Viessmann Vitotronic 200 Installation And Service Instructions For Contractors page 101

Fault messages
(cont.)
Cause
Short circuit, flue gas temperature sensor
B1 Communication fault, programming unit
Control mode
Cause
Communication fault, programming unit
B5 EEPROM error
Control mode
Cause
Internal fault
B6 Invalid application
Continuous operation
Cause
Invalid application
B7 Coding card
Boiler is regulated by the temperature controller.
Cause
Fault, coding card
B8 Flue gas temperature sensor disconnection
Control mode
Cause
Flue gas temperature sensor disconnection
BA Communication error, PCB extension, HC 2 and HC 3
Mixer close
Cause
Communication error, PCB, extension for heating circuit
2 and heating circuit 3, each with mixer
Measure
Check the flue gas temperature sensor: See chapter
"Checking temperature sensors"
Measure
Check connections; replace programming unit if neces-
sary.
Measure
Replace the low voltage PCB.
Measure
Repeat commissioning.
Measure
Insert or replace the coding card: See chapter "Inserting
the coding card"
Measure
Check the flue gas temperature sensor: See chapter
■
"Checking temperature sensors"
Without flue gas temperature sensor: Set parameter
■
"1F:0" in the "Boiler" group.
Measure
Check that the PCB and ribbon cable are plugged in
correctly, and replace PCB if required.
Troubleshooting
101