Viessmann VITODENS 200-W Service Instructions Manual page 74

Troubleshooting
Fault Codes
(continued)
Fault code Detailed fault
on display code*2
9C -
9E -
9F -
A3 -
A4 -
DO NOT
USE
A7 -
B0 141
B1 -
B5 -
B7 -
B8 141
BA -
BB -
BC -
*1 Control mode: Boiler/burner fully operational (fault code must be verified and reset).
Burner in fault mode: Boiler control requires manual reset before burner can resume operation.
Burner blocked: If fault cause is corrected, burner resumes operation.
*2 Detailed fault code coding address 38:xx (if available).
74
System behavior*1
No solar DHW heating
Control mode
Control mode
Burner blocked
Control mode
Control mode (stays in
factory default setting)
Burner blocked
Control mode (stays in
factory default setting)
Control mode
(factory default setting)
Burner blocked
Burner blocked
Mixing valve regulates to
a flow temperature of
68°F (20°C)
Mixing valve regulates to
a flow temperature of
68°F (20°C)
Control mode without
remote control
Vitodens 200-W B2HA 112, 150 Service
Cause
Tank temperature
sensor % cable broken
No flow rate in collector
circuit or flow rate too
low or temperature
limiter has responded
Solar control module
faulty
Flue gas temperature
sensor not properly
positioned
Max. system pressure
exceeded
Faulty programming
unit
Flue gas temperature
sensor shorted out
Communication fault;
programming unit
(internal)
Internal fault
Boiler coding card
missing, faulty or
incorrect boiler coding
card
Flue gas temperature
sensor cable broken
Communication fault -
accessory kit for
heating circuit 2 with
mixing valve
Communication error,
extension kit for heating
circuit 3 (with mixing
valve)
Communication error,
remote control Vitotrol
heating circuit 1
(without mixing valve)
Corrective action
Check temperature sensor %
on solar control module.
Check solar circuit
pump and solar circuit.
Acknowledge fault message.
Replace solar control module.
Properly install flue gas
temperature sensor.
Check system pressure (max.
system pressure 3 bar).
Check the function and sizing
of the diaphragm expansion
vessel. Vent the heating system
Replace the programming unit.
Check flue gas temperature
sensor (see page 81).
Check connections and
replace programming unit
if required.
Replace the control unit.
Plug in boiler coding card or
replace if faulty.
Check flue gas temperature
sensor (see page 81).
Check extension kit connections
and code.
Check extension kit connections
and code.
Check connections, cable,
coding address "A0" in "Heating
circuit" group and remote
control unit setting.