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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Fault Messages
(continued)
Wiring Diagram
Fault Messages
(continued)
BCU Burner Control Unit
Legend
A3 BCU burner control unit
A HMU heat management unit (plug 156)
B HMU heat management unit (terminal X4)
C Flue gas temperature sensor
D Boiler water temperature sensor 1 and 2
E Gas solenoid valve and fan motor with PWM
switching and feedback
F Boiler flow switch
G Ignition unit and flame monitoring
H DHW flow switch (B1KE only)
K Internal circulation pump (primary pump)
L 3-way diverter valve
M DHW outlet temperature sensor (B1KE only)
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