Column Refrigeration Service Manual
14
3.1 Refrigeration System (cont.)
Table 3.1. Refrigeration System Diagnostics/Troubleshooting
PROBLEM
CAUSE
SOLUTION
Not Cooling (cont.)
Inverter
Loose Connection
Check Connections
Power
Ensure 120 power to inverter continuously
Signal Circuit Power
Ensure Signal Circuit has power
Compressor
Open Windings
Check continuity between pins
Locked Rotor
Verify locked rotor
Internal Damage
Verify Amperage
Refrigerant
Leak
Refrigerant Circuit
Restriction
Replace Refrigeration Module
Hot Gas Bypass Valve
Internal Leak
Check Valve
Damper
Obstructed
Remove Obstruction
Power
Determine if damper is getting power
Defective
Replace
Thermistors
Loose Connection
Verify Continuity
Defective
Verify Component Specifications
Temp/Humidity Sensor
Defective
Verify Component Specifications
Loose Connection
Verify Continuity
Control Board
Loose Connection
Verify Continuity
Defective
Verify Component Specifications
User Interface
Loose Connection
Verify Continuity
Defective
Verify Component Specifications