Viessmann VITODENS 200 Start-Up And Service Instructions page 30

Troubleshooting
Diagnosis
(continued)
Control unit for weather-responsive operation
with programming unit
Diagnostics table: Faults with fault display on control unit
Fault message in display window
Control unit for
weather-responsive operation with
programming unit
FAULT:
OUTDOOR TEMP. SENSOR
FAULT:
OUTDOOR TEMP. SENSOR
FAULT:
SUPPLY TEMP. SENSOR
FAULT:
SUPPLY TEMP. SENSOR
FAULT:
BOILER TEMP. SENSOR
FAULT:
BOILER TEMP. SENSOR
FAULT:
SUPPLY TEMP. SENSOR
FAULT:
SUPPLY TEMP. SENSOR
FAULT:
TANK TEMP. SENSOR
FAULT:
TANK TEMP. SENSOR
FAULT:
EXT.PROG.2
30
Display window
Reset button
Burner
fault indicator
Burner
fault indicator (red)
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
System behavior
Boiler operates based on 32 ºF/0 ºC outdoor temperature.
Boiler operates based on 32 ºF/0 ºC outdoor temperature.
Supply temperature of heating circuits too low.
Supply temperature of heating circuits too low.
Boiler cools down.
Boiler cools down.
Mixing valve is opened.
Mixing valve is closed.
DHW tank cools down.
DHW tank cools down.
Boiler cools down