If your oven is consistently off temperature — burning cookies, undercooking roasts, or swinging more than ±25°F — you've got a calibration drift or a failing temperature sensor. Both have easy fixes.
Most oven symptoms get diagnosed and fixed on the first visit. Flat $179 diagnostic — fully waived when you approve the repair.
Step-by-step
Place a quality oven thermometer in the center of the middle rack. Set the oven to 350°F. Wait 30 minutes after the preheat beep. Compare actual to set temperature. Anything within ±15°F is normal cycling.
Most ovens made after 2005 have a temperature offset in the menu (often labeled 'Bake Adjust', 'Calibration', or under Settings). The range is usually ±35°F. If your oven runs 30°F low, set the offset to +30. Check your owner's manual for the exact button sequence.
Convection ovens: set to convection bake, watch the fan through the window or listen at the back. If it's not running, the fan motor or relay has failed and you'll get hot/cold spots in every bake.
Open the door and run a hand around the silicone seal. Look for tears, hardened spots, or gaps. A failed seal lets heat escape and the burner has to overshoot to keep up — your set temp and actual temp diverge constantly.
Pull the oven away from the wall. The sensor is a small probe in the upper-rear of the oven cavity, with two wires running to a connector at the back. Disconnect, ohm out the sensor: should read ~1100Ω at room temp (rises with temperature). Way off = bad sensor, $35 part, 15-minute swap.
Run the oven thermometer test again at 350°F. If you're within ±15°F at the set point, you're done. If you're still off after sensor + calibration, the control board is failing.
Stop and call
Safety + model triggers
Gas oven temperature swings 75°F+ AND you smell gas.
Gas valve cycling improperly — leave, ventilate, call your gas utility first.
Breaker trips when the oven holds heat for more than 10 minutes.
Element or wiring shorting as it heats up — escalates to a cabinet fire if ignored.
Wall oven, double wall oven, or pro range (Wolf, Thermador, Viking, Miele, Sub-Zero).
Calibration and sensor service on built-ins requires pulling the unit from the cabinet — special tools, two techs.
Calibration maxed out (±35°F) and oven still off after sensor swap.
Control board failing — board replacement on premium ovens often hits replacement-cost territory.
Other reasons to call
FAQs
Modern ovens hold ±15°F at set point during normal cycling. Anything outside that needs calibration, and ±35°F+ usually means a failing sensor or control board.
Most ovens have a 'Bake Adjust' or calibration setting in the control menu — typical range is ±35°F. Verify with an oven thermometer first, then adjust by the difference. Check your owner's manual for the exact key sequence.
No, but it's cheap to replace ($35 part, 15-minute job). The sensor is a sealed thermistor — when it drifts out of spec it gets swapped, not rebuilt.
Failing bake element, weak gas igniter, or door seal letting heat escape. A modern oven preheats to 350°F in 8–12 minutes. Anything over 20 minutes warrants investigation.
Calibration: free DIY. Temperature sensor: $220–$300. Door gasket: $180–$280. Control board: $450–$750. Diagnostic if you've tried calibration: flat $129 ($179 built-in), waived with repair.
Related service
Pro-style ranges, wall ovens, induction cooktops, gas cooktops — we diagnose and repair every configuration on the same visit when possible. Same-day windows across the Twin Cities, Central MN, and Western Wisconsin.
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