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When to adjust defrost settings

This article provides quick guidance for field teams on when to adjust defrost settings in a cooler when there is visible ice build-up, reduced cooling performance, or inefficient operation—while understanding the trade-offs between effective defrosting, energy use, and temperature stability.

 

Overview

Defrost settings serviceAdjust defrost settings when there are clear signs of ice build-up or inefficient cooling, such as:

  • Ice forming on coils or inside the cabinet

  • Poor cooling performance

  • Excessive energy use

Start with default settings. Only adjust when there is a consistent issue and monitor results.

Common scenarios

Issue Possible cause
  • Ice build-up in the unit
  • Frost or ice on evaporator or surfaces
 Defrost may be too infrequent or too short

  • Poor cooling performance

  • Unit struggles to reach setpoint

 Ice may be reducing airflow
  • Over-defrosting (too warm during cycles)
  • Temperature spikes during defrost
 Defrost may be too frequent or too long
  • High energy usage
  • Frequent or extended defrost cycles
 Defrost settings may be excessive

When NOT to adjust

Do not adjust defrost settings if:

  • The issue is temporary (e.g. recent door usage changes)
  • The cause may be:
    • Blocked airflow
    • Door seals or usage
    • Ambient conditions
    • Hardware faults

What you can adjust

  • Defrost frequency – how often defrost cycles run

  • Defrost duration – how long each cycle lasts

  • Defrost termination conditions (if applicable)

Adjust defrost parameters in small steps using Field app and monitor results. See also: Cancel defrost on a cooler with an installed SCS 500/600 Controller 

Comparison: What happens when you adjust the defrost settings?

Adjustment What improves Trade-offs to consider
Increase defrost frequency
  • Reduces ice build-up
  • Improves airflow
  • Higher energy use
  • More temperature disruption
Decrease defrost frequency
  • Lower energy use
  • More stable temperatures
  • Risk of ice build-up
  • Reduced cooling efficiency
Increase defrost duration
  • More complete ice removal
  • Longer temperature rise
  • Higher energy use
Decrease defrost duration
  • Shorter temperature impact
  • Less energy use
  • Risk of incomplete defrost
  • Ice accumulation over time

 

Specific guidance by Role type

Role Suggested actions
Service Technician

Adjust defrost settings when:

  • Ice build-up is visible or recurring
  • Cooling is impacted by airflow restrictions

Good practice:

  • Confirm ice is the root cause (not airflow or hardware)
  • Adjust one setting at a time
  • Review performance after several cycles
Installer
  • Use default defrost settings at install
  • Do not adjust to compensate for:
    • Poor airflow
    • Incorrect installation
    • Blocked vents
Site Manager / Fleet Manager

Defrost setting changes are normally made by a service technician but talk to your Customer Success Manager if you are interested in remote features that can be managed by connection to the AoFrio iQ platform.

Ask your service team to review a cooler's defrost settings if:

  • Ice build-up is visible
  • Cooling performance is inconsistent
  • Energy usage appears higher than expected