Oven Temperature Resetting Itself? This Might Be Why

You are probably here looking for a solution or explanation for why your oven temperature keeps resetting itself. Many homeowners file complaints with HVAC technicians that their ovens seem to be operating at a different temperature from the one they set before leaving the machine unattended. The funny thing is that some of these people live alone, ruling out the chance that someone may have messed up with the oven when they went away.

Some oven brands come with a specific set temperature to which the oven keeps reverting whenever it misbehaves. This article looks at some of the reasons why the oven keeps resetting itself. Read on to find out!

Electrical Faults

This is the first culprit when the oven keeps resetting itself. Earlier oven versions contained manual controls and whatever happened meant that someone had caused it. Gas ovens, too, are not affected by these factors unless they have some electrical components. Electrical faults can cause the oven to lower or raise the temperatures because it interferes with the smooth operations of the electrical components.

The electric oven contains a complex cycle of wires, circuits, cables, thermostats, switches, and other components that require electricity to run. Electrical faults in one of these components may negatively interfere with how they run. A faulty switch, for example, may keep shutting off the machine, and when it restarts, the default temperature will come into play.

If your electric oven keeps resetting itself, there’s probably an issue with some electrical systems. A short in one of the components may cause the appliance to shut down due to safety concerns. When the electrical short is over, the machine will operate at the default temperature and not at the temperature that you had previously set.

Insufficient power supply to some of these components causes them not to operate efficiently. Some ovens feature smart touch boards that work by sensing the touch pressure or temperature difference. If there is some issue with the power supply to such components, they may keep resetting the set temperature on the touchpad.

If you suspect that a faulty electrical component is causing the temperature to reset, please enlist professional oven diagnostic services.

 A Broken Thermostat

A thermostat is responsible for temperature regulation inside an electric oven. The thermostat contains temperature sensors that detect whether the temperature is too high or too low and tells the control board the next course of action-to correct either situation to keep the temperature at the set minimum. A faulty thermostat may mislead the control board to regulate the temperature unnecessarily.

If the electrical components are functioning correctly, you may want to check the thermostat to ensure smooth running. A thermostat can misbehave in several ways. The first way is a faulty electrical connection. The wires leading to the thermostat may be broken or short-circuiting, leading the thermostat to reset the temperature between cooking. Use a multimeter to check for continuity in the thermostat power cables.

The second way a thermostat may malfunction is through faulty sensing apparatus. Typical thermostats usually feature a short rod protruding from the tub that records temperature changes. If the rod is bent, broken, or jutting out too far into the oven, it may sense a false over-temperature, thus triggering the thermostat to reset the temperature automatically. You can test it using a multimeter and buy a replacement if it is broken.

Opening the oven door while in operation

Sometimes you may think that the oven is resetting itself since you didn’t touch the control board. However, some of your actions may reset the oven temperature without your knowledge, like opening the door. Be observant the next time you bake some cakes or grill some steaks.

This concept is easy to grasp because opening the oven door causes compressed hot air inside the box and it rises to the ceiling. The cooler air at room temperature rushes in to replace the outgoing hot air. Even if you open the door a little bit, then quickly shut in the escaping air, the chance is, some of the initial temperature will be lost. The control board will indicate a different temperature from the one you set, and if you aren’t observant, you may think that the oven has reset "itself."

Here is the math. You set the oven temperature at 270 degrees Farenheight and your room temperature at 70 degrees Farenheight. Once you open the oven door, some hot air will rush out, and the cold air will enter the box. The 270 degrees Farenheight air will warm the 70 degrees, thus losing some 70 degrees in the process. When you look at the control panel immediately after closing the door, it will be reading 200 degrees Farenheight.

An oven’s heat retention, especially the usually general-purpose home oven, depends on many factors such as insulation between walls and the sidewalls’ metal density. Your oven’s heat retention may also keep resetting your oven temperature if the oven is losing more heat than the intended ideal. The thermostat may overwork trying to keep up, leading to overheating, which will automatically trip the oven, thus resetting the temperature.

