Nat. gas oven not heating properly

Old 03-07-06, 04:53 PM
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Nat. gas oven not heating properly

I can't seem to find the answer I am looking for.
I have a natural gas stove. The oven does not heat to the proper temperature. I put in a thermometer that hangs from a rack to gauge the temp. According to it, the oven beeps when the temp is 25 degrees below what the digital read out says. For example, I set the oven for 450 and it alerts when the thermometer reads 425.
Now, it's 50 degrees off. But it's really cold in the kitchen.

If I give it more time, the thermometer eventually matches the read out.

Can a gas oven be calibrated? This is a new thermometer so it should be okay. The stove is a little over a year old. Is there a part I should replace?

Stumped in VA,
Old 03-07-06, 07:36 PM
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Hello Allyzabethe. Welcome to my Gas Appliances topic.

Oven thermostats can be calibrated but this service is best left to the professionals. Check the heat sensing element suspended in the ovens baking compartment. Must be secured in place or it will be a rod probe extending into the baking compartment.

The probe is the element rod that is at the top of the oven inside the baking compartment, that is the temperature sensing element. The temperature sensing element is attached (integral part) to the thermostat.

In order to replace the sensing element, which has to be done to control oven temperature, the entire thermostat must be replaced. The thermostat has to be the rotating dial type not the digital touch pad type.

The rotating dial type thermostat can be calibrated, if the actual temps are correct, as you described in one setting. However, more than 50 degrees between set temp and actual oven compartment temp, tested using a digital readout instrument, cannot be more than 50 degrees difference.

More than 50 degrees indicates the thermostat is beyond any adjustment range and must be replaced. Calibrations are not a do it yourself task. Best left to the professionals.

Some gas suppliers, natural gas companies and or propane suppliers may provide the calibration services free or at lower costs. Some companies do not even provide the service or any services. Contact your supplier and ask.

Below is an excerpt from a prior posting I posted on this topic:

When an oven fails to maintain the desired set temperature, before any parts are replaced, I suggest you have the thermostat checked for calibration. If the thermostat needs a recalibration, this is NOT a do-it-yourself project.

Special tools, training, practice, procedure and experience are needed along with the proper technique and adjustments made in the correct sequence in order to successfully accomplish the task.

Done incorrectly, as a do-it-yourself task, can ruin an otherwise good thermostat that only needed an adjustment...

I highly suggest you either contact the gas utility company and inquire if they perform this service. If they do not provide this service, contact the local appliance service dealer listed in the phone book.

If a thermostat fails to control oven temperature, burns food items you attempt to prepare, bakes much too quickly or the temperature soars up wards uncontrolled, chances are likely the thermostat will needed to be replaced.

Oven thermostats are a non repairable part. When determined to be defective, there isn't any other option except to replace the entire part.

Any oven thermostat that is more then 50 degrees out of temperature adjustment when the temperature is verified by a trained service person using either an electronic digital readout meter or liquid filled oven thermometer, the thermostat is considered to be defective.

Thermostats can be a do-it-yourself installation project. Care most be used during the installation process. Most importantly, handle the capillary extension tube sensor carefully. There cannot be any kinks or sharp bends in that thin copper/bronze/brass metal tubing.

Once the new thermostat is installed exactly as the prior one was, be sure to secure the sensor element, in the oven compartment, into the two holding/securing clips.

Temperature drops, differences and swings in the range you mentioned indicates the thermostat is defective. The internal bellows are worn out and or the temp sensor in the ovens baking compartment is defective. Only real option is to replace it.

The first thing to be sure of before attempting any repairs is to insure that the door closes correctly and completely.

Also check the door gaskets. Replace them if there is any doubt as to there condition.

Next is to insure there is nothing in the ovens baking inside area that would block and or restrict the natural flow of heat up wards and out the venting outlet. No aluminum foil is to be used ever.

If all the above is found to be in correct and or after replacing the door gaskets, call your gas supplier. Request a thermostat calibration be done to check and verify the condition exists.

If the condition does exist and the thermostat cannot be adjusted to correctly maintain the set temp, the thermostat is defective and must be replaced.

Oven thermostats cannot be calibrated without the usage of an electronic digital temperature sensing and display device. This electronic device is called a fluke. Named after the person whom invented it.

Any do it yourself attempts to adjust the temperature settings without this electronic device or a similar electronic digital readout device will do more harm than good. Trust me.

Read the manufacturers on line web site for product information, problem solving methods, disassembly instructions, repair procedures, pictorials and schematics, may be available on line.

An excellent source for original replacement parts is your local retail appliance parts store. Parts dealers are listed in the phone book under appliances. Bring the make, model and serial numbers if you stop in at the store.

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