Refrigerator Freezer Not Freezing? Here’s Why (And What To Check)
Your freezer isn’t freezing. Maybe it’s warm while the fridge is still cold. Maybe both compartments are warm. Maybe the freezer is partially frozen but not cold enough. Maybe it runs constantly and never reaches temperature.
Here’s the thing most people get wrong: they assume the compressor has failed and start looking at replacement fridges. In reality, the most common freezer faults are airflow problems — a failed evaporator fan, a blocked vent, or a defrost system fault — and those are far cheaper to fix than a new fridge.
The good news is that the pattern of what’s cold and what isn’t tells you which part of the cooling chain has failed. A freezer that’s warm while the fridge is cold means cold is being produced but not delivered.
This page covers the common causes, the symptoms to look for, and the checks you can perform yourself. If you need the complete diagnostic sequence for determining whether the fault is the fan, the defrost system, the thermostat, or the compressor, the full guide is linked at the bottom.
Quick Diagnosis
Freezer warm, fridge cold: a failed evaporator fan, a blocked air vent, or a defrost system fault.
Both compartments warm: a compressor, condenser, or sealed system fault.
Freezer partially frozen: a defrost fault or a partial airflow blockage.
Freezer runs constantly but never freezes: a dirty condenser, a thermostat fault, or a refrigerant leak.
Freezer freezing but not cold enough: a failing compressor, low refrigerant, or an out-of-calibration thermostat.
Why Your Freezer Stops Freezing
A refrigerator freezer works by moving heat out of the freezer compartment and releasing it into the room. The chain has several components:
The compressor pumps refrigerant through the system
The condenser coils release heat into the room
The evaporator coil absorbs heat from the freezer
The evaporator fan circulates cold air
The thermostat controls the temperature
If any link fails, the freezer stops freezing. The symptom tells you which link has failed.
Common Causes
Failed Evaporator Fan
The most common cause of “freezer warm, fridge cold.” The fan circulates cold air through the freezer. When it fails, cold air is produced but doesn’t move.
Blocked Air Vent
The vents that carry cold air between compartments can be blocked by food packaging or frost.
Defrost System Fault
The defrost heater or thermostat has failed. Frost builds up on the evaporator coil, blocking airflow and insulating the coil.
Dirty Condenser Coils
The coils release heat into the room. When they’re packed with dust, the system can’t shed heat, and cooling suffers.
Failed Condenser Fan
The fan that pulls air across the condenser coils has failed. The coils overheat, and cooling drops.
Failed Thermostat
The thermostat controls the temperature. When it fails, the compressor may not run, or may run constantly.
Failed Compressor
The compressor pumps refrigerant. When it fails, no cooling happens.
Sealed System Leak
Refrigerant has leaked out. The system can’t cool without it.
Failed Door Seal
A damaged door seal lets warm air in. The freezer works harder and may not reach temperature.
Symptoms To Look For
The exact symptom tells you where the fault is.
Freezer Warm, Fridge Cold
Cold is being produced but not delivered. This points to an airflow problem — the evaporator fan, a blocked vent, or a defrost fault.
Both Compartments Warm
Cold isn’t being produced at all. This points to the compressor, condenser, or sealed system.
Freezer Partially Frozen
Some cold, not enough. This points to a defrost fault or a partial blockage.
Runs Constantly, Never Freezes
The system is trying but can’t reach temperature. This points to a dirty condenser, a thermostat fault, or a refrigerant leak.
How to Diagnose the Fault
Step 1 — Confirm Which Compartments Are Affected
Before checking anything, work out which compartment is warm:
Freezer warm, fridge cold — airflow problem
Both warm — cooling problem
Partially frozen — partial airflow or defrost fault
That single observation splits the diagnosis.
Step 2 — Listen for the Fans
Put your ear to the back of the fridge (condenser fan) and inside the freezer (evaporator fan). Both should be running when the compressor runs. Silence means a failed fan.
Step 3 — Check for Frost Buildup
Open the freezer and look at the back wall. A thick layer of frost means a defrost system fault.
Step 4 — Check the Air Vents
Look for the vents between compartments. Confirm they’re not blocked.
Step 5 — Clean the Condenser Coils
Pull the fridge out and inspect the coils. Clean them if they’re dusty.
Step 6 — Test the Thermostat
With the fridge unplugged, test the thermostat for continuity at different temperatures.
