Viessmann VITOTRONIC 100, HC1 Installation And Service Instructions Manual page 50

Troubleshooting – Vitotronic 300-K
Faults displayed at the programming unit
Fault
System characteristics
code
5 5 5 5 0 0 0 0 DHW tank primary pump ON:
Set DHW temp.= set boiler water
temp., priority controls are cancelled
or
With DHW tank primary system:
DHW heating is started and stopped
by DHW tank temp. sensor 2 (not
used)
5 5 5 5 1 1 1 1 With DHW tank primary system:
DHW heating is started and stopped
by DHW tank temp. sensor
5 5 5 5 8 8 8 8 DHW tank primary pump ON:
Set DHW temp.= set boiler water
temp., priority controls are cancelled
or
With DHW tank primary system:
DHW heating is started and stopped
by DHW tank temp. sensor 2 (not
used)
5 5 5 5 9 9 9 9 With DHW tank primary system:
DHW heating is started and stopped
by DHW tank temp. sensor
6 6 6 6 0 0 0 0
Boiler with maximum temp.,
return control open return control open
6 6 6 6 8 8 8 8
7 7 7 7 0 0 0 0
With DHW tank primary system:
Mixing valve primary circuit closed, Mixing valve primary circuit closed,
no DHW heating (not used). no DHW heating (not used).
7 7 7 7 8 8 8 8
8 8 8 8 4 4 4 4
Control mode
8 8 8 8 5 5 5 5
8 8 8 8 6 6 6 6
8 8 8 8 7 7 7 7
8 8 8 8 C C C C C C C C c c c c
8 8 8 8 d d d d
8 8 8 8 e e e e
8 8 8 8 f f f f
50
(continued)
Cause
DHW tank temperature sensor 1
shorted out
DHW tank temperature sensor 2
(not used) shorted out
DHW tank temperature sensor cable
broken
DHW tank temperature sensor 2
(not used) cable broken
Sensor incorrectly connected
Temperature sensor aJB shorted
out
Temperature sensor aJB cable
broken
Maintenance or error on Vitotronic
100 of boiler 1 to 4 100 of boiler 1 to 4
Communication fault Vitotronic 100
of boiler 1 to 4 of boiler 1 to 4
8C - Boiler No. 1
8D - Boiler No. 2 8D - Boiler No. 2
8E - Boiler No. 3
8F - Boiler No. 4 8F - Boiler No. 4
Remedy
Check DHW tank temp. sensor
Set code "4A:0"
Check temperature sensor
Without temperature sensor: Without temperature sensor:
Set code "4b:0" Set code "4b:0"
Check maintenance display or fault
code on the respective Vitotronic code on the respective Vitotronic
100
Check and replace cascade
communication module of the communication module of the
Vitotronic 100 and connecting
cable, if required cable, if required
- check for assigned participant no.
(see address 07: on page 9 and 80) (see address 07: on page 9 and 80)
- if problem persists, replace all 4
modules with part no. 7441 586.