Troubleshooting - Follett T400A Installation, Operation And Service Manual

Troubleshooting chart
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
1. Ice machine will
not run.
System status:
compressor,
gearmotor, and fan
motor inoperative.
2. Compressor will
not run.
System status:
gearmotor and fan
motor run.
3. Unit cycles
intermittently.
System status:
compressor, gear
motor, and fan
motor cycle.
4. Low ice production.
Poor quality ice.
5. Water leaks
from bottom of
evaporator.
Indicators/possible cause
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 fi rst
or second torque error has occurred.
5. Gearmotor 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. 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. Float reservoir running dry, sensing probe
signalling for system to shut down.
1. Dirty condenser coil.
2. Restricted air fl ow to condenser coil.
3. Mineral coated evaporator.
4. High ambient water supply and/or air
temperature.
5. Improper exhaust air provisions.
6. Faulty expansion valve.
7. Low refrigerant charge.
8. Superheat incorrect.
9. Inefficient compressor.
1. O ring seal broken.
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 Problem #6.
5. Repair or replace gear motor.
6. Replace gearmotor start relay.
1. Clean condenser coil and replace
overload if necessary.
2. Replace start capacitor.
3. Replace relay.
4. Check winding resistance and
replace compressor if necessary.
5. Check terminal connection and
replace control board if necessary.
1. Check water supply to fl oat and fl oat
operation. PC board will have fl ashing
WTR LED.
1. Clean condenser.
2. Remove obstruction.
3. Clean evaporator.
4. Precool water and/or install air duct
per Follett installation manual.
5. Provide proper exhaust air provisions
per Follett installation manual.
6. Replace expansion valve.
7. Check for leaks; repair, evacuate, and
weigh in correct charge.
8. Check that TEV sensing bulb is
securely clamped in place and not
damaged; check that insulated bulb
cover is in place. Replace TEV if
necessary.
9. Replace compressor.
1. Replace O ring.
30
Corrective action