Refrigerator Icing Up or Not Cooling? Defrost Timer 5304526183 – Fix Frost Buildup Fast

Excessive frost buildup in a Frigidaire refrigerator is almost always caused by a failed defrost timer — and it only gets worse until the part is replaced. In most Frigidaire and Electrolux top-freezer refrigerators, the defrost timer controls when the heater activates to melt accumulated frost off the evaporator coils. When it fails, the defrost cycle never initiates — frost builds up on the coils, airflow is blocked, and the refrigerator gradually loses its ability to cool the fresh food section. ⚡ Common failure point in Frigidaire FFTR and LFTR series refrigerators. Part 5304526183 is the genuine OEM replacement that restores the automatic defrost cycle and prevents frost from accumulating on the evaporator coils.

❓ Is This the Right Part?

This is the correct fix if ALL of the following are true:

• ✔ Your refrigerator powers on — compressor and fans are running
• ✔ The freezer section is cold but the fresh food section is warming up
• ✔ You can see or feel heavy frost buildup on the back wall of the freezer compartment
• ✔ The defrost heater and thermostat have been confirmed functional (or are being replaced together)
• ✔ ONLY problem is frost accumulation / reduced cooling — not a complete power failure

Not sure? Send us your model number — we'll confirm before you order.

🔧 Common Symptoms

• Heavy frost or ice buildup on the back wall of the freezer
• Fresh food section warming up while freezer stays cold
• Refrigerator running constantly but not reaching set temperature
• Evaporator fan blocked by ice — reduced or no airflow into fresh food section
• Defrost drain freezing over and water pooling under the crisper drawers
• Refrigerator cools normally after manually defrosting, then problem returns within days

✔ If these symptoms match, the defrost timer is the most likely failed component in the system.

✔ In most cases, replacing this defrost timer restores the automatic defrost cycle immediately and prevents frost from returning.

📦 Part Details

• Part Number: 5304526183
• Type: Mechanical Defrost Timer — 6-Hour Cycle (Controls defrost heater activation)
• Replaces: Direct OEM replacement — no modification required
• Brands: Frigidaire, Electrolux

⚙️ Installation Notes

Skill Level: Easy to Moderate — 20 to 45 minutes. Disconnect power before servicing. The defrost timer is typically located in the control housing at the top interior of the refrigerator compartment — remove the control panel cover to access it. Disconnect the wire harness, note the cam position on the old timer, swap in the new unit at the same cam position, and reconnect the harness. Manually advance the cam clockwise until it clicks to initiate a test defrost cycle before closing the panel.

💡 Pro Tip

✓ Model-Specific Repair Pages