KitchenAid Refrigerator CO Error: Condenser Fan Fault
What Does KitchenAid Refrigerator Error Code CO Mean? CO on a KitchenAid refrigerator signals a Condenser Fan fault. The condenser fan at the base of the unit draws ambient air across the condenser coil to reject heat from the refrigeration cycle. When the control board detects that fan speed is below threshold — or that […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. A CO fault left unaddressed will cause the compressor to overheat and potentially trigger its internal thermal overload, leading to complete cooling loss. The refrigerator should not be relied upon for food storage until the condenser fan is repaired.
Can I reset the code?
No. CO is a live operating fault. A reset may clear the code temporarily if the fan motor had tripped its thermal overload, but a failed motor or blocked coil will cause CO to return immediately once the board confirms fan speed.
When to stop immediately?
Stop if you notice: Compressor exterior is hot enough to cause discomfort when touched, Both compartments exceed safe temperatures within 6 hours of CO appearing.
Symptoms You May Notice
Refrigerator exterior feels unusually hot along the bottom and sides
The condenser coil retains heat that the fan would normally dissipate, causing the bottom grill area and adjacent cabinet panels to become uncomfortably warm or hot to the touch.
Compressor runs continuously without cycling off
Because heat is not being rejected efficiently, the compressor struggles to bring the refrigerant to condensing temperature and runs in an extended on-cycle — often indefinitely — instead of the normal 50–60% duty cycle.
Both compartments slowly warm over 12–24 hours despite compressor running
An overloaded compressor that cannot condense refrigerant properly delivers less cooling capacity per cycle, causing gradual compartment temperature rise even though the compressor sounds active.
Possible Causes
Failed condenser fan motor
The fan motor at the base rear of the refrigerator has burned out or seized, stopping the blade entirely and cutting off condenser airflow.
DIY PossibleCondenser coil severely blocked with dust and debris
Thick dust accumulation on the condenser coil acts as insulation, increasing the thermal load on the fan until the motor overheats and fails or trips its thermal overload.
DIY PossibleMain board condenser fan output circuit failed
The control board relay or driver that powers the condenser fan has failed, sending no voltage to a functional motor.
Requires ProfessionalSafe Checks You Can Do
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1
Clean the condenser coil and fan area
Remove the lower front grille (two retaining clips). Use a condenser brush or vacuum with a crevice tool to remove dust from the condenser coil and the condenser fan blade. Restore power and listen for the fan to start within two minutes.
KitchenAid recommends cleaning the condenser coil every 6–12 months. A heavily loaded coil can overheat the fan motor's thermal overload switch, which resets once the motor cools — allowing the fan to restart after cleaning.
Tools required -
2
Verify fan blade spins freely by hand
With the power OFF at the breaker, reach behind the lower grille opening and attempt to spin the condenser fan blade by hand. It should rotate smoothly and freely with minimal resistance. A stiff or completely seized blade indicates a motor bearing failure.
Even if the blade spins freely, a motor with failed windings will not start under power — a freely spinning shaft rules out mechanical seizure but does not confirm the motor is electrically healthy.
When to Call a Professional
Contact a qualified technician if:
- Fan motor draws no current and shaft is seized
- Board output voltage at fan connector is present but fan does not start
- Compressor has tripped its thermal overload and will not restart
Need Professional Help?
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