Viking Oven F03 Error: Temperature sensor open circuit
What Does the Oven Error Code F03 Mean? The F03 error code on a Viking wall oven indicates an open circuit in the oven temperature sensor. The control board receives no signal from the RTD probe, which means the sensor wire is broken, the probe has failed, or the connector is disconnected. Without temperature feedback, […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Without temperature sensor feedback, the oven cannot safely regulate heat. Do not operate until the sensor circuit is restored.
Can I reset the code?
Yes. If the cause is a loose connector, reseating it and power cycling may fully resolve the error. For hardware failures, a reset will not help.
When to stop immediately?
Stop if you notice: RTD sensor tests open circuit (infinite resistance)., Wiring continuity test shows a break in the harness..
Symptoms You May Notice
Oven will not start a cycle
The control board refuses to begin heating because it has no temperature reference.
F03 displayed immediately
The error appears as soon as a bake or broil function is selected.
Oven heats without limit
Some boards default to continuous heating when sensor data is absent — a dangerous runaway risk.
Error follows a recent service
If the oven was recently serviced or moved, a disconnected sensor connector is a likely cause.
Possible Causes
Disconnected RTD sensor connector
The plug connecting the RTD sensor wiring to the control board has come loose, creating an open circuit.
DIY PossibleFailed (open) RTD probe
The sensing element inside the probe has broken, showing infinite resistance on a multimeter.
DIY PossibleBroken sensor wire in harness
A wire in the harness between sensor and board has broken, creating an open circuit even though the probe itself is fine.
Requires ProfessionalSafe Checks You Can Do
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1
Reseat the sensor connector
Disconnect power at the breaker. Locate the RTD sensor on the back wall of the oven cavity and trace its wire to the control board connector. Firmly unplug and replug the connector, ensuring it clicks into place.
Inspect for bent or corroded pins before reseating.
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2
Test sensor resistance
With power off, disconnect the sensor and test resistance across the probe terminals with a multimeter. At room temperature, expect 1,080–1,100 ohms. An open-circuit (OL) reading means the probe has failed.
If the sensor reads correctly but the error persists, the fault is in the wiring or control board.
Tools required -
3
Test wiring continuity
Using a multimeter in continuity mode, check each sensor wire from the probe connector to the board connector. A break will show no continuity and the wire or harness will need replacement.
Check for pinch points where the wire passes through the oven frame.
Tools required
When to Call a Professional
Contact a qualified technician if:
- RTD sensor probe replacement.
- Wiring harness replacement or repair.
- Control board sensor input diagnosis if sensor and wiring test good.
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