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When your oven is taking too long to heat, try the following:
If you suspect your oven temperature is not accurately setting temperature, consider calling either the manufacturer or place of purchase, or a local appliance professional.
How to fix a slow cooking oven can depend on if it is gas or electric.
For electric ovens:
Check the heating elements. When the oven is on, ensure that the metal rods which heat the oven are heating up. They may need to be replaced or adjusted.
Adjust the thermostat. Over time, thermostats can fluctuate from factory settings. If your thermostat is adjustable, you can find out how by checking the owner's manual.
For gas ovens:
Check the thermostat. You may need to adjust, replace, or calibrate your thermostat. Learn now by checking the owner's manual.
Check the burner. You want to make sure the small holes are free and clear and that the fire is appearing normally.
Check the ignitor. Ignitors can be weak without failing completely. It can be checked with a multimeter (if you have one, and know how to do that). See your user’s manual for more detailed information.
Other things to try:
Clean the oven. Try removing grease or stuck debris from the heating elements, fans, and thermostats.
Adjust the baking racks. Racks that are too far away from baking elements can be slower to heat.
Ensure that the air flow is open. Tin foil or other materials left in the oven may be restricting airflow.
If you don't what to perform these checks yourself, or don't know how, contact a local oven repair service.
There are many potential fixes for an oven cooking too hot.
Simple Fixes:
Clean the oven. Try removing grease or stuck debris from the heating elements, fans, and thermostats.
Check the air flow. Make sure that the oven fans and vents are distributing the air (and therefore the heat) normally. Fans that don't work can cause both under- and over-heating.
Adjust the racks. Rack placement can cause food to heat too quickly, or slowly.
Try different cookware. Old or incorrect cookware can become too hot unexpectedly.
If those simpler fixes don’t work, the following components may need to be repaired or replaced:
thermostat,
control panel, adjustable knobs,
heating elements,
fans, vents.
For these issues, you'll want to contact a local over repair pro.
Whether or not you should attempt to fix the issue yourself depends on the exact nature of the problem, the work involved, and your level of comfort.
Common causes for stove burners not working include:
Gas: grease clogs, loose or broken connections, broken or dislodged ignitor
Electrical: worn out burners, faulty switches, broken sockets.
Fix it yourself if:
the issue is cleaning-related (clogs, grease),
the parts are simple to replace (electrical burners),
you are knowledgeable and feel comfortable taking apart the stove and testing for possible electrical issues.
Call an oven service professional if:
cleaning and/or replacing broken or worn parts didn’t fix the problem,
the issues seem too complex (burner socket),
you don’t have proper tools for testing and repair (e.g., multimeter).