A Faulty Keypad  

The control panel mostly comes to most people’s minds when you mention the term keypad. The two terms are loosely interchangeable because, somehow, the touchpad is part of the control panel as a control interface, but not the control panel itself. You will learn how to distinguish between the two components and how they cause the oven to reset the temperature by itself.

The control panel is a combination of the touch and display pads, which is the user interface. The user interface allows you to communicate with the machine and shows you what is going on inside the machine. For example, the temperature you set and the temperature inside the grill will be displayed on the control panel.

On the other hand, the touchpad allows you to input your commands into the control panel or alter the operations of the machine. It is made up of buttons that you press or touch with your fingers. The buttons usually feature numbers 0 to 9 and other commands such as Timer, Bake, Broil, etc. Consequently, the touchpad is usually the primary suspect when the temperature keeps resetting mysteriously. Let’s look at different types of keyboards and their roles in temperature fluctuations.

Membrane Keypad

The membrane keypad is much like the traditional button keypad. It contains some pressable buttons coated with vinyl plastic then inserted into the metal or hard plastic control panel, usually visible from the front of the oven. They are tactile because you can feel the clicking as you press each button, but don’t give much confidence that you are pressing a button, especially when the control board fails.

You need to understand that pressing a button is actually pushing an electrical switch with your finger. These buttons sometimes get stuck as the parts wear out, and a stuck temperature control button can keep resetting the oven temperature without any tactile action from you.

Capacitive Touch Keypad

The capacitive touch keypad features smart or touch buttons, which are much different from the traditional clicking buttons. There’s no distinguishable touch action when you touch them because no clicking comes out. Capacitive touch keypads are different in that they are set on the glass instead of plastic and react to slight interruptions in the electricity field caused by your finger.

This type of keypad is prone to any factors that may interfere with the given electrical field, such as an insufficient supply of electricity, electrical surges, and short-circuiting that may cause the touchpad to misbehave to reset the oven temperature, among other things. The membranes in capacitive touch panels fail more frequently than other parts, and therefore, you should have the touchpad regularly inspected to curb this problem.

Built-in Momentary Switch Buttons

These are the “real buttons" because you can hear loud clicks whenever someone is operating them. The capacitive and membrane keypads are set on separate areas, but the built-in switch buttons are mounted directly on the control board using plastic peg actuators. Whenever you press the button and hear the sound, just know that you are actually closing an actual electrical switch to control the function of the oven directly.

Built-in switch buttons are typically less prone to problems than their earlier-mentioned counterparts, although it doesn’t mean they are perfect. The plastic peg actuators may fall out of place and trigger other switches they were not supposed to touch. They can also let in other foreign elements such as dust and water into the control board, which may interfere with the smooth functioning of the control board. Foreign objects may reset the oven temperature if they cause short-circuiting or touch the switch that controls the oven temperature.

Main Control Board (PCB)

Remember we mentioned that the control panel interface is much different from the main control board because it’s made up of buttons and a lighted interface. The term control board mainly refers to the printed circuit board (PCB), a square or rectangular part behind the oven that controls all the oven’s functions. It’s similar to a motherboard on a computer or smartphone.

A PCB uses electricity to "think" and is made up of electrical circuits, wires, transistors, resistors, and electronic components that aid in operation. Manufacturers insist that the control board should last the entire life of the appliance.

However, the component may get damaged due to power hiccups and malfunctioning of other electrical parts. For example, the failure of the cooling fan to operate properly may cause overheating, which may damage the control board and other components. Power surges and short-circuiting may damage the capacitors and transistors and sometimes cause actual burning.

A damage control board may sometimes reset oven temperatures if the PCB is still functional, but the thermoregulators are damaged.

Bottom Line

The oven temperature doesn’t mysteriously reset itself. Temperature reset is a deliberate action, sometimes on the manufacturer’s part and other times accidentally by the user. System malfunctions such as power surges, short-circuiting, and damaged parts may cause temperature reset. Whenever your oven mysteriously sets the temperature, get it inspected because the control panel, thermostat, electrical connections, and the main control board (PCB) might be damaged.