Viessmann VITOTRONIC 300-K Operations Instructions Page 72

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Vitotronic 200 and 300-K Installation and Service
5693 976 - 04
72
Troubleshooting
Fault Display Vitotronic 300-K (continued)
Fault codes
Displayed fault code System characteristics Cause Measures
10 Activates at 32°F (0°C) outside
temperature
Short circuit, outside
temperature sensor
Check the outside
temperature sensor
(see page 90).
18 Activates at 32°F (0°C) outside
temperature
Lead break, outside
temperature sensor
Check outside temperature
sensor (see page 90)
20 Vitotronic 300-K regulates alone
without supply temperature sensor
(supply temperature may not be
high enough)
Short circuit, common
supply temperature sensor
Check the common supply
temperature sensor
(see page 90)
28 Vitotronic 300-K regulates alone
without supply temperature sensor
(supply temperature may not be
high enough)
Lead break, common supply
temperature sensor
Check the common supply
temperature sensor
(see page 90)
40 Mixing valve is closed. Short circuit, supply
temperature sensor, heating
circuit with mixing valve
M2 (heating circuit 2)
Check the supply
temperature sensor (see
page 90).
44 Mixing valve is closed. Short circuit, supply
temperature sensor, heating
circuit with mixing valve
M3 (heating circuit 3)
Check the supply
temperature sensor
(see page 90).
48 Mixing valve is closed. Lead break, supply
temperature sensor, heating
circuit with mixing valve
M2 (heating circuit 2)
Check the supply
temperature sensor (see
page 90).
4C Mixing valve is closed. Lead break, supply
temperature sensor, heating
circuit with mixing valve
M3 (heating circuit 3)
Check the supply
temperature sensor (see
page 90).
50 DHW tank primary pump “ON”:
set DHW temperature
= set supply temperature
Priority control is cancelled.
or
With primary store system:
DHW tank heating is started and
stopped by DHW tank temperature
sensor 2.
Short circuit, DHW tank
temperature sensor 1
Check the DHW tank
temperature sensor
(see page 90).
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