Oven

How to Tell If Your Oven's Thermostat Is Broken

If your baking has gotten unpredictable lately — same recipe, same timer, different results — the oven's thermostat is one of the first places to look before you blame yourself or the recipe.

The Clearest Sign: Food That Won't Cook Consistently

A cake that's raw in the middle one week and overdone the next, using the same settings, points to the oven not actually holding the temperature it says it's holding. This is easy to dismiss as bad luck with a recipe, but if it keeps happening across different dishes, the thermostat is the more likely culprit.

Test It Yourself With a Thermometer

Buy an inexpensive oven thermometer, the kind that sits on a rack, and set it next to the built-in display. Preheat to 350°F/175°C and compare the two readings once both have settled. A small difference is normal, but a gap of 20°F/10°C or more means the thermostat's temperature sensor — a thin metal probe mounted inside the cavity, usually near the back or top — has drifted out of calibration or is starting to fail.

Other Signs Worth Watching For

Beyond uneven baking, watch for an oven that takes noticeably longer to preheat than it used to, or one where the temperature seems to swing during a bake — visible as edges that burn while the center stays underdone. The oven's own "preheated" indicator can also be misleading, since it's reading from the same faulty sensor, not an independent check.

What This Repair Typically Involves

A failed or drifted temperature sensor is a common, moderately priced repair — it's a single component that a technician can test and swap out, not a sign the whole oven is on its way out. If your thermometer test shows a consistent, significant gap, it's worth having someone confirm the sensor is the issue before you assume anything more serious is wrong.

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