Icemaker Troubleshooting - Follett Symphony 12 Series Installation, Operation And Service Manual

Icemaker 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. No power to unit.
1. Icemaker will
2. Open bin level control.
not run.
3. Water OK LED (WTR) not on.
System status:
4. 20M or 2ND LED is on indicating
compressor,
gearmotor,
and fan motor
5. Gear motor locked up (immediate
inoperative.
6. Open coil on gearmotor start relay
1. Condenser coil plugged causing open
2. Compressor will
not run.
2. Defective starting capacitor.
System status:
3. Defective starting relay.
gearmotor and
4. Open motor winding.
fan motor run.
5. No power output from compressor
1. Float reservoir running dry, sensing
3. Unit cycles
intermittently.
System status:
compressor,
gearmotor, and
fan motor cycle.
1. Dirty condenser coil.
4. Low ice
2. Restricted air fl ow to condenser coil.
production.
3. Mineral coated evaporator.
Poor quality ice.
4. Improper exhaust air provisions.
5. Faulty expansion valve.
6. Low refrigerant charge.
7. Superheat incorrect.
8. Inefficient compressor.
1. O ring seal broken.
5. Water leaks
from bottom of
evaporator.
Indicators/possible cause
that fi rst or second torque error has
occurred.
torque error indicated by LEDs when
board is reset).
causing an immediate torque error.
overload or high pressure cut-out.
output terminal on control board.
probe signalling for system to shut
down.
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.
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.
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. 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 TEV sensing bulb is securely
clamped in place and not damaged;
check that insulated bulb cover is in
place.
8. Replace compressor.
1. Replace O ring.
26
Corrective action