Technical data

Vitodens 200-W B2HA 19, 28, 35 Service
5683 702 - 07
72
Fault Codes (continued)
Troubleshooting
*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
40 Mixing valve closes Heating circuit 2 with
mixing valve supply
short circuit on
temperature sensor
Check the supply
temperature sensor
(see page 80).
44 Mixing valve closes Short circuit, flow
temperature sensor,
heating circuit 3
(with mixing valve)
Check flow temperature
sensor (see page 80).
48 Mixing valve closes Heating circuit 2 with
mixing valve supply
temperature sensor
cable broken
Check the supply temperature
sensor (see page 80).
4C Mixing valve closes Flow temperature
sensor cable broken
circuit 3 (with mixing
valve)
Check flow temperature
sensor (see page 80).
50 No DHW heating Short circuit on DHW
tank temperature
sensor %
Check the DHW sensor %
(see page 80).
58 No DHW heating Tank temperature
sensor % cable broken
Check the sensor %
(see page 80).
90 Control mode Short circuit on
temperature sensor /
Check sensor / on solar
control module.
91 Control mode Short circuit on
temperature sensor
Check sensor on solar
control module.
92 No solar DHW heating Short circuit on collector
temperature sensor &
Check the sensor at the
solar control module.
93 Control mode Short circuit on collector
temperature sensor &
Check the sensor at the
solar control module.
94 No solar DHW heating Short circuit on tank
temperature sensor %
Check the sensor % at the
solar control module.
98 Control mode Tank temperature
sensor / cable broken
Check sensor / on solar
control module.
99 Control mode
Temperature sensor
cable broken
Check sensor
on solar
control module.
9A No solar DHW heating Collector temperature
sensor & cable
broken
Check the sensor & at the
solar control module.
9B
DO NOT USE
Control mode Tank temperature
sensor cable broken
Check temperature sensor at
connection S3 to the Vitosolic
solar control.