Oven Not Heating or Running the Wrong Temperature? Diagnostic Guide
Oven takes forever to preheat, burns one side, or never heats at all? Here is how Decatur technicians isolate bake elements, igniters, sensors and control boards.
An oven that will not heat on a Sunday afternoon, or one that turns every sheet of cookies into charcoal on the left and dough on the right, is the most common cooking call we run in Decatur, Druid Hills, Tucker and Stone Mountain. Electric and gas ovens fail in different ways, but the diagnostic path is the same: confirm power or gas, then test the heat source, then the sensor and the brain. Here is how we do it.
First: Is It the Oven or the Range Top?
If the cooktop burners work but the oven does not, power and gas supply are fine and the fault is inside the oven cavity or the control. If nothing works, check the breaker (a 40 or 50 amp double-pole for electric ranges) or the gas shutoff behind the range before anything else.
Also check for a Sabbath, Demo or Control Lock mode. On Samsung, LG, GE and Whirlpool ranges a locked control panel or a demo mode set at the store will let the display work while the oven refuses to heat.
Electric Ovens: No Heat at All
Bake Element
The lower element does most of the work. Set the oven to bake at 350°F and watch: it should glow evenly within a couple of minutes. Blisters, a visible break or a spot that stays dark mean the element has burned open. Broil-only heat is the classic sign.
Broil Element
If bake works but broil does not, the upper element or its relay has failed. Same test: it should glow red across its full length.
Hidden Bake Elements
Many newer Samsung, LG, Frigidaire and GE ranges hide the bake element under the oven floor. You cannot see it glow, so we test resistance at the terminals; a good element reads roughly 20 to 40 ohms, an open reading means replace it.
Oven Relay or Control Board
Elements test fine but never receive voltage? The relay on the electronic oven control has failed. This is common on ranges eight to twelve years old and shows up as an oven that heats intermittently before quitting entirely.
Gas Ovens: No Heat or Delayed Ignition
Igniter
The glow bar igniter must draw enough current, about 3.2 to 3.6 amps on most ranges, to open the gas safety valve. A weak igniter glows orange but never gets hot enough, so gas never flows. If the oven takes more than 90 seconds to light, or you smell gas with no flame, the igniter is failing. Shut the oven off and call us; a weak igniter is also a safety issue.
Safety Valve and Thermostat
If the igniter glows bright white-hot and there is still no flame, the gas safety valve is the fault. On older thermostat-controlled ovens the thermostat can also fail to send the call for heat.
Oven Heats but the Temperature Is Wrong
Temperature Sensor (RTD Probe)
The thin metal probe in the upper rear corner of the cavity reports temperature to the control. It should read about 1,080 ohms at room temperature. A sensor that drifts high makes the oven run cold and slow to preheat; a sensor that drifts low causes overheating and burned food. Error codes such as F1, F3, F30, F31 or E-08 point straight at the sensor circuit.
Calibration
Every electronic range has a calibration offset, usually ±35°F, buried in the settings. If an accurate oven thermometer shows the oven is consistently off by 15 to 25 degrees, calibration fixes it in two minutes. If it is off by more than that, or the reading swings widely, the sensor or control is the fault, not calibration.
Uneven Baking
Hot spots and one-sided browning usually mean a failed convection fan motor, a broken bake element heating only partially, a damaged door gasket letting heat out one side, or a range that is not level. We check all four.
Door Gasket and Hinges
A gasket that is torn or compressed flat, or hinges that let the door sag, dumps heat continuously. The oven cycles the elements far more often, runs long preheats and browns unevenly.
Self-Clean Aftermath
If your oven stopped heating right after a self-clean cycle, the extreme temperatures likely tripped a hidden thermal fuse or damaged the control board. Do not run self-clean on an oven older than five years without asking us first; the repair often costs more than the cleaning saves.
When to Call
Call us if you smell gas, if the igniter glows but the oven does not light, if the oven shows a fault code, or if replacing an element did not restore heat. Our technicians carry bake and broil elements, igniters, safety valves, temperature sensors and control boards for Samsung, LG, GE, Whirlpool, Frigidaire, KitchenAid and Bosch, and most oven repairs in Decatur, DeKalb County and Metro Atlanta finish in one visit.
Need a Technician Today? We're Local
Decatur Solution Works is based at 2318 Newgate Drive in Decatur and dispatches same-day across DeKalb County and Metro Atlanta, including Stone Mountain, Tucker, Lithonia, Avondale Estates, Druid Hills, East Atlanta, Dunwoody, Sandy Springs and Conyers. Our technicians are factory-trained on Samsung, LG, GE, Whirlpool, Maytag, Kenmore, Bosch, Sub-Zero and Wolf, and EPA 608 Type I certified for refrigerant recovery on both residential refrigerators and commercial refrigeration equipment.
- Residential: $89 diagnostic, credited toward your repair, with a written warranty on parts and labor.
- Commercial: $250 flat-rate diagnostic with a written quote before any work begins.