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Faulty temperature sensor or not
4.
mounted in the correct position.
5.
Temperature setting to warm
6.
Defective control board
UNIT OPERATES LONG OR CONTINUOUSLY
Problem
1.
Air flow restricted
2.
Gasket leak around door
3.
Excessive load
Refrigerant low or restriction in
4.
system
5.
Refrigeration relay shorted.
6.
Faulty controller
Ambient air temperature and relative
humidity
exceed
7.
operational standards.
Faulty temperature sensor or sensor
8.
has been moved or remounted to
wrong position.
REFREGERATED SPACE TO COLD
1.
Refrigeration setting to cold
2.
Faulty refrigeration relay
3.
Faulty controller
REFRIGERATED SPACE TOO WARM
1.
Refrigeration setting to warm
2.
Faulty temperature sensor
3.
Faulty refrigeration relay
4.
Air flow restricted
5.
Faulty controller
6.
Condenser air flow restricted
7.
Condensing space restricted
8.
Compressor
S T / V T V E N D O R • 3 5 6 8 3 5 6 7 3 5 6 6 3 5 6 5 •
See Temperature Control section and Factory Default Settings section of this
manual.
Possible Causes/Actions
Clogged or blocked in inlet screen, air filter or outlet screen
Exhaust area blocked. Vendor too close to the wall.
Faulty evaporator motor or blades causing coils to ice over.
Loose connections on evaporator motor (motor not running).
Air flow blocked by product placed in front of evaporator or air duct openings.
After loading, the unit will run longer to pull out excessive heat from product.
Switch the controller to Service Mode, then use the Test Relay menu to verify that
the relay turns off.
manufacturer's
See Refrigeration Setting instructions in machines programming manual
Switch the controller to Service Mode, and then verify that the relay turns on
by using the Test Relay menu.
Check relay terminals for continuity with a Multi-Meter.
See Refrigeration Setting instructions in host machines manual
If the temperature reading of Sensor1 is "- - -", then check connections and the
sensor harness.
Switch the controller to Service Mode and verify that the Relay1 turns on by
using the Test Relay menu.
Faulty evaporator motor or blades causing coils to ice over
Loose connections on evaporator motor (motor not running)
Plugged or dirty condenser
Condenser motor or blades bad
Condenser fan blade stuck
Unit placed too close to a wall. Should be 4 to 6 inches of space between machine
and the wall
Bad valves
Low charge or restriction in tube capillary starts frosting 8 to 10 inches past
evaporator connection tube
Check for oil around brazed connections
24
4 2 2 0 5 5 7 R E V A
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