How do I test my oven temperature sensor?

The temperature sensor is a probe inside the oven, usually at the back upper corner. At room temperature (around 20°C / 68°F), most oven sensors read approximately 1080-1100 ohms. As temperature rises, resistance increases. Unplug the oven, remove the sensor, and test resistance with a multimeter. A reading far outside the 1080-1100 ohm range at room temperature indicates a failed sensor.

Oven Not Reaching Temperature? Causes & Fixes for Electric & Gas (2026)

Quick Answer

Electric oven: Failed bake element, weak broil element, faulty temperature sensor, or bad control board
Gas oven: Weak igniter (most common), faulty gas valve solenoid, or bad temperature sensor
Both types: Oven may need temperature recalibration (often DIY)
Safe DIY: Calibration, bake element replacement (electric only)
Call a tech: Gas igniter, gas valve, control board, any gas line work
Repair costs: $80–$400 depending on part; $89 diagnostic waived with repair

You set the oven to 375°F and wait. The preheat light goes off, you put your food in — and 20 minutes later things are barely warm. Or food is consistently undercooked no matter what temperature you set. This is one of the most frustrating kitchen problems, but it has a clear set of causes that are diagnosable without special tools. Here is what to check, in order.

Electric vs Gas Oven: Different Failure Points

Electric and gas ovens reach temperature in completely different ways, which means the parts that can fail are different too.

Electric Oven Components

Bake element (bottom of oven cavity)
Broil element (top of oven cavity)
Temperature sensor (resistance probe)
Electronic control board
Thermal fuse (on some models)

Gas Oven Components

Igniter (glow bar type on most modern ovens)
Gas valve and valve solenoids
Temperature sensor (resistance probe)
Safety valve (combination valve)
Thermostat or electronic control board

Step 1: Check Oven Calibration First

Before assuming a part has failed, verify that your oven is actually underheating. The built-in temperature display is not always accurate — most ovens can be off by 25°F to 50°F from the factory, and this offset grows over time.

How to test actual oven temperature:

Purchase a standalone oven thermometer ($10–$20 at any kitchen store).
Place the thermometer in the centre of the middle rack.
Set the oven to 350°F and allow it to preheat fully (wait 15–20 minutes after the preheat indicator goes off).
Read the thermometer without opening the door more than necessary.
If the thermometer reads within 25°F of the set temperature, your oven is calibrating normally.
If the thermometer reads more than 25–35°F below the set temperature, the oven needs calibration or has a failing temperature sensor.

Many ovens can be recalibrated yourself: Access the calibration setting through the oven's control panel (usually by holding the Bake button for 5 seconds). Most ovens allow you to add or subtract up to 35°F from the default calibration. Check your owner's manual for the exact steps.

Electric Oven: Failed Bake Element Maybe DIY

The bake element is the electric heating coil running along the bottom of the oven cavity. When it fails, the oven either produces no heat at all (complete failure) or heats unevenly (partial failure where only part of the coil still works). Bake element failure is the most common cause of an electric oven not reaching temperature.

How to identify a failed bake element:

Visible damage: look for a crack, blister, hole, or dark burn mark on the element coil
The element does not glow red-orange during the bake cycle
The oven takes much longer than usual to reach temperature
Food burns on top (broil element is compensating) but is raw underneath

Multimeter test: Unplug the oven or shut off its breaker. Remove the element (usually held by 2 screws and a plug-in connector). Test across the two terminals with a multimeter set to ohms. A working element reads 20–60 ohms. A reading of OL (open loop / infinite resistance) means the element is broken and needs replacement.

Bake elements for most brands cost $20–$80 and installation is straightforward on most models. This is one of the more accessible DIY oven repairs.

Electric Oven: Faulty Broil Element Maybe DIY

Many ovens use both the bake and broil elements during preheat to reach temperature faster. If the broil element fails, the oven may still heat but takes significantly longer to reach the set temperature. The top of food may also be underbaked or pale while the bottom cooks normally.

Test the broil element the same way as the bake element: visual inspection for damage, then a multimeter continuity/resistance test. A working broil element reads 10–50 ohms depending on the model.

Electric or Gas Oven: Faulty Temperature Sensor Maybe DIY

The temperature sensor is a metal probe inside the oven (usually in the back upper corner) that sends resistance readings to the control board. The board uses those readings to know how hot the oven actually is. When the sensor fails — reading too high or too low — the control board either cuts heat too early (oven too cold) or never gets the signal to heat (oven stays at room temperature).

How to test the temperature sensor:

Unplug the oven or shut off the breaker.
Locate the sensor probe inside the oven (usually 2 screws hold the bracket).
Disconnect the sensor's wiring harness.
Test resistance at the sensor terminals with a multimeter.
At room temperature (approximately 20°C / 68°F), a working sensor typically reads around 1,080–1,100 ohms (this varies by brand — check your model's spec).
A reading far outside this range — especially OL or near-zero — confirms a failed sensor.

Temperature sensors cost $20–$60 for most models and replace quickly. This is a beginner-friendly DIY repair.

