Sub-Zero error code · 10 F 01
Sub-Zero Code 10 F 01: Freezer Evaporator Thermistor Shorted
Sub-Zero code 10 F 01 means the freezer evaporator thermistor reads shorted. Verify the sensor ohms and replace the freezer evaporator thermistor to restore.
Sub-Zero code 10 F 01 means the freezer evaporator thermistor is reading shorted, so the control board loses the coil temperature it uses to manage cooling and defrost. The fix is to confirm the thermistor's resistance is out of spec and replace the freezer evaporator thermistor.
What 10 F 01 means
This BI code indicates the freezer evaporator (coil) temperature sensor has a shorted circuit. The board relies on this thermistor to know how cold the freezer coil is and to time defrost termination; a short produces an invalid low resistance, so the board flags the sensor and lights the SERVICE indicator. Without it, defrost timing and freezer cooling control are compromised.
Severity:Service recommended · Service light:ON
Why 10 F 01 happens
The evaporator sensor sits in a cold, frost-prone location, so it commonly shorts when meltwater during defrost bridges its leads or when frost-and-thaw cycling degrades the insulation. Internal element failure after years of cold cycling, a chafed harness, or corroded connector terminals also produce a short.
Common causes
- Freezer evaporator thermistor failed internally (shorted element)
- Defrost meltwater bridging the sensor leads
- Frost-and-thaw cycling degrading the sensor insulation
- Chafed or pinched harness shorting conductors
- Corroded connector at the control board
What you'll typically see
- SERVICE light is on at the control panel
- Heavy frost or ice buildup on the freezer evaporator coil
- Freezer not holding temperature or running too cold
- Defrost cycles seeming too long, too short, or absent
- Compressor cycling abnormally
Parts involved in 10 F 01
- Freezer evaporator thermistor — Replace when measured ohms are out of spec versus the coil temperature (shorted/low resistance)
- Sensor wiring harness or connector — Replace or repair only if the short is in the wiring rather than the thermistor
What you can check yourself
- Record the code, then power-cycle the unit at the breaker for 1-2 minutes
- Look for visible frost buildup in the freezer and note its extent
- Confirm the freezer door seals fully and vents are not blocked
- Note whether the SERVICE light and code return after the power cycle
When to book a pro
The evaporator sensor is behind the freezer rear panel, often under frost, and confirming a shorted reading requires ohm testing. A technician must access the coil safely and verify sensor versus harness before replacement.
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Frequently asked
10 F 01 FAQ
What does Sub-Zero code 10 F 01 mean?
Code 10 F 01 means the freezer evaporator (coil) thermistor is reading shorted. The board uses that coil sensor to know how cold the freezer evaporator is and to time defrost termination. A short pulls its resistance to an invalid low value, so the board flags the sensor and lights SERVICE. The F in the middle is what marks this as the freezer evaporator coil sensor, not the freezer cabinet sensor (which would be 10 2) or the fridge coil (10 r).
Can I fix a 10 F 01 myself?
Owner-safe steps are limited: power-cycle at the breaker, look for visible frost or ice buildup on the freezer coil and note how heavy it is, and confirm the door seals and that vents aren't blocked. The evaporator sensor sits behind the freezer rear panel, often buried in frost, so confirming the short requires ohm-testing and safe access to the coil. Leave that and the wiring to a technician.
How do I reset the 10 F 01 code?
A breaker power cycle clears the SERVICE light, but a genuinely shorted freezer evaporator thermistor is re-detected and the code returns. The real reset is correcting the fault, replacing the shorted coil sensor or repairing the harness if that's where the short is. Note whether the code returns and describe any frost buildup, since heavy ice on the coil points toward a defrost-timing problem driven by this sensor.
Is it safe to keep using the freezer with 10 F 01?
It's medium severity. The freezer may keep running, but with no trusted coil reading the board can't time defrost or control freezer cooling correctly, so you can get heavy frost on the evaporator, a freezer that won't hold temperature, and abnormal compressor cycling. Left alone, ice buildup can choke airflow and worsen cooling, so service it promptly and protect anything you can't risk thawing.
What part fails in 10 F 01 and what does it cost?
The part is the freezer evaporator thermistor; the short is sometimes in its wiring harness or connector instead. Our flat $89 diagnostic confirms sensor versus harness with a meter before replacement, and the repair carries a 365-day warranty. Call (650) 668-1554 to schedule. We confirm the failed part first rather than quoting blind.
How is 10 F 01 different from the freezer cabinet code 10 2 01?
Both are freezer-side shorted-thermistor codes, but they're different sensors. 10 F 01 is the freezer evaporator coil sensor, which the board uses for defrost timing, so its classic symptom is heavy frost or ice on the coil and erratic defrost cycles. 10 2 01 is the freezer cabinet (air) sensor that regulates the compartment temperature. That defrost connection, and the frost-prone, meltwater-bridged location behind the rear panel, is what makes 10 F 01 distinct. A technician confirms it by reading the coil sensor's ohms against the coil temperature.
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