Ice machine troubleshooting
Flashing water LED at any time indicates that water signal to board had been lost for more than one second.
Ten-second delay: There is a 10 second delay in reaction to loss of water (WTR) or bin (B-E) signals. If signals are not
lost for more than 10 seconds, no reaction will occur.
Problem
Indicators
Corrective Action
Ice machine will not
run.
System status:
compressor,
gearmotor, and fan
motor inoperative.
1. No power to unit.
2. Open bin level control.
3. Water OK LED (WTR) not on.
4. 20M or 2ND LED is on indicating that first or
second torque error has occurred.
5. Gear motor locked up (immediate torque error
indicated by LEDs when board is reset).
6. Open coil on gearmotor start relay causing an
immediate torque error.
1. Check that unit is plugged in, circuit breakers are on.
2. Adjust or replace ice level control.
3. Check reservoir for water, restore water to unit.
4. See #6 below.
5. Repair or replace gearmotor.
6. Replace gearmotor start relay.
Compressor will not
run.
System status:
gearmotor and fan
motor run.
1. Condenser coil plugged causing open overload or
high pressure cut-out.
2. Defective starting capacitor.
3. Defective starting relay.
4. Open motor winding.
5. No power output from compressor output terminal
on control board.
1. Clean condenser coil and replace overload if
necessary.
2. Replace start capacitor.
3. Replace relay.
4. Ohm out windings and replace compressor if
necessary.
5. Check terminal connection and replace control board
if necessary.
Unit cycles
intermittently.
System status:
compressor, gearmotor,
and fan motor cycle.
1. Float reservoir running dry, sensing probe
signalling for system to shut down.
1. Check water supply to float and float operation. PC
board will have flashing WTR LED.
Low ice production.
Poor quality ice.
1. Dirty air filter or condenser coil.
2. Restricted air flow to condenser coil.
3. Mineral coated evaporator.
4. Improper exhaust air provisions.
5. Faulty expansion valve.
6. Low refrigerant charge.
7. Superheat incorrect.
8. Inefficient compressor.
1. Clean or replace filter, clean condenser.
2. Remove obstruction.
3. Clean evaporator.
4. Provide proper exhaust air provisions per Follett
installation manual.
5. Replace expansion valve.
6. Check for leaks; repair, evacuate, and weigh in correct
charge.
7. Check that TXV sensing bulb is securely clamped in
place and not damaged; check that insulated bulb
cover is in place.
8. Replace compressor.
Water leaks
from bottom of
evaporator.
1. O ring seal broken.
1. Replace O ring.
Ice machine runs for
short period of time
and shuts down on
torque error.
System status: 20M or
2nd LED is lit.
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 fills to capacity.
1. Eliminate kink and check that tube routing complies
with Follett ice machine installation manual.
2. Adjust or replace control.
3. Replace complete length 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. Refer to dispenser
manual for proper thermostat and ice tube mounting.
Evaporator is iced up
on the outside. No ice
production.
System status:
compressor, gearmotor
and fan motor running.
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. Check for broken gearmotor output shaft or damaged
gearbox.
2. Check for defective water sensor (water OK (WTR)
LED remains on even when float empty or probe
removed from water).
3. Purge air from line.
30
T400A/W, MCD400A/W, R400A/W, MFD400A/W, D400A/W Ice Machines
