Technical data

Vitodens 200-W B2HA 19, 28, 35 Service
73
5683 702 - 07
Troubleshooting
Fault Codes (continued)
*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.
Fault code on display System behavior*1 Cause Corrective action
9C No solar DHW heating Tank temperature
sensor % cable
broken
Check temperature sensor %
on solar control module.
9E Control mode No flow rate in collector
circuit or flow rate too
low or temperature
limiter has responded
Check solar circuit
pump and solar circuit.
Acknowledge fault message.
9F Control mode Solar control module
faulty
Replace solar control module.
A3 Burner blocked Flue gas temperature
sensor not properly
positioned
Properly install flue gas
temperature sensor.
A7 Control mode (stays in
factory default setting)
Faulty programming
unit
Replace the programming unit.
B0 Burner blocked Flue gas temperature
sensor shorted out
Check flue gas temperature
sensor (see page 80).
B1 Control mode (stays in
factory default setting)
Communication fault;
programming unit
(internal)
Check connections and
replace programming unit
if required.
B5 Control mode
(factory default setting)
Internal fault Replace the control unit.
B7 Burner blocked Boiler coding card
missing, faulty or
incorrect boiler coding
card
Plug in boiler coding card or
replace if faulty.
B8 Burner blocked Flue gas temperature
sensor cable broken
Check flue gas temperature
sensor (see page 80).
BA Mixing valve regulates to
a flow temperature of
68° F (20° C)
Communication fault -
accessory kit for
heating circuit 2 with
mixing valve
Check extension kit connections
and code.
BB Mixing valve regulates to
a flow temperature of
68° F (20° C)
Communication error,
extension kit for heating
circuit 3 (with mixing
valve)
Check extension kit connections
and code.
BC Control mode without remote
control
Communication error,
remote control Vitotrol
heating circuit 1
(without mixing valve)
Check connections, cable,
coding address “A0” in “Heating
circuit” group and remote
control unit setting.