Quick diagnosis
What this code is telling you
Most likely trigger
Defective temp sensor probe
Recommended replacement
Oven Temp Sensor Probe
Diagnostic path
4 ordered checks
Part fit
Exact model number required
Safety first
Before opening the appliance
Unplug the appliance before removing panels or testing internal components. Do not bypass safety switches or live-test high-voltage, gas, refrigerant, or combustion components unless you are qualified to do so.
Read the full safety disclaimerRoot cause
Why the control reported this error
The cooking control displays this code when it detects an abnormal temperature, control, lock, or power condition. Verify defective temp sensor probe first, then inspect for wire harness shorted to chassis ground and faulty main PCB before replacing oven Temp Sensor Probe.
Symptoms
What you may notice
- ✓Oven will not begin preheating
- ✓Beeping sound plays
- ✓C-20 displayed on digit screen
Possible causes
Check the most likely causes first
- 1
Defective temp sensor probe
Start here when it matches your symptoms.
- 2
Wire harness shorted to chassis ground
- 3
Faulty main PCB
Diagnostic sequence
Work through these checks in order
Stop when you find the fault. Do not perform a step that requires skills or live testing you are not qualified to do.
- 1
Check 1
Shut off breaker to oven line.
- 2
Check 2
Unplug sensor inside upper rear cavity wall.
- 3
Check 3
Disconnect electrical power before opening panels. Measure probe resistance (standard ~1,080 ohms at 70°F).
- 4
Check 4
Replace oven temperature sensor probe.
Replacement part reference
Oven Temp Sensor Probe
Exact OEM part number
Model number required
Fitment note
The exact OEM part number varies by model and production revision. Verify the complete model number before ordering.
Verify the appliance model before ordering.
Manufacturers can use different parts under the same error code across model families and production revisions.
Where do I find my model number? →FixCodeDB may earn a commission from qualifying purchases made through affiliate links.
Common questions
Quick answers for this fault
What should I check first for C-20?
Start with defective temp sensor probe. If that checks out, continue through the diagnostic sequence above rather than replacing a part based on the code alone.
Does C-20 always mean Oven Temp Sensor Probe is bad?
No. An error code identifies the condition the control detected, not a guaranteed failed part. Confirm the likely causes and wiring first. The exact OEM part number varies by model and production revision. Verify the complete model number before ordering.
When should I stop troubleshooting C-20 myself?
Stop if the next step requires live electrical testing, sealed-system work, gas or combustion service, or any procedure outside your training. Unplug the appliance before removing panels or testing internal components. Do not bypass safety switches or live-test high-voltage, gas, refrigerant, or combustion components unless you are qualified to do so.
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