Electric Oven: Failed Control Board Call a Tech

The electronic control board is the brain of a modern electric oven. It processes temperature sensor readings, controls relay outputs to the heating elements, and manages all timing and display functions. When the board fails, the oven may not heat at all, may heat erratically, or may display fault codes.

Control board diagnosis requires a technician in most cases — the board can fail in ways that aren't obvious without professional diagnostic equipment. Replacement boards cost $150–$350 depending on the brand.

Gas Oven: Weak or Failing Igniter Call a Tech

The igniter is the most common cause of a gas oven not reaching temperature. Modern gas ovens use a glow bar igniter that must draw enough electrical current to open the gas safety valve before gas can flow. The typical threshold is 3.2–3.6 amps. As the igniter ages, it weakens and draws less current. It still glows, but not brightly enough to fully open the gas valve — so the oven either produces a very weak flame or no flame at all.

Signs of a weak igniter:

You can see the igniter glowing orange-red through the oven floor, but the burner takes more than 90 seconds to ignite (or doesn't ignite at all)
The oven reaches temperature sometimes but fails other times
Baking takes 30–50% longer than recipes specify

Testing igniter current draw requires an amp clamp meter and knowledge of gas appliance components. This is a job for a certified technician. Gas igniter replacement costs $150–$280 all-in and is the most common gas oven repair.

Gas safety: Never attempt to repair gas valve components, gas supply lines, or burner assemblies yourself unless you are a licensed gas technician. Gas leaks and improper igniter installation create serious fire and carbon monoxide risks. Always call a certified appliance technician for gas oven repairs.

Gas Oven: Faulty Gas Valve Solenoids Call a Tech

The gas valve has one or more solenoid coils that open and close the valve when energized by the igniter's current. If a solenoid coil burns out, the valve won't open even if the igniter is working perfectly. Solenoid failure is less common than igniter failure but shows similar symptoms: igniter glows, but gas doesn't flow or only flows partially.

Diagnosis involves testing each solenoid coil with a multimeter for resistance (a failed coil reads OL). This test is done with the gas valve disconnected from the gas supply and should be performed by a certified technician.

Repair Cost Comparison

Part	Oven Type	DIY or Pro?	Typical Cost (All-In)
Bake element	Electric	DIY-friendly	$80–$200
Broil element	Electric	DIY-friendly	$80–$200
Temperature sensor	Both	DIY-friendly	$80–$180
Temperature recalibration	Both	DIY	$0 (oven thermometer ~$15)
Igniter	Gas	Pro only	$150–$280
Gas valve / solenoids	Gas	Pro only	$200–$350
Control board	Both	Pro recommended	$200–$400

Frequently Asked Questions

The most common causes depend on whether you have an electric or gas oven. For electric ovens: a failed bake element, a weak broil element, or a faulty temperature sensor are the top culprits. For gas ovens: a weak igniter that glows but can't open the gas valve is the most common issue. In both types, a failed control board or miscalibrated temperature sensor can also cause this.

A failed bake element often has visible damage — look for blistering, cracks, holes, or a dark spot where the element has burned through. Even without visible damage, a failed element can be confirmed with a multimeter: unplug the oven, remove the element, and test the terminals for continuity. No continuity (OL or infinite resistance) means the element has failed and needs replacement.

You can use the broil function if the broil element is working, but baking will be ineffective or impossible with a failed bake element. Do not continue using an element that shows visible damage like cracks or burn holes — it can arc, cause sparks, or create a fire hazard. Bake element replacement is one of the more affordable oven repairs.

The temperature sensor is a probe inside the oven, usually at the back upper corner. At room temperature (around 20°C / 68°F), most oven sensors read approximately 1,080–1,100 ohms. Unplug the oven, remove the sensor, and test resistance with a multimeter. A reading far outside the 1,080–1,100 ohm range at room temperature indicates a failed sensor.

The most common reason a gas oven doesn't reach temperature is a weak igniter. The igniter must draw enough current to open the gas valve — typically 3.2–3.6 amps. A weak igniter glows orange but can't open the valve fully, so gas flows at reduced pressure and the flame is too small to heat the oven properly. The fix is igniter replacement, which a certified technician should perform.

Oven repairs in Toronto typically cost $120–$350 depending on the part. A bake element replacement runs $80–$200 all-in. Temperature sensor replacement costs $80–$180. Igniter replacement on gas ovens is $150–$280. Control board replacement is the most expensive at $200–$400. Nick's Appliance Repair charges an $89 diagnostic fee that is waived when you proceed with the repair.

Yes — oven temperature calibration is a safe DIY task on most modern ovens. You need an accurate oven thermometer (not the built-in probe). Compare the actual temperature to the set temperature, then adjust the calibration through the oven's settings menu. Most ovens allow ±35°F of adjustment. Check your owner's manual for the specific steps, as the process varies by brand.

Oven Not Reaching Temperature? Causes & Fixes for Electric & Gas Ovens (2026)