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2. Restriction in ductwork...
a. Dryer back draft damper is sticking partially closed.
b. Restriction/obstruction in ductwork...
1) Check ductwork from dryer ALL the way to the outdoors.
3. Insufficient make-up air.
4. Impellor (fan and blower) is rotating in the wrong direction (for 3-phase [3ø] Models ONLY).
5. Lint screen is dirty or is not being cleaned often enough.
6. Inadequate airflow...
a. Impellor (fan and blower) failure.
GAS MODELS...
1) Low and/or inconsistent gas pressure.
Natural gas pressure - must be a consistent 3.5 inches (8.7 mb) of water column (W.C.).
Liquid Propane (L.P.) gas pressure - must be a consistent 10.5 inches (26.1 mb) of water
column.
2) Poor air and gas mixture at burner (too much gas or not enough air) at the burner...yellow or poor
flame pattern...
a) Not enough make-up air.
b) Restriction in the exhaust ductwork.
c) Gas pressure too high.
d) Impellor (fan and blower) is rotating in the wrong direction (for 3-phase [3ø] Models
ONLY).
e) Burner orifice size (drill material size [D.M.S]) too large for application (i.e., high elevation).
3) Sail switch is fluttering...
a) Restriction in the exhaust ductwork...
(1) Lint screen is dirty or is not being cleaned often enough.
4) Gas supply may have too low a heating value.
NOTE: Lint accumulation on the sensor bracket can act as an insulator, which will affect the accuracy
of the automatic drying cycle.