Sub-Zero Refrigerator or Freezer Not Cooling
A Sub-Zero that's running warm usually isn't dead. On many built-in models the refrigerator and freezer each have their own cooling system, so one side can warm up while the other stays cold. Which side is warm, and whether you can hear the fans and compressor running, tells us a lot before we open anything.
What it usually is
Most common first.
- Condenser packed with dust
The condenser gets rid of the heat pulled out of the cabinet. When it's matted with dust and pet hair, the unit runs longer and longer and still can't keep up. It's where we start.
- Condenser fan or evaporator fan not running
One fan cools the condenser and compressor, the other moves cold air through the compartment. If either stops, temperatures climb slowly.
- Door not sealing
A torn or dirty gasket, or a heavy panel door that no longer pulls itself shut, lets warm, humid air in all day.
- Defrost problem
When the defrost system stops working, frost builds on the evaporator until air can't pass through it. Frost or ice on the back wall of the freezer is the usual sign.
- Control board or temperature sensor
A failed sensor or board can leave the compressor or fans without the signal to run.
- Sealed system leak or compressor failure
Less common, and the most involved repair. We confirm it with testing before recommending it.
What you can safely check yourself
- Make sure the unit has power and hasn't been switched off at its own control panel. Check the breaker too.
- Look at the set temperatures. The usual settings are 38 for the refrigerator and 0 for the freezer.
- Close each door and look along the gasket for gaps, tears, or food stuck to it. Wipe it down with warm soapy water.
- Make sure nothing inside is pushed up against the air vents.
- Clean the condenser if you can reach it. On many built-in models it sits behind the grille at the top, and on others it's behind the kickplate at the bottom. Switch the unit off first, then vacuum the fins gently with a soft brush. They're sharp and they bend easily.
- Give it a full day to recover before you judge the result.
Anything past this, like refrigerant, gas valves, wiring, or taking panels off, is a job for a technician.
When to call
- It's still warm a day after you cleaned the condenser.
- You hear a click every few minutes, or the unit is silent with no fans and no compressor hum.
- There's frost or ice on the back wall of the freezer.
- A Service indicator is on.
- Both the refrigerator and the freezer are warm.
Our Sub-Zero repairs in Tampa Bay
Documented repairs from local homes — what failed, how we found it, and how it was fixed.
Sub-Zero Refrigerator Leaking Water in Clearwater: Iced-Up Drain and a Hardened Door Gasket
Sub-Zero Refrigerator Not Cooling in Tarpon Springs: A Dead Condenser Fan
Sub-Zero Refrigerator Dispenser Turning On By Itself in Clearwater: Rats Got to the Cable
Sub-Zero Refrigerator Repair in Davis Islands, Tampa: Dead After a Lightning Strike
Sub-Zero Refrigerator Not Freezing in Tarpon Springs: A Failed Evaporator Fan
Sub-Zero Refrigerator Repair in Westchase: A Dispenser That Turns Itself On
Common questions
Why is my Sub-Zero freezer cold but the refrigerator warm?
On many built-in Sub-Zero models the two compartments are cooled separately, so one can fail while the other keeps working. A fan, a sensor, a defrost problem, or a sealed system fault on the warm side are the usual suspects, and it takes testing to tell them apart.
How often should a Sub-Zero condenser be cleaned?
Your owner's guide gives the interval for your model. In a home with pets or a lot of dust, look at it a couple of times a year and clean it when you can see a layer on the fins.
Who repairs a Sub-Zero that isn't cooling in Tampa Bay?
Artur Company, (727) 599-9631. We're an independent, owner-operated repair service based in Oldsmar, not affiliated with Sub-Zero, and we repair Sub-Zero built-ins in Tampa, Clearwater, Palm Harbor, and nearby communities.
This is general guidance and models differ, so your owner's manual comes first. Artur Company is an independent appliance repair service and is not affiliated with, authorized by, or endorsed by Sub-Zero Group, Inc. Sub-Zero is a trademark of its respective owner and is used here only to describe the appliances we repair.
Need your Sub-Zero looked at?
Call to talk through what's going on, or book a visit online.