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