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10. Troubleshooting
PNEG-552 100 Series Dryer 59
Bottom auger does not start. 1. Check that the bottom auger circuit breaker is ON.
2. If the lighted switch does not light, the output power to the
contactor is missing. Check connections, and whether the bulb
is burned out.
3. Check that the unload switch is ON (1 Speed 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.
Grain not moving through columns. 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.
3. Empty the dryer. Keep the dryer clean. Do not allow fine material
to gather in the plenum chamber.
4. It may be necessary to open the strike off plates in the affected
columns in half inch intervals.
Uneven drying-Some kernels appear brown while
others are under dried.
1. Check plenum thermostat temperature setting. Some varieties of
grain are more sensitive to higher operating temperatures. It
may be necessary to lower the plenum operating temperature to
accommodate this.
Uneven heat exiting from dryer columns. 2. Check for proper burner alignment (side to side). Vibration
during shipment may have caused misalignment.
Burner does not fire with fan operating. 1. Burner switch must be ON.
2. Check for power to ignition board.
Heater light and gas solenoids go ON and OFF
erratically. The light blinks ON and OFF while the
solenoids “chatter”.
1. The blinking light indicates the flame sensor is not
detecting flame.
2. The “chattering” solenoids are caused by the loss of flame
detection and the thermostat, and Fenwal Ignition Board trying
to reestablish a flame. Check for loose wires on flame sensor;
replace or repair wires or sensor.
Burner does not fire. No gas pressure with fan
operating at least 15 seconds (gas supply or fan
heater malfunction).
1. Check gas supply. Also, check gas filter and gas line for possible
obstruction or closed valves. Refill tank; replace or repair parts,
as required.
2. Inspect gas solenoid valves (including liquid valve on LP units)
for defective coils or improper wiring. Replace valve or coil if
valve will not open with proper voltage applied (115 volts).
3. Check for proper voltage. 115 volts across L1 and L2 incoming
voltage to the Fenwal Ignition Board and 115 volts outgoing
across V1 and V2 to the solenoids.
Burner does not fire but gauge shows gas pressure.
1. Fenwal Ignition Board: Check board for spark by removing
ignition wire from board, and holding an insulated screwdriver
against the output terminal and 1/4" away from the control box
casing. There should be a strong spark. Check board wire
connections. Replace the Fenwal Board, if necessary.
2. Ignitor: Check that the ignitor is properly gapped to 1/8" and that
it has a strong spark. Inspect the porcelain and electrodes for
damage or cracking. Replace or clean if necessary.
Burner maintains desired drying temperature-but
cycles from high-fire to OFF (without going to
low-fire).
1. Make sure the low flow control valve is not completely closed.
Valve must be adjusted open to provide the proper low-fire gas
pressure listed in this manual.
2. Check low-fire solenoid valve for proper operation.
Problem Possible Cause