Column Refrigeration Service Manual
15
3.1 Refrigeration System (cont.)
Table 3.1. Refrigeration System Diagnostics/Troubleshooting
PROBLEM
CAUSE
SOLUTION
Evaporator Frozen
Air Infiltration
Access Hole
Ensure access hole is sealed
with permagum
Module to Cabinet Seal
Check for leaks between the refrigeration
module and cabinet
Door Left Open
Ensure door closes properly
(hinges activated)
Door Gasket Seal
Ensure door gasket integrity and it is
installed properly
Reed Switch Wire Hole
Ensure reed switch wire hole is sealed
with permagum
Thermistors
Loose Connection
Verify Continuity
Defective
Verify Component Specifications
Temp/Humidity Sensor
Defective
Verify Component Specifications
Loose Connection
Verify Continuity
Evaporator
Dirty
Clean
Defective
Verify Component Specifications
Evaporator Fan Motor(s)
Fan Blades Binding
Remove Obstruction
Defective
Verify and Replace
Defrost Thermistor
Out of Position
Install in proper location
Loose Connection
Verify Continuity
Defective
Verify and Replace
Hot Gas Solenoid Valve (Freezer Only)
Valve Stuck
Verify and Replace Module
Coil Open
Verify and Replace