Sub-Zero error code · 10 r 01
Sub-Zero Code 10 r 01: Refrigerator Evaporator Thermistor Shorted
Sub-Zero code 10 r 01 means the refrigerator evaporator thermistor reads shorted. Verify the sensor ohms and replace the fridge evaporator thermistor to.
Sub-Zero code 10 r 01 means the refrigerator evaporator thermistor is reading shorted, so the control board loses the coil temperature it uses to regulate fresh-food cooling and defrost. The fix is to confirm the thermistor's resistance is out of spec and replace the refrigerator evaporator thermistor.
What 10 r 01 means
This BI code indicates the refrigerator evaporator (coil) temperature sensor has a shorted circuit. The board uses this thermistor to monitor the fresh-food coil and manage cooling and defrost timing; a short produces an invalid low resistance, so the board flags the sensor and turns on the SERVICE light. Without it, refrigerator cooling and defrost control are compromised.
Severity:Service recommended · Service light:ON
Why 10 r 01 happens
The refrigerator evaporator sensor sits in a cold, frost-prone location, so it commonly shorts when defrost meltwater 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 can also produce a short.
Common causes
- Refrigerator 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
- Frost or ice buildup on the refrigerator evaporator coil
- Fresh-food section running too warm or too cold
- Defrost cycles seeming too long, too short, or absent
- Compressor cycling abnormally
Parts involved in 10 r 01
- Refrigerator 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 refrigerator and note its extent
- Confirm the door seals fully and interior vents are not blocked
- Note whether the SERVICE light and code return after the power cycle
When to book a pro
The evaporator sensor sits behind the refrigerator 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 r 01 FAQ
What does Sub-Zero code 10 r 01 mean?
Code 10 r 01 means the refrigerator evaporator (coil) thermistor is reading shorted. The board uses that fresh-food coil sensor to manage refrigerator cooling and defrost timing. A short pulls its resistance to an invalid low value, so the board flags the sensor and lights SERVICE. The r in the middle is what marks this as the refrigerator evaporator coil sensor, not the fridge cabinet sensor (10 1) or the freezer coil (10 F).
Can I fix a 10 r 01 myself?
Owner-safe steps are limited: power-cycle at the breaker, look for visible frost or ice buildup in the refrigerator and note its extent, and confirm the door seals fully and interior vents aren't blocked. The evaporator sensor sits behind the refrigerator rear panel, often under 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 r 01 code?
A breaker power cycle clears the SERVICE light, but a genuinely shorted refrigerator 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 ice on the fresh-food coil points toward a defrost-timing problem tied to this sensor.
Is it safe to keep using the fridge with 10 r 01?
It's medium severity. The fridge may keep running, but with no trusted coil reading the board can't manage fresh-food cooling or defrost timing correctly, so you can get frost on the evaporator, a fresh-food section that runs too warm or too cold, and abnormal compressor cycling. Ice buildup can eventually choke airflow and degrade cooling, so service it promptly and protect perishable food in the meantime.
What part fails in 10 r 01 and what does it cost?
The part is the refrigerator 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 a price blind.
How is 10 r 01 different from the freezer evaporator code 10 F 01?
They're the same type of fault, a shorted evaporator coil sensor, but on different coils. 10 r 01 is the refrigerator (fresh-food) evaporator, so its symptoms show up in the fresh-food section and on the fridge coil. 10 F 01 is the freezer evaporator. The middle character, r versus F, is the only thing distinguishing them, and it tells the technician which coil to access behind which rear panel. A pro confirms 10 r 01 by reading the fridge coil sensor's ohms against the coil temperature.
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