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Problem
Display shows "FAN 1, 2 OR 3 FAILURE-NO AIRFLOW"
message.*
Display shows "FAN 1, 2 OR 3 CANNOT START-CHECK
AIR SWITCH" message.*
Fan motor will not start.
Top auger will not start.
Bottom auger will not start.
Grain not moving through columns.
Possible Cause
The air switch contacts have opened, indicating the fan
may not be turning. The air switch may need adjustment.
The air switch contacts have closed prior to the fan
starting, indicating a freewheeling blade or improper setting
of air switch.
1. Check that the fan circuit breaker and the fan switch are
on. Also, check for defective switch or bad wiring connections.
2. If lighted switch does not light, the air switch needs
adjustment, or the bulb may be burned out.
3. Verify closing of fan motor contactor. Check voltage on
load side of contactor. See appropriate power wiring
circuit diagram for terminal numbers. Inspect contactor
for defective points or a burned out coil.
4. Inspect connections, and check voltage applied to the
motor leads in the fan heater box to determine if the
motor is defective.
5. Check capacitors on single phase motors, and replace if
defective. If motor starts slowly, check for low voltage
during starting due to excessive voltage drop in power
supply wiring.
1. Check that the top auger circuit breaker and the load
auger switch are turned on.
2. If lighted switch does not light, the output power to the
contactor is missing. Check connections, or if the bulb is
burned out.
3. Check position of the upper auger paddle switch. It
must be down to start auger.
4. Inspect for secure mounting and wiring of mercury
switch in the terminal box on the top auger paddle
switch shaft. Include check for a defective mercury switch.
5. Verify closing of the top auger contactor. Check voltage on
load side of contactor. Inspect contactor for defective
points, or a burned out coil.
6. Inspect connections, and check voltage applied to motor
leads in motor junction box to determine if motor is defective.
7. Check that the mercury switch box is in the proper position.
1. Check that the bottom auger circuit breaker is on.
2. If the lighted switch does not light, the output power to
the contractor is missing. Check connections, and
check to see if the bulb is burned out.
3. Check that the unload switch is on (1 or 2 speed).
4. Verify closing of bottom auger contactor; check voltage
on load side of contactor.
5. If using the moisture control, check for proper setting, or
defective operation of the control.
6. Check for any loose wire connections in unload auger
and moisture control thermostat circuits.
1. Check the dryer for fine material buildup inside the
columns.
2. Avoid leaving the dryer columns full for long periods at a
time (2-3 days) while not operating the dryer, or during
rainy weather.
* The number in the warning message designates the fan, burner or plenum where the problem is located. All areas are
numbered from the bottom up. For example, the bottom fan is number 1, and the top fan is number 3.
TROUBLE ANALYSIS PROCEDURE