American Dryer Corp. ML-75DIII - Manual (Page 51)

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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 three (3) 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.