codes 1, 2, 4
and 8. If several messages are active
simultaneously, the relevant codes are
added hexadecimally. Hexadecimal
totals are unique, i.e. the individual
active codes can be determined accord-
ing to the following table.
Active codes C
Display value Active codes
1 2 4 8
"0"
"1" X
"2" X
"3" X X
"4" X
"5" X X
"6" X X
"7" X X X
"8" X
"9" X X
"A" (
≙
10) X X
"B" (
≙
11) X X X
"C" (
≙
12) X X
"D" (
≙
13) X X X
"E" (
≙
14)
X X X
"F" (
≙
15)
X X X X
How to analyse the information index
and fault index
1. Check the display value for each posi-
tion individually.
2. Determine active codes C from the
table.
3. See tables E
and
I
for explana-
tions of active codes.
Information index "I" I
Position Code Explanation
Most recent commands transferred from the heat pump control unit to the EEV con-
troller
1 4 Message received regarding EEV controller restart
Troubleshooting
Control unit diagnostics
(cont.)
5414 828 GB
Service