Kenmore Oven F31 Error: Oven Temperature Sensor Short Circuit
The kenmore oven f31 error is a fault signal from the control board — this guide walks through what it means, common causes, and safe diagnostic steps. What Does Kenmore Wall Oven Error Code F31 Mean? F31 on a Kenmore 790-series wall oven (Frigidaire/Electrolux platform) is the complement to F30: where F30 means the RTD […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. The Kenmore wall oven will not heat with F31 active and is not safe to reset and attempt to use — the shorted sensor condition could potentially cause the board to misread temperature if the fault is intermittent, creating a risk of thermal runaway. Repair the sensor before use.
Can I reset the code?
No. Resetting the breaker clears F31 from the display momentarily, but the fault returns immediately on the next cook command because the shorted sensor condition is still present. Only sensor or harness replacement resolves F31 permanently.
When to stop immediately?
Stop if you notice: F31 returns immediately after a new RTD sensor is installed — indicating the harness itself is shorted, The sensor harness shows visibly abraded insulation with bare conductors in contact.
Symptoms You May Notice
F31 displayed on startup before the oven reaches any temperature
The ERC board checks the sensor immediately on receiving a cook command. A shorted RTD probe reads near-zero ohms, which the board maps to an impossibly high temperature — setting F31 and disabling heating before the oven can be used.
Oven will not heat — same behavior as F30 but for the opposite sensor failure mode
Both F30 (open sensor) and F31 (shorted sensor) result in a Kenmore 790 wall oven that refuses to heat. The distinction matters for diagnosis: F30 means the sensor wire has broken; F31 means the sensor wires have shorted to each other or to the probe body.
Display shows F31 alternating with a very high temperature reading like 999°F
Some Kenmore 790 ERC firmware versions display the erroneous temperature derived from the shorted sensor resistance alongside the F31 code, showing implausibly high readings that make clear the sensor is misreporting to the board.
Oven vent blows cool air while F31 is displayed
Air from the cooktop vent stays at room temperature with F31 active, confirming no heating has occurred — unlike a true overheat, the cavity is cold even though the board thinks the sensor is reading an impossibly high temperature.
Possible Causes
RTD sensor probe internally shorted — the sensing element wires have fused together
The resistance wire inside the RTD probe has developed a short circuit, reducing the resistance to near zero. This typically results from insulation failure within the sealed probe body caused by heat or moisture over years of use.
DIY PossiblePinched sensor harness wire where the two conductors have shorted together
The two-wire sensor harness has been pinched between the cavity wall and a oven rack guide or other metal part, causing the conductor insulation to abrade away and the bare wires to contact each other, producing a short circuit at the harness rather than the probe.
DIY PossibleMoisture intrusion into the sensor connector creating a leakage short
Condensation or steam intrusion into the two-pin sensor connector has created a conductive moisture bridge between the pins, producing a low-resistance reading that the board flags as F31.
DIY PossibleSafe Checks You Can Do
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1
Measure RTD sensor resistance to confirm a short circuit
Turn off the circuit breaker and allow the oven to cool fully. Remove the RTD probe from its upper rear cavity mounting bracket (two screws) and disconnect the two-wire harness. Measure resistance across the two probe wires only (not the harness). A reading of less than 500 ohms at room temperature confirms a shorted probe — replace it with the correct Frigidaire-platform RTD (part 316217002 or model-specific equivalent).
Always measure the probe wires in isolation, disconnected from both the harness and the ERC board. Measuring at the board connector without disconnecting the probe includes harness and board input resistance in the reading, which can mask or amplify the true probe condition.
Tools required -
2
Inspect the harness for pinching and the connector for moisture
Trace the full length of the sensor harness from the probe mounting point at the rear cavity wall to the ERC board connector. Look for any section where the harness passes close to metal edges or rack guide mounts and shows flattened or scraped insulation. Inspect the connector for water droplets or mineral deposits between the pins. Dry any moisture with a lint-free cloth and allow the connector to air out fully before restoring power.
A harness pinch at the cavity wall entry grommet is the most common location for a short-circuit harness fault on Frigidaire-platform built-in ovens. Route any replacement harness through the grommet carefully and away from all metal edges.
When to Call a Professional
Contact a qualified technician if:
- New RTD sensor installed but harness continuity test shows a short between conductors — requiring harness replacement or pigtail repair
- Moisture is present inside the cavity wall at the grommet entry point, indicating a vapor intrusion issue that will recur without grommet sealing
- F31 persists after confirmed sensor and harness replacement — indicating ERC board ADC input shunt failure
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