Step 7 — Test the Defrost System
Test the defrost heater and thermostat for continuity.
Step 8 — Test the Compressor
Test the windings for continuity. If you have a clamp meter, test the running current.
Fixing Specific Freezer Faults
Freezer Not Freezing But Fridge Is Cold
Airflow problem. Check the evaporator fan, the air vents, and the defrost system.
Freezer Not Freezing But Refrigerator Is Cold
Same fault, different phrasing. Check the evaporator fan first.
Freezer Not Freezing But Fridge Is Fine
Same as above. Airflow or defrost fault.
Both Freezer and Fridge Not Cooling
Cooling problem. Check the condenser coils, the condenser fan, and the compressor.
Freezer Runs Constantly
Dirty condenser, thermostat fault, or refrigerant leak. Clean the coils first.
Freezer Partially Frozen
Defrost fault or partial blockage. Check the defrost system.
Repair Cost Guide
Component DIY Part Cost Professional Fitted
Evaporator fan motor $40 to $120 $200 to $400
Defrost heater or thermostat $30 to $100 $200 to $400
Thermostat $20 to $60 $150 to $300
Condenser coil cleaning $0 $100 to $200
Door seal $30 to $80 $150 to $300
Start relay $20 to $60 $150 to $300
Compressor $150 to $400 $400 to $800
Sealed system repair — $500 to $1,200
When to Repair vs Bin
Repair if:
The fault is the evaporator fan, defrost system, thermostat, or dirty coils
The fridge is under eight years old
The repair cost is under half the cost of a new fridge
The fridge has no other faults
Bin if:
The compressor has failed on a fridge over eight years old
The fault is a sealed system leak
The fridge has multiple failed components
The repair cost exceeds half the cost of a new fridge
Safety Warning
Electrical risk. Refrigerators run on mains voltage. Unplug the appliance before removing any panel or accessing any component.
Cold risk. The freezer compartment is extremely cold. Wear gloves if you’re working inside it for extended periods.
Sharp edges. The evaporator coil and its associated components can be sharp. Handle with care.
Water risk. If your fridge uses a water supply line, shut off the water before disconnecting any line.
FAQ
Why is my freezer not freezing but the fridge is cold?
This points to an airflow problem. The evaporator fan has likely failed, or the defrost system has iced up the coil.
Why is my freezer not freezing and the fridge is warm too?
This points to a compressor, condenser, or sealed system fault. Check the condenser coils first — they’re the cheapest fix.
Why does my freezer run constantly but never freeze?
This points to a dirty condenser, a thermostat fault, or a refrigerant leak.
Why is my freezer partially frozen?
This points to a defrost fault or a partial airflow blockage.
Is it worth repairing a freezer that’s not freezing?
Usually yes, if the fault is the evaporator fan, defrost system, or thermostat. If the compressor or sealed system has failed, replacement is usually the better call.
Get the Complete Diagnosis
Need to determine exactly which component is causing the fault?
The complete diagnostic guide takes you beyond the basic checks and walks through the full cooling chain step by step.
The complete guide includes:
Evaporator fan testing with expected readings
Defrost system diagnosis
Thermostat testing
Condenser coil cleaning
Condenser fan testing
Door seal testing
Start relay testing
Compressor testing
Model-specific notes
Repair and replacement considerations
Repair-or-bin guidance
Refrigerator Freezer Not Freezing Repair Guide
Complete diagnostic guide for refrigerators with a freezer that isn’t freezing.
What’s included:
Diagnosis for all freezer faults
Step-by-step testing procedures
Evaporator fan and defrost system diagnosis
Thermostat and compressor testing
Required checks and tools
Repair information
Replacement considerations
Repair-or-bin guidance
Download instantly
$3.95
Have More Than One Refrigerator Problem?
If you’re dealing with several problems rather than just a freezer fault, the Refrigerator Not Cooling guide covers the most common cooling faults in one reference.
$7.95
Looking for Brand-Specific Guides?
Our brand guides cover washers, dryers, and dishwashers from Fisher & Paykel, Samsung, LG, Bosch, Whirlpool, Maytag, GE, and Miele.
$12.95
Repair or Bin?
Before spending money on a repair, find out what is actually wrong with your appliance.
Repair or Bin gives you the information to diagnose the problem and make an informed repair-or-bin decision.
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