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An oven that will not heat is usually a failed heating element or the control that switches it, and the two are told apart by watching the element rather than by guessing. Uneven heating is a different question with a different answer: usually the fan, the seal or the sensor. On the PRO models the bake and broil elements are switched separately, so an oven that broils but will not bake has already told you which half to look at.
How this shows up
- Food browns on one side only — Browning that always favours the same side is a distribution problem rather than a heating one, and it usually has a cheaper answer.
- The broil works but the bake does not — Bake and broil are separate elements on separate switching, so one working while the other does not narrows the fault immediately.
- The oven overshoots or undershoots the set temperature — Overshooting or undershooting a set temperature is a calibration or sensor story. Confirm it with a thermometer before anything is replaced.
- NEAR MISS — The oven is dead — no display, no light, nothing — That is a supply or control fault rather than a heating one, and it belongs on the electrical page.
Causes, most likely first
- A failed bake or broil element — They fail one at a time, which is why an oven that broils but will not bake points immediately at the bake element rather than at the control. It is first because watching one cycle settles it, and settling it removes most of what is below. That is where the PRO order departs from the brand-wide one: a failed bake or broil element moves ahead of a worn door seal or a door that does not close square because it is confirmed by watching rather than by testing.
- The oven temperature sensor or its calibration — The sensor tells the control how hot the cavity is. When it reads high, the oven stops heating early; when it drifts, the oven never settles where it should.
- A worn door seal or a door that does not close square — It is the cause owners discount and technicians see constantly, because the gasket hardens invisibly over years.
- The convection fan or its motor — It is easy to confirm: open the door mid-preheat and listen, or watch the fan through the glass with the light on.
What to check first, and why
- First — watch the element through a preheat — With the oven empty and the light on, set a bake temperature and look. An element that stays dark, glows in patches or has a visible blister has answered the question without a meter.
- Second — measure the cavity with an oven thermometer — Put a thermometer in the centre, let the oven settle properly rather than reading it during preheat, and write down the difference.
- Third — check the door gasket all the way round — With the oven cold, run a hand along the seal for hardening, gaps and missing sections, and look for heat marks on the trim above the door. A leaking door explains slow and uneven before anything else does.
- Fourth — listen and look for the convection fan — Mid-preheat, open the door briefly or look through the glass. A fan that is not turning explains uneven cooking on a fan oven completely.
Before you open anything
Safety
Switch the oven off at its breaker before any panel comes off — a large cooking appliance sits on its own high-current circuit and a capacitor in the control can hold a charge after the power is off. Let the cavity cool completely before touching an element or a seal. If you smell gas at any time: do not switch anything on or off, leave the building, and call the gas utility or your emergency number from outside. Do not look for the leak yourself.
Where the owner job ends
Call when the element looks intact and never glows, when a thermometer shows the oven missing its target by a wide margin, or when a gas oven glows without lighting. Call immediately, from outside the house, if you smell gas at any time.
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Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
