MALFUNCTION
Compressor will
not start — no hum
Compressor will not
start — hums but trips
on overload protector
Compressor starts,
but does not switch
off of start winding
Compressor starts
and runs, but short
cycles on overload
protector
Unit runs OK,
but short cycles
Unit operates long
or continuously
Start capacitor open,
shorted or blown
Run capacitor open,
shorted or blown
Relay defective
or burned out
Space temperature
too high
Cooler freezing
beverage
Unit noisy
POSSIBLE CAUSE
1. Line cord not plugged in.
2. Fuse removed or blown.
3. Overload protector tripped.
4. Control stuck in open position.
5. Wiring improper or loose.
1. Improperly wired.
2. Low voltage to unit.
3. Starting capacitor defective.
4. Relay failing to close.
1. Low voltage to unit.
2. Relay failing to open.
3. Run capacitor defective.
4. Compressor motor has a winding open or
shorted.
1. Additional current passing through
overload protector.
2. Low voltage to unit.
3. Overload protector defective.
4. Run capacitor defective.
5. Excessive discharge pressure.
6. Compressor too hot — return gas hot.
1. Overload protector.
2. Cold control.
3. Overcharge.
4. Air in system.
5. Undercharge.
1. Shortage of refrigerant.
2. Control contacts stuck or frozen closed.
3. Evaporator coil iced.
4. Restriction in refrigeration system.
5. Dirty condenser.
1. Relay contacts not opening properly.
2. Low voltage to unit.
3. Improper relay.
1. Improper capacitor.
2. Excessively high line voltage.
(110% or rated-max.).
1. Incorrect relay.
2. Line voltage too high or too low.
3. Relay being influenced by loose vibrating
mounting.
1. Control setting too high.
2. Improper overcharge.
3. Inadequate air circulation.
1. Control setting.
1. Loose parts or mountings.
2. Tubing rattle.
3. Bent fan blade causing vibration.
4. Fan motor bearings worn.
SOLUTION
1. Plug in line cord.
2. Replace fuse.
3. Refer to electrical section.
4. Repair or replace control.
5. Check wiring against diagram.
1. Check wiring against diagram.
2. Determine reason and correct.
3. Determine reason and replace.
4. Determine reason and correct,
replace if necessary.
1. Determine reason and correct.
2. Determine reason and correct,
replace if necessary.
3. Determine reason and replace.
4. Replace compressor.
1. Check wiring diagram. Check for
added fan motors. pumps, etc.,
connected to wrong side of protector.
2. Determine reason and correct.
3. Check current, replace protector.
4. Determine reason and replace.
5. Check ventilation, restrictions in
cooling medium, restrictions in
refrigeration system.
6. Check refrigerant charge (fix leak)
add if necessary
1. Check wiring diagram.
2. Differential set too close — widen.
3. Reduce refrigerant charge.
4. Purge and recharge.
5. Fix leak, add refrigerant.
1. Fix leak, add charge.
2. Clean contacts or replace control.
3. Defrost.
4. Determine location and remove.
5. Clean condenser.
1. Clean contacts or replace relay
if necessary.
2. Determine reason and correct.
3. Replace
1. Determine correct size and replace.
2. Determine reason and correct.
1. Check and replace.
2. Determine reason and correct.
3. Remount rigidly.
1. Reset control.
2. Purge.
3. Improve air movement.
1. Reset control.
1. Find and tighten.
2. Reform to be free of contact.
3. Replace blade.
4. Replace motor.
ALL SERVICING MUST COMPLY WITH STATE AND FEDERAL REGULATIONS
SALES OFFICE: P.O. BOX 5932, SPARTANBURG, SOUTH CAROLINA 29304
PLANTS: SPARTANBURG, SOUTH CAROLINA • HONEA PATH, SOUTH CAROLINA
BROOKVILLE, PENNSYLVANIA
PHONE 803-582-8111 TOLL FREE NUMBER 1-800-845-9800
SERVICE AND
ANALYSIS CHART
REFRIGERATION
SYSTEM
ILA-1591 REV.B SHT 1
