MULTI- ZONE / FROZEN FOOD VENDOR • 3576 • 4222618A | 31
The sealed hermetic system should not be worked on outside the Factory
Service Center
. There are three things that can go wrong with a sealed system and
should be repaired only at the Factory Service Center. These are:
1. Low Charge - usually caused by leaks; look for oil around seals and welds. Unit will
not cool properly.
2. Restriction in Systems (unit frosts, then melts) - not cooling properly.
3. Bad valves - unit does not cool properly-- noisy compressor.
COMPRESSOR WILL NOT START
Compressor has no power:
• Vending machine not plugged in.
• Tripped circuit breaker or blown fuse.
• Faulty wall outlet or improper wiring.
• Faulty (short or open) power cord.
• Temperature sensor circuit is open. If
temperature reading of SENSOR1 is “-
-- °F“, then check sensor harness
connection or defective sensor.
• Low voltage. Check the power source
with a volt meter. Minimum 103V for
115VAC, 60Hz. Minimum 195V for
230VAC, 50 Hz.
• Check motor protector (overload). See
page 33, Troubleshooting Circuits with
Multi-Meter.
• No DC voltage. Check control board
terminals J14-8, J14-14 for a loose
connection.
• Check compressor starting relay. See
page 33, Troubleshooting Circuits with
Multi-Meter.
• Check compressor winding. See page
33, Troubleshooting Circuits with
Multi-Meter.
• Defective refrigeration control relay.
Switch the controller to Service Mode
then verify that the relay turns on by
using the TEST RELAY menu.
• Unplug power to the vending machine.
Open the power panel. Use insulated
jumper wires to short the wire
terminals on RELAY1; between 2 and
4. Restore power to the vending
machine. The compressor should
start, indicating a problem in the
control circuit.
• Check relay terminals 1 to 0 with a
Multi-Meter. Should have 24VDC
applied to them.
• Check the door switch operation. See
Door Switch section on page27.
COMPRESSOR TRIPS ON OVERLOAD
1. Improper voltage: Check power
source with volt meter. Acceptable
range is 103-127VAC for 115V
(60Hz), or 195-255VAC 230V (50Hz).
2. Defective starting relay. Won’t open
after starting. Check compressor
starting relay. See page 33,
Troubleshooting Circuits with Multi-
Meter.
3. Compressor has shorted windings.
Check compressor winding resistance
values. See page 33, Troubleshooting
Circuits with Multi-Meter.
4. Short in other component: Isolate and
eliminate each electrical component
until short is found.
5. Compressor is too hot.
♦ Dirty condenser.
♦ Faulty condenser motor or blade.
♦ Restricted airflow. Check for
clogged air filter. Check for clogged
inlet and outlet screens.
6. Defective or worn out overload: Trips
too fast or too often.
CAUTION: Replace air filter every 3 months to maintain proper
air circulation to the condenser and to prevent dirt and debris
from clogging up the condenser.
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