Frigidaire Dehumidifier: frosting

Professional Repair Guide

What is this symptom?

Experiencing frost buildup on your Frigidaire dehumidifier? This issue typically arises during normal operation, especially in cooler temperatures or with restricted airflow. The frost or ice on the evaporator coils can significantly hinder water collection and efficiency, possibly triggering the unit's frost sensor to activate defrost cycles. Understanding the underlying causes can help you restore optimal performance.

Urgency: Medium

Important Tips for Frigidaire Models

  • Units have a frost sensor that will shut off the compressor when frost is detected; ensure correct settings and proper clearance.

Possible Causes

Low ambient temperature

How to Identify: Frost appears when the unit operates in rooms below approx. 41°F–65°F; frost clears when moved to a warmer space. (

Part: Evaporator coils / operating environment

Restricted airflow due to dirty or clogged filter

How to Identify: Airflow seems weak; filter visibly dirty or dusty and frost builds despite moderate room temperature. turn0(

Part: Air filter / airflow pathway

Fan or blower malfunction

How to Identify: Little or no air movement from vents; fan blade free spin blocked or irregular; frost even when filter clean. (

Part: Fan motor / blower wheel

Faulty humidistat or sensor

How to Identify: Unit runs longer than expected; humidity readings inconsistent; frost forms even at appropriate ambient temperatures. turn0(

Part: Humidity sensor / control board

Improper placement (close to walls/obstructions)

How to Identify: Unit placed against wall or obstructed; airflow limited; frost formation reduces when repositioned. (

Part: Installation environment

DIY Solutions

Relocate unit to warmer area

Easy 5–10 minutes
  1. Turn off and unplug the dehumidifier.
  2. Move the dehumidifier to a warmer part of the home.
  3. Restart the unit and monitor for frosting.
⚠️ Safety First: Do not place near heaters or flammable sources.

Clean or replace air filter

Easy 10–15 minutes
Tools Needed: soft brush or water for washable filter
  1. Turn off and unplug the unit.
  2. Open the filter compartment and remove the air filter.
  3. Clean the filter by rinsing with water or brushing off dust; let fully dry.
  4. Reinstall filter and restart unit.

Improve placement for airflow

Easy 5–10 minutes
  1. Ensure unit has at least 1 foot clearance on all sides.
  2. Remove nearby obstructions blocking intake/exhaust.
  3. Restart and check for reduced frosting.

Professional Repairs

Replace fan motor or blower wheel

Estimated Cost: $50 - $150

Replace humidistat or humidity sensor

Estimated Cost: $40 - $120

When to Call a Professional

Fan does not run after cleaning and inspection
Electrical smells or sparks when operating
Sensor replacement needed and user uncomfortable with internal repair

Preventive Maintenance

  • Clean air filter: Airflow restriction and coil frost buildup
    Frequency: monthly
  • Ensure adequate clearance around unit: Obstructed airflow and icing issues
    Frequency: each time you set up the unit

Frequently Asked Questions

Why is my Frigidaire Dehumidifier frosting?
Frosting is often caused by low ambient temperatures, restricted airflow due to a dirty filter, or fan issues.
How do I fix Frigidaire Dehumidifier frosting myself?
You can relocate the unit to a warmer area, clean or replace the air filter, and ensure proper placement for airflow.
How much does it cost to fix frosting?
Professional repairs for frosting can range from $40 to $150, depending on whether you need to replace a fan motor or humidistat.
When should I call a technician for frosting?
Call a technician if DIY solutions don't resolve the issue, particularly if fan or sensor replacements may be needed.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

75%
DIY Success Rate Difficulty: Either

Common Issues Reported by Users

  • Low ambient temperature causing the coils to freeze
  • Dirty or clogged air filter restricting airflow
  • Refrigerant leak leading to low refrigerant levels

User Suggested Solutions

  1. Increase the ambient temperature by moving the dehumidifier to a warmer location or increasing the room temperature. Allow the unit to thaw completely before restarting.

  2. Check and replace the air filter if it is dirty or clogged. Clean the filter regularly to ensure proper airflow.

  3. Inspect for refrigerant leaks. If a leak is found, contact a professional technician to recharge the refrigerant and repair the leak.

Analysis based on 1 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. My frigidaire dehumidifier got frost below one year

Community Discussions

frost formation on coils

Unit needs to be replaced after testing.

Pro needed View on Reddit →

Source: Reddit r/appliancerepair

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