An electric oven is slow to heat or not reaching the correct temperature most likely has a problem with the heating element. However it is also possible that the oven’s internal temperature is off. Some ovens have a dial that can be adjusted or calibrated. Other models have an electronic control board which regulates the ovens temperature that can be altered in order to provide a better baking experience. Here’s how to do this.
WARNING! Before attempting to work on any appliance, make sure that all power (electricity) and utilities (water and gas) have been turned off and/or disconnected on the appliance. Read this before you start any repair.