DBW 2010 / 2016 3 Description of Operation
302
Fault switch-off only for heaters with sensor
technology with 1563/64 control unit
– 12 seconds after start-up due to detection of extraneous
light or in case of undervoltage
– during combustion operation as the result of undervolt-
age for at least 12 seconds. After a run-on of 90 seconds,
the heater is in fault lock-out.
After the fault cause is eliminated, the fault release is carried
out by switching the heater off and then on again.
Fig. 301 Operating sequence (heaters with 1553 control unit)
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