American Dryer Corp. MDG-30 - Manual (Page 43)

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1. Direct Spark Ignition (DSI) ignitor and flame-probe are out of adjustment, reposition closer to the flame
area.
2. Sail switch is fluttering...
a. Lint screen is dirty.
b. Restriction in exhaust ductwork.
3. Insufficient make-up air.
4. Failed ignitor and flame-probe assembly.
5. Failed DSI module.
6. Failed gas valve.
N. Heating unit is not operating (no heat) and heat indicator dot is on...
1. Fault in sail switch circuit...
a. Sail switch is out of adjustment or has failed.
b. Sail switch damper is not closing or is fluttering...
1) Lint screen is dirty.
2) Restriction in exhaust ductwork.
2. Fault in burner hi-limit circuit or thermostat.
3. Fault in lint chamber sensor bracket hi-heat protector thermostat.
4. Failed DSI module.
5. Failed DSI ignitor and flame-probe assembly.
6. Failed microprocessor controller (computer).
O. Dryer operates but is taking too long to dry...
1. Exhaust ductwork run is too long or is undersized, back pressure must be no less than 0 and cannot
exceed 0.3 inches (0.74 mb) of water column (W.C.).
2. Restriction in exhaust ductwork...
a. Exhaust back draft damper is sticking partially closed.
b. Restriction in ductwork, check ductwork from dryer ALL the way to the outdoors.
3. Low or inconsistent gas pressure.