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Thermador·Oven / Rangehigh severity
Thermador Oven / Range Error Code F3
Oven temperature sensor open circuit
Common Causes
- 1RTD probe failed open
- 2Sensor connector unseated at the rear
- 3Sensor lead broken from heat fatigue
Step-by-Step Troubleshooting
- 1
Disconnect power and locate the RTD probe threaded through the rear wall of the Thermador oven cavity
- 2
Unplug the sensor at the board connector and read its resistance, expecting roughly eleven hundred ohms at room temperature
- 3
An infinite or over-limit reading confirms an open probe that must be replaced as an assembly
- 4
Trace the sensor lead from the cavity to the board for a pinch point or heat-cracked insulation that would break the circuit
Pro Diagnostic Tip
The Thermador RTD climbs in resistance as it heats, so a probe that reads correctly cold but fails once the oven is hot is cracking internally — replace it even when the room-temperature check passes.
You Might Also Notice
- •Oven will not heat at all
- •Display shows an implausibly low temperature
- •Fault appears the moment bake is selected
- •Oven worked yesterday and is dead today
Parts, Cost & Difficulty
Repair Difficulty
Moderate — Some Experience NeededEstimated Repair Cost
$120–$260
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
Oven temperature sensor (RTD probe)Sensor wiring harness
Do You Have the Right Tools?
Combustion analyzer ($300), igniter tester ($120), temperature calibrator ($150), and gas pressure manometer. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
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Gas ovens involve live gas lines — a loose connection creates explosion and carbon monoxide risk. Electric ovens run on 240V circuits. Our techs are licensed and insured — let them handle the risk.
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Get Professional Help Now
Error code F3 is a high-severity issue that can cause further damage to your oven / range if left unresolved. A licensed technician can diagnose and fix it the same day.
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Frequently Asked Questions
What does Thermador error code F3 mean?
Thermador error code F3 indicates: Oven temperature sensor open circuit. This is a high-severity issue affecting your oven / range.
How do I fix Thermador error code F3?
Disconnect power and locate the RTD probe threaded through the rear wall of the Thermador oven cavity Then, Unplug the sensor at the board connector and read its resistance, expecting roughly eleven hundred ohms at room temperature Then, An infinite or over-limit reading confirms an open probe that must be replaced as an assembly There are 1 more steps — see the full troubleshooting guide above. This repair typically requires professional tools and expertise.
How do I know if my oven / range has error F3?
Besides the error code on the display, common signs include: Oven will not heat at all; Display shows an implausibly low temperature; Fault appears the moment bake is selected. If you notice any of these symptoms, check your oven / range's display panel for error code F3.
How much does it cost to fix Thermador F3?
Repair costs for Thermador F3 typically range from $120 to $260 depending on the specific cause and parts needed. EasyBear offers free diagnosis when you proceed with the repair. Call (415) 795-7300 for a same-day appointment.
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