Affected model seriesFrench-door refrigerator service-diagnostic family
Quick answer
Upper AutoFill sensor error.
Model compatibility: GE reuses codes across series and model years, so 0721 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Upper AutoFill sensor error.
Signs
Symptoms you may notice
Operation may stop when the control sees an implausible reading.
The code can recur whenever the dispenser subsystem is used.
The code may return shortly after startup or during the affected cycle stage.
Temperature-related performance can become inconsistent.
Why it happens
Possible causes
A sensor or thermistor that has drifted outside its expected range.
A closed or restricted household water supply.
A dispenser control-board fault.
An open, shorted, corroded, or loose sensor connection.
A stuck paddle, key, or dispenser input.
Before you call
Safe checks you can make
These are simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
Confirm the household water valve is fully open.
Note whether the code appears immediately or only after heating/cooling begins; that timing is useful for diagnosis.
If the model uses removable inlet screens that the owner’s manual allows the user to inspect, check for obvious debris without dismantling the valve.
Confirm the water supply is open for flow/AutoFill faults.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your GE appliance?
Book a specialist visit for a clear estimate and approval before any repair.
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Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
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