Perlick CR30R Series Service Manual page 16

3.1 Refrigeration System (cont.)
PROBLEM
Compartment Not
Holding Temperature
PROBLEM
Noisy Operation
16
CAUSE
Check Setpoints
Incorrect Setpoint
Thermistors
Loose Connection
Defective
Temp/Humidity Sensor
Defective
Loose Connection
Damper
Obstructed
Power
Defective
Obstructed Airflow
Check airflow inlet and outlet
for obstructions
CAUSE
Airflow Noise
Condenser Fan Motors
Evaporator Fan Motors
Clicking/Crackling During Defrost
Solenoid Valve
Frost/Ice Melting
Metallic Noises
Tubes
Sheet metal vibration
Compressor Noise
Normal Operation
Table 3.1. Refrigeration System Diagnostics/Troubleshooting
Column Refrigeration Service Manual
SOLUTION
Adjust Setpoint
Verify Continuity
Verify Component Specifications
Verify Component Specifications
Verify Continuity
Remove Obstruction
Determine if damper is getting power
Replace
Remove Obstruction
SOLUTION
Airflow noise from the condenser fans
is normal
Airflow noise from the evaporator fans
is normal
Normal during defrost
Normal during defrost
Isolate the tubes from surroundings
Isolate the parts to prevent vibration
Some noise is normal from a
refrigeration compressor
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