Bradford White U-TW4-75S-76R-3N - Manual (Page 16)

Page 16
Abnormal Operation (cont’d)
5. Flame Sensing Fault:
A) Flame Lost During Run: The gas control turns off the pilot and main
valves and runs the blower for 15 seconds (inter-purge) The gas control
increments the recycle count, if the recycle count has not reached its
limit (4), another trial for ignition begins. If the recycle count has been
reached, the gas control LED flashes 6 times then 3 times with a 3 sec-
ond pause. The gas control waits 5 minutes before repeating the igni-
tion sequence.
B) Flame Sensed Out of Sequence: The gas control only looks for pilot
flame when the blower is running. If flame is present when the pilot
valve is not open, the gas control proceeds to wait for flame loss and
flashes 5 times with 3 second pause. This continues until flame is lost,
once the flame signal is lost, the control flashes 6 times then 4 times
with a 3 second pause. The control waits 5 minutes before repeating the
ignition sequence.
Sequence of Operation
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