321023
74
Symptom
Possible Causes
Corrective Action
Unit runs continuously.
Temperature control set too cold.
Adjust temperature control.
Dirty condenser or obstructed grille.
Check condenser and grille. Clean.
Poor door seal.
Level cabinet. Adjust hinges. Replace
gasket.
Interior light remains on.
Check switch. Replace if necessary.
Faulty condenser fan or evaporator fan. Check fan and wiring. Replace if
necessary.
Faulty control.
Test control. Replace if failed.
Refrigerant shortage or restriction.
Check for leak or restriction. Repair,
evacuate and recharge system.
Refrigerant overcharge.
Check for overcharge. Evacuate and
recharge system.
Air in system.
Check for low side leak. Repair, evacuate
and recharge system.
Unit runs continuously. Temperature
normal.
Ice on evaporator.
See “Ice on evaporator”.
Unit runs continuously. Temperature too
cold.
Faulty defrost thermostat.
Check thermostat. Replace if necessary.
Noisy operation.
Loose flooring or floor not firm.
Repair floor or brace floor.
Cabinet not level.
Level cabinet.
Tubing in contact with cabinet, other
tubing, or other metal.
Adjust tubing.
Drip pan vibrating.
Adjust drain pan.
Fan hitting another part.
Ensure fan properly aligned and all
attaching hardware and brackets are tight
and not worn. Tighten or replace.
Worn fan motor bearings.
Check motor for loss of lubricant or worn
bearings. Replace if necessary.
Compressor mounting grommets worn or
missing. Mounting hardware loose or
missing.
Tighten hardware. Replace grommets if
necessary.
Free or loose parts causing or allowing
noise during operation.
Inspect unit for parts that may have worked
free or loose or missing screws. Repair as
required.
Frost or ice on evaporator.
Defrost thermostat faulty.
Check defrost thermostat. Closes at
-10
O
C / 14
O
F. Replace if failed.
Evaporator fan faulty.
Check fan motor. Replace if failed.
Defrost heater remains open.
Check defrost heater continuity. Replace if
failed.
Defrost control faulty.
Check control and replace if failed.
Open wire or connector.
Check wiring and connections. Repair as
necessary.
Refrigerant shortage or restriction.
Check for leak or restriction. Repair,
evacuate and recharge system.
Unit starts and stops frequently (cycles on
and off).
Loose wire or thermostat connections.
Check wiring and connections. Repair as
necessary.
Supply voltage out of specification.
Check input voltage. Correct any supply
problems.
Overload protector open.
Check overload protector for continuity. If
open, replace overload.
NOTE: Ensure overload/compressor are
below trip temperature before testing.
Faulty compressor motor capacitor (some
compressors do not require motor
capacitor).
Check capacitor for open/short. Replace if
necessary.
NOTE: Discharge capacitor before testing.
Faulty fan motor.
Check fan motor. Replace if failed.
Restricted air flow.
Check condenser and grille for dirt. Clean.
Refrigerant shortage or restriction.
Check for leak or restriction. Repair,
evacuate and recharge system.
Compressor hot.
Check compressor current draw.
Summary of Contents for RX256DT4X1
Page 11: ...321023 11 2 3 Refrigerant Flow...
Page 12: ...321023 12 2 4 Cabinet Air Flow...
Page 13: ...321023 13 2 5 Ice And Water Dispenser Diagram...
Page 14: ...321023 14 2 6 Water Valve Diagram...
Page 15: ...321023 15 2 7 Typical External Sweat Pattern...
Page 16: ...321023 16 3 INSTALLATION...
Page 17: ...321023 17...
Page 18: ...321023 18...
Page 76: ...321023 76 Ice Water Dispensing Board...
Page 78: ...321023 78 Mid Electronic Specification Control RX256DT4X1 RX256ET2B1 RX256ET2W1...
Page 104: ...321023 104 14 WIRING DIAGRAMS 14 1 Wiring Schematic RX256DT7X1...
Page 105: ...321023 105 14 2 Wiring Diagram RX256DT7X1...
Page 106: ...321023 106 14 3 Wiring Schematic RX256DT4X1 RX256ET2B1 RX256ET2W1...
Page 107: ...321023 107 14 4 Wiring Diagram RX256DT4X1 RX256ET2B1 RX256ET2W1...
Page 108: ...321023 108 NOTES...
