Oven Thermostat Not Working Properly – A Complete Troubleshooting Guide

By Fix4U Team
Oven, Kitchen Appliances

Is your oven not heating to the right temperature or taking too long to preheat? An oven that is not maintaining proper temperature is one of the most common issues homeowners face. The problem often lies with a faulty oven thermostat.

The thermostat is responsible for regulating the oven’s temperature. It communicates with the heating elements to turn on and off as needed to reach and maintain the set temperature. When the thermostat malfunctions, the oven may heat inconsistently, remain too hot or cold, or not heat at all.

Fortunately, there are several troubleshooting steps you can take to diagnose and fix an oven thermostat that is not working properly. In this comprehensive guide, we will walk through how to pinpoint and resolve common oven thermostat problems.

How The Oven Thermostat Works

Before diving into troubleshooting, it helps to understand how the oven thermostat functions:

Fix4U Repairs' Technicians Fixing Oven Thermostat Not Working Properly  Problem In Gta
  • The thermostat is typically located behind the temperature control knob or panel. It contains a sensor that monitors the internal oven temperature.
  • When you set a target temperature, the thermostat receives this input and communicates it to the heating elements.
  • As the oven heats up, the thermostat sensor measures the rising temperature. Once it hits the target temp, the thermostat signals the heating elements to turn off.
  • When the oven cools below the set point, the thermostat tells the heating elements to turn back on to reheat. This cycle continues to maintain the oven at the desired temperature.
  • The thermostat matches the heating elements needed for various oven functions like bake or broil. It ensures each element turns on at the right intensity.

With this basic understanding of how oven thermostats work, let’s look at some troubleshooting steps.

Troubleshooting An Oven Thermostat

If your oven is not heating properly, there are several things you can check before calling for service. Follow these tips to troubleshoot an oven thermostat issue:

1. Check The Oven Temperature

The first step is to verify that the oven is not heating to the temperature you set. Here’s how:

  • Place an oven-safe thermometer inside the oven. Position it away from the sides and as center as possible.
  • Set the oven to 350°F and allow it to preheat fully, at least 15-20 minutes.
  • When the oven beeps to indicate it has preheated, check the thermometer. Is it close to 350°F, or significantly higher or lower?
  • Repeat this test at higher (400°F) and lower (300°F) temperatures.

If the oven thermometer shows the internal temp is off by more than 15-20 degrees from what you set, the thermostat likely needs adjustment or replacement.

2. Perform A Thermostat Continuity Test

If the oven isn’t heating properly, the next step is checking the thermostat itself for functionality. You’ll need a multimeter to do a continuity test.

  • Unplug the oven or shut off power at the breaker.
  • Remove the back service panel to access the thermostat. It’s often near the upper-right rear of the oven.
  • Disconnect the thermostat wiring from the power board or other connections.
  • Set the multimeter to test for continuity and touch the probes to the thermostat terminals. The meter should show continuity (beep or 0 ohms resistance).
  • Turn the temperature dial through its full range. The meter should show continuity at some points and open circuits (no beep) at other points as you turn the dial.

If you don’t get the expected results, the thermostat is likely faulty and should be replaced. Contact us for professional oven thermostat repairs.

3. Check Thermostat Wiring

Faulty wiring between the thermostat and oven control board can also prevent proper operation.

  • With the oven unplugged, remove the thermostat panel and inspect all wiring.
  • Look for any loose wire connections. Tighten any loose screws or terminals.
  • Check the condition of the wires. Replace any wiring that is cracked, frayed, or burnt.
  • Ensure wires are connected to the correct terminals according to the wiring diagram.

Correct any wiring issues you find. If the oven still doesn’t heat appropriately, move on to replacing the thermostat.

4. Replace a Faulty Oven Thermostat

If you’ve tested the thermostat and confirmed it is defective, replacement is needed. Refer to your oven model’s service manual for the proper thermostat part number and replacement procedure.

Here are some tips for safely replacing an oven thermostat:

  • Order the correct replacement thermostat for your oven make and model.
  • Turn off power to the oven at the breaker panel.
  • Remove the back service panel and housing around the thermostat.
  • Label and disconnect the wire connections. Remove mounting screws to extract the thermostat.
  • Install the new thermostat with mounting screws and reconnect the wiring properly.
  • Replace the housing panel and restore power.
  • Test oven operation through a full heating cycle to confirm it now works properly.

Replacing a faulty oven thermostat yourself can save the cost of a service call. However, if you are unsure of any wiring connections or steps, contact a pro for assistance.

Oven not heating right? Call Now to Fix Your Oven!

When To Call An Oven Repair Technician

If you’ve worked through all of the above troubleshooting tips but the oven thermostat still fails to regulate temperature correctly, it’s time to call a professional. Especially if you see any of these issues:

  • Oven temperature swings wildly above or below the set point
  • Oven takes too long to preheat – more than 15 minutes
  • Oven does not heat at all
  • Oven continues heating even when turned off
  • Burning or smoke smell from oven
  • Oven stops working and trips breaker
  • Noticeable sparks, flames, or electrical arcing inside oven

Our experienced Fix4U Repairs technicians have the training, equipment, and expertise to properly diagnose oven thermostat issues. We will troubleshoot the problem and clearly explain the issue and repair options. If the thermostat needs replacement, we have all necessary parts on hand to complete the repair.

(647) 363-5205

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