American Dryer Corp. AD-75V - Manual (Page 48)

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2. For Models With Johnson Controls Direct Spark Ignition (DSI) Module (G760)
Theory Of Operation:
Start the drying cycle. When the gas burner
ignites within the chosen trial for ignition time
(6-seconds), the flame sensor detects gas
burner flame and signals the DSI module to
keep the gas valve open...as long as there is a
call for heat. The DSI module will
“LOCKOUT” if the gas burner flame is not
sensed at the end of the trial for ignition period.
The trial for ignition period will be repeated
for a total of two (2) retries/trials (the initial
try and two [2] more retries/trials). If the
flame is not sensed at the end of the third retry/
trial (inter-purge period of 30-seconds) the DSI
module will “LOCKOUT” (light emitting diode
[L.E.D.] flashes).
A steady L.E.D. indicator indicates normal
operation.
No L.E.D. indicator indicates a power or an
internal failure has occurred.