Oven Not Heating — Troubleshooting Guide (All Brands)
An oven that powers on but won't heat up is one of the most common kitchen appliance failures across all brands. Whether you have a Bosch, GE, Whirlpool, Samsung, or LG oven, the root causes are largely the same — and most are DIY-fixable with a screwdriver and a multimeter.
Is It Electric or Gas? The Diagnosis Differs.
Electric ovens use a bake element (bottom) and broil element (top) — visible heating coils inside the cavity. Gas ovens use an igniter to open a gas valve and light a burner. The symptoms and parts involved differ significantly between the two types, so identifying your oven type is the first step.
Electric Oven Not Heating — Most Common Causes
Bake element failure: The most common cause. Look for visible burn marks or holes in the element at the bottom of the oven. Test with a multimeter (should read 15–50 ohms; OL means failed). Most bake elements cost $30–$80 and take 20–30 minutes to replace. Bosch calls this E305; GE uses F3 or F4; Samsung uses C-d0.
Temperature sensor failure: A failed NTC probe causes the oven to refuse heating as a safety measure. Bosch calls this F31; GE displays F3 E0 or F3 E1; Whirlpool shows F3. The sensor reads ~1080 ohms at room temperature on most ovens — open circuit or near-zero means it needs replacement. Sensors cost $20–$50.
Thermal fuse: Found on many wall ovens and some ranges, the thermal fuse is a one-time safety device that cuts power to the element when the oven overheats. Once blown, it must be replaced. Test continuity — it should pass. Cost: $5–$20.
Gas Oven Not Heating — Most Common Causes
Weak or failed igniter: The igniter is the most common cause of a gas oven no-heat. It must draw enough current (3.2+ amps) to open the gas safety valve. A weak igniter glows but never triggers ignition. Bosch calls this E118; GE uses F4; Whirlpool shows F9 or no code. Igniters cost $30–$70.
Gas valve solenoid coils: If the igniter glows correctly but the gas still doesn't flow, the gas valve coils may have failed. The coil kit is a less expensive repair than a full valve replacement.
When to Call a Technician
If the element and sensor both test good on an electric oven, the problem is likely the control board or a relay — these require a technician diagnosis. On gas ovens, if you smell gas at any point during troubleshooting, stop immediately: shut off the gas supply, ventilate the area, and call your gas utility or a licensed technician before proceeding.