dF Moderate Moderate DIY

Frigidaire Refrigerator dF — Defrost Mode / Defrost Fault

Frigidaire Refrigerator · Error code dF

What dF Means

Indicates the refrigerator is running a forced defrost cycle, or that the defrost cycle did not complete normally. Can be triggered by entering service mode or by repeated failed defrosts.

Symptoms

  • dF on display
  • No cooling for ~30 minutes
  • Freezer warming temporarily
  • Drip from drain pan

Common Causes

1
Normal defrost in progress

If entered service mode, dF appears intentionally.

2
Defrost heater failure

Heater not warming the coil during the cycle.

3
Defrost thermostat open

Bi-metal opened and never resets.

4
Wiring fault to heater

Burned connector at heater terminals.

How to Fix It

  1. If just entered, wait 30 minutes for defrost to finish.
  2. If dF persists or recurs, unplug refrigerator.
  3. Access evaporator and check for heavy frost (defrost not running) or melted condition.
  4. Test defrost heater for continuity — replace if open.
  5. Test defrost thermostat — should close cold; replace if open at room temp.
  6. Inspect wiring at heater terminals for burn marks.

Parts You May Need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Common replacement Defrost heater View on Amazon→ Common replacement Defrost thermostat View on Amazon→

More Frigidaire Refrigerator Codes

1F 1F — Ice Maker Fault 1 SH 1 SH — Fresh Food Sensor Shorted 1 SY 1 SY — Fresh Food Sensor Open 2 SH 2 SH — Freezer Sensor Shorted 3 SH 3 SH — Evaporator Sensor Shorted 3 SY 3 SY — Evaporator Sensor Open

All Frigidaire codes → All refrigerator codes →

Verified against manufacturer documentation: frigidaire.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.