Refrigeration - System Troubleshooting

SKU: C-840Duration: 32 Minutes

Pay-per-view (PPV) format perfect for individual users.

Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.

Language:  English

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Heating and Cooling Systems Series (Details)
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Industrial Maintenance Library (Details)
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Course Details


Training Time: 32 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

To effectively troubleshoot a refrigeration system, you should understand how the system is supposed to function and be able to compare its current operation with its "normal" operation. Diagnostic charts, maintenance and operations logs, and wiring schematics can all help determine the cause when problems arise. Performing regular inspections and maintenance can help prevent many problems from occurring in the first place.

Learning Objectives

At the end of this module, you will be able to:

  • List the steps involved in troubleshooting a refrigeration unit or system
  • Describe the following troubleshooting tools: diagnostic charts, maintenance and operations logs, and wiring schematics
  • Identify possible causes for a compressor that won't start, runs continuously, turns on and off quickly, or is unusually noisy
  • List troubleshooting tips for walk-in units, glass door reach-in units, and single-door refrigerators
  • List inspection and maintenance activities that should be performed on a regular basis

Key Questions

The following key questions are answered in this module:

Why is it important to keep operating and maintenance logs for refrigeration systems?
When a problem arises, these logs can help pinpoint when a problem first appeared and reveal all of its effects. They also help ensure inspection and maintenance activities are performed regularly.

What kinds of troubleshooting tools are available?
Equipment manuals, wiring and control schematics, operations and maintenance logs, and system diagnostic charts can all help.

If the compressor won't start and there is no "hum," what does this mean?
Power might not be getting to the motor or starter, or a control circuit might be open.

If the compressor won't start but the motor hums, what could be the problem?
The compressor might be seized, the motor might be shorted, there could be a power supply problem, or the compressor might not have unloaded.

If the compressor starts but cuts out right away, or if it starts and stops continuously, what does this mean?
There are many possible reasons for this, including a low load, oversized system, faulty thermostat, plugged filter, or low refrigerant charge, among others.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

Some common problems with refrigeration systems include: • Compressor won't start • Compressor starts but then stops immediately • Compressor starts and stops frequently (referred to as "short cycling") • Compressor runs continuously • System runs but doesn't provide adequate cooling • System is noisy • Evaporator is heavily iced • Compressor discharge temperature is high • High power consumption It is beyond the scope of this module to cover all of these problems and their possible causes. The next section will discuss some possible causes for some of the more common problems.

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