Follett T400A Installation, Operation And Service Manual page 31

Troubleshooting
Problem
6. Ice machine runs
for short period
of time and shuts
down on torque
error.
System status:
20M or 2nd LED
are lit.
7. Evaporator is iced
up on the outside.
No ice production.
System status:
compressor,
gearmotor and fan
motor running.
8. Compressor cycles
intermittently.
System status:
gearmotor and fan
motor run.
9. Unit runs but not
making ice.
System status:
compressor,
gearmotor and fan
motor running.
10. Compressor and
fan motor will not
run. Gearmotor
runs.
11. Intermittent noises
from evaporator.
Indicators/possible cause
1. Kink in ice transport tube.
2. Bin level control remains in closed
position.
3. Ice transport tube ruptured internally.
4. Worn evaporator bearings.
5. Faulty gearmotor start relay. Ice machine
torques out within 5 seconds of start-up.
6. Torque-out occurs when storage bin fi lls
to capacity.
1. Gearmotor running but no output rotation.
2. Float reservoir empty.
3. Air bubble in water supply line. Water in
reservoir but not in evaporator.
1. Compressor start relay in wrong position.
2. High pressure cutout open due to high
head pressure.
3. Clogged or dirty condenser coil.
4. Improper ventilation.
5. Defective compressor.
1. Clogged or dirty condenser coil.
2. Compressor not pumping.
3. Low refrigerant charge.
1. Compressor switch in OFF position.
2. No output on compressor and fan motor
terminals on control board.
3. Failed fan motor causes high pressure
cut-out to open.
1. Mineral build-up on evaporator surface.
Corrective action
1. Eliminate kink and check that tube
routing complies with Follett ice
machine installation manual.
2. Adjust or replace control.
3. Replace complete run of ice transport
tube.
4. Inspect bearings for roughness or
binding and replace if necessary.
5. Replace gearmotor start relay.
6. Ensure that ice contacts bin
thermostat before backing ice up in
transport tube. Reference dispenser
manual for proper thermostat and ice
tube mounting.
1. Check for broken gearmotor output
shaft or damaged gearbox.
2. Check for defective water sensor
(water OK (WTR) LED remains on
even when fl oat empty or probe
removed from water).
3. Purge air from line.
1. Position relay with arrow or word "top"
facing up.
2a. Check supply and temperature of
water to w/c condenser.
2b. Check discharge pressure and adjust
water regulator value.
3. Clean condenser coil.
4. Provide inlet and exhaust air
provisions per Follett ice machine
installation manual.
5. Replace compressor.
1. Clean condenser coil.
2. Replace compressor.
3. Check for leaks; repair, evacuate, and
weigh in correct charge.
1. Turn compressor switch on.
2. Replace control board.
3. Replace fan motor.
1. Clean evaporator with liquid IM
cleaner.
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