Sub-Zero error code · 20 2 07
Sub-Zero Code 20 2 07: Defrost Bi-Metal Error
Sub-Zero Code 20 2 07 is a defrost bi-metal error. Check the bi-metal ohms and replace the defrost heater if necessary to restore defrost.
Sub-Zero Code 20 2 07 is a defrost bi-metal error, meaning the bi-metal that terminates the defrost cycle is reading out of range. The fix is to check the bi-metal resistance (ohms) and replace the defrost heater if it tests faulty.
The meaning of 20 2 07
This code indicates the defrost bi-metal circuit is not behaving as expected, so the control flags a defrost bi-metal error. The bi-metal opens and closes to limit defrost heat and signal when the coil is clear of ice. When its measured resistance falls outside the normal range, the control can no longer trust it to manage the defrost cycle.
The part usually behind 20 2 07
- Defrost heater — Replace if the heater tests open or out of spec and is preventing the coil from clearing
- Defrost bi-metal (termination thermostat) — Replace if its measured ohms are out of range or it does not switch at the correct temperature
Root causes behind 20 2 07
An open or out-of-spec bi-metal can no longer make or break its circuit at the correct temperature. A failed defrost heater can leave ice on the coil so the bi-metal never reaches its set point, which the control logs as a bi-metal fault. Corroded terminals or a damaged harness can also push the measured ohms out of range.
Signs of 20 2 07
- Code 20 2 07 appears in the service menu
- Ice or frost remains on the evaporator after a defrost
- Freezer or refrigerator runs warmer than the set point
- Longer run times as the iced coil reduces airflow
- Defrost cycle does not appear to clear the coil
Most-likely causes
- Open or out-of-spec defrost bi-metal
- Failed defrost heater leaving ice on the coil
- Corroded or loose bi-metal terminals
- Damaged wiring between the bi-metal and control board
- Bi-metal clip not making good thermal contact
Safe owner checks
- Note whether frost is visibly building inside the freezer
- Confirm the door is sealing and not adding excess moisture
- Avoid blocking vents so the coil stays as clear as possible
- Record when the code appears to assist the technician
When professional service is needed
Measuring bi-metal and heater resistance requires accessing the evaporator and using a meter, and replacing the defrost heater involves discharging the cabinet and working near the sealed coil, which calls for a qualified technician.
Frequently asked
Common questions about Sub-Zero 20 2 07
What exactly does Sub-Zero code 20 2 07 mean?
Code 20 2 07 is a defrost bi-metal error. The defrost bi-metal (termination thermostat) is the small switch on the evaporator that limits defrost heat and tells the control when the coil is clear of ice. When the bi-metal's measured resistance reads outside its normal range, the control can no longer trust it to terminate the defrost cycle, so it logs 20 2 07.
Can I fix a 20 2 07 defrost bi-metal error myself?
No, this one is not an owner-level repair. Confirming the fault means metering the bi-metal and the defrost heater at the evaporator, which requires removing the rear coil cover and working near the sealed system. As an owner you can usefully note whether frost is building inside the freezer, keep the door sealing well, and avoid blocking the vents, then leave the ohm testing to a technician.
How do I clear or reset code 20 2 07?
You can power the unit off at the breaker for about a minute to clear the stored 20 2 07 from the display, but if the defrost bi-metal or heater is genuinely out of spec the code will return on the next defrost cycle. The code only stays cleared once the failed bi-metal or defrost heater is replaced and the coil defrosts properly again.
Is it safe to keep using the refrigerator with code 20 2 07 showing?
It is not an emergency, but it should not be ignored. With the bi-metal error the defrost cycle may not fully clear the evaporator, so ice builds on the coil, airflow drops, and the freezer or fresh-food section drifts above its set point. The longer it runs iced over, the longer the compressor works and the warmer your food gets, so plan service before performance degrades further.
Which part causes 20 2 07 and what will the repair cost?
The two parts in play are the defrost bi-metal (termination thermostat) and the defrost heater itself, since a dead heater can leave ice on the coil and mimic a bi-metal fault. We charge a flat $89 diagnostic to confirm which one is out of spec on the meter, and every repair is backed by a 365-day warranty. Call (650) 668-1554 to schedule.
How is 20 2 07 different from a straight defrost heater open code?
Code 20 2 07 specifically points at the bi-metal termination circuit reading out of range, whereas a heater-open code points at no continuity through the heater element. They overlap because a failed heater can keep the coil iced so the bi-metal never reaches its switching temperature. A technician confirms 20 2 07 by metering the bi-metal's ohms and verifying it switches at the correct temperature before deciding whether the bi-metal, the heater, or the wiring is at fault.
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