Viessmann Vitodens 200, Service Instructions Manual

Page: 41 / 116

41
Troubleshooting
Repairs
(cont.)
Relay test
(standard programming unit)
1. Set the heating program selector
switch to " T ".
2. Select the required position using
rotary selectorĂ" s ".
Function Rotary
selectorĂ" s "
Flashing display
ThreeĆway valve drive (DHW cylinder) N U :0:ă4
Heating circuit pumpĂA ć1 U :0:ă2
Heating circuit pump with extension kit
for a heating circuit with mixer
ć2 U :0:ă3
Mixer open +1 U :0:ă8
Mixer closed +2 U :0:ă7
DHW circulation pump ć4 U :0:ăd
No function ć3 U :0:ă1
Burner start with lower rated output
and heating circuit pump ON
ć5 Display of boiler
water temperature
Burner start with upper rated output
and heating circuit pump ON
ć6 Fault code display
from the fault
memory
(see pageĂ26)
3. Return the heating program
selector and rotary selectorĂ" s "
to their original positions.
5692Ă485
G
B
T
N
+5
-7 +8
-4