Viking Range F03 Error: Temperature sensor open circuit
What Does the Range Error Code F03 Mean? The F03 error code on a Viking range indicates an open circuit in the oven temperature sensor. The control board cannot receive any temperature signal from the RTD probe, meaning the sensor wire is broken, disconnected, or the probe itself has failed. Without this signal, the oven […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Without a functioning temperature sensor, the oven cannot regulate heat and may overheat or fail to heat. Do not use until repaired.
Can I reset the code?
Yes. A power cycle may temporarily clear the display, but the fault will return on the next cook cycle if the sensor circuit remains open.
When to stop immediately?
Stop if you notice: The RTD sensor measures open circuit (infinite resistance) — sensor must be replaced., Wiring continuity tests reveal a break in the harness between the sensor and board..
Symptoms You May Notice
Oven will not heat
The oven fails to reach temperature because the board has no sensor feedback to confirm when to activate heating elements.
F03 error on display
The fault code appears immediately or shortly after attempting to start a bake or broil cycle.
Oven heats but never stops
In some board configurations, a lost sensor signal causes the board to run the element continuously, creating a runaway risk.
Error appears after oven bumps or moves
A jostled connector can trigger this code if the sensor wiring was already loose.
Possible Causes
Broken or disconnected RTD probe wiring
The wire harness between the sensor and control board may have a break, a loose connector, or a burnt terminal.
DIY PossibleFailed RTD temperature sensor
The probe element inside the oven has physically failed, showing infinite (open) resistance on a multimeter.
DIY PossibleDamaged control board input circuit
The sensor input circuit on the control board may be damaged, preventing it from reading the sensor even if the sensor is fine.
Requires ProfessionalSafe Checks You Can Do
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1
Inspect the sensor connector
Disconnect power to the range. Locate the RTD sensor on the back wall of the oven cavity and trace the wire to its connector, which typically plugs into the control board. Firmly seat the connector and check for corrosion or bent pins.
Use electrical contact cleaner on corroded connectors before reseating.
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2
Measure RTD sensor resistance
With power off, unplug the sensor and test resistance across its terminals with a multimeter. An open circuit (OL or infinite reading) at room temperature confirms a failed sensor. Replace the RTD probe.
Viking RTD probes are model-specific — always match the part number.
Tools required -
3
Check sensor wiring continuity
Set your multimeter to continuity mode. Test each wire from the sensor connector to the control board connector. A break in continuity means the wire must be replaced or spliced.
Wiring damage often occurs near the oven cavity opening where the harness flexes with door movement.
Tools required
When to Call a Professional
Contact a qualified technician if:
- Control board sensor input circuit diagnosis and repair.
- Wiring harness replacement requiring access behind the oven cavity liner.
- RTD sensor replacement if the probe is mounted in a hard-to-access location.
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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