Viessmann VITOTRONIC 100 GC1B Installation And Service Instructions Manual page 86

Troubleshooting
Fault Display
(continued)
Fault Codes
Displayed System Characteristics
Fault Code
0F Control mode.
30
With DHW tank:
Circulation pump for DHW tank
heating on; boiler is maintained at set
DHW tank temperature.
Without DHW tank:
Boiler is regulated by the adjustable
high limit.
38
With DHW tank:
Circulation pump for DHW tank
heating on; boiler is maintained at set
DHW tank temperature.
Without DHW tank: Boiler is
regulated by the adjustable high limit.
50 DHW tank primary pump "ON":
Set DHW temperature
= Set boiler water temperature
Priority control is cancelled
or
With primary store system:
DHW tank heating is started and stopped
via DHW tank temperature sensor 2.
51 With primary store system:
DHW tank heating is started and stopped
via DHW tank temperature sensor 1.
52 Control mode.
58 DHW tank primary pump "ON":
Set DHW temperature
= Set boiler water temperature
Priority control is cancelled
or
With primary store system:
DHW tank heating is started and stopped
via DHW tank temperature sensor 2.
59 With primary store system:
DHW tank heating is started and stopped
by DHW tank temperature sensor 1.
5A Control mode.
60 Boiler with maximum temperature, no
output reduction, mixing valve return
temperature control "Open".
68 Boiler with maximum temperature, no
output reduction, mixing valve return
temperature control "Open".
86
Vitotronic 100, GC1B Installation and Service
Cause
Service "0F" is only
displayed in fault history.
Short circuit, boiler
water temperature
sensor.
Lead break, boiler water
temperature sensor.
Short circuit, DHW tank
temperature sensor 1.
Short circuit, DHW tank
temperature sensor 2.
Short circuit, supply
temperature sensor.
Lead break, DHW tank
temperature sensor 1.
Lead break, DHW tank
temperature sensor 2.
Lead break, supply
temperature sensor.
Short circuit,
temperature sensor
aJA.
Lead break,
temperature
sensor aJA.
Measures
Service required
Note: After servicing, set code "24:0".
Check the boiler water temperature
sensor (see page 116).
Check the boiler water temperature
sensor (see page 116).
Check the DHW tank temperature
sensor (see page 116).
Check the DHW tank temperature
sensor (see page 116).
Check the boiler water temperature
sensor (see page 116).
Check the DHW tank temperature
sensor (see page 116).
Check the DHW tank temperature
sensor (see page 116).
Check the supply temperature
sensor (see page 116).
Check temperature sensor (see page
116).
Check temperature sensor
(see page 116).
Without temperature sensor:
Set code "4A:0" in group 1
"General".