I have a Fridgidaire Model # PLEB30S8CCC wall oven. The broiler works fine. The oven is very slow to heat up, 20 minutes to reach 250. I checked the lower element with a omp meter it read 20. Is that the proper reading? What else could it be?

Hello there and than you for choosing Fixya
If your oven does not heat, does not heat enough or does not broil, a common cause is a burned out heating element. There are two elements, the baking element on the floor of the oven and the broiling element on the ceiling of the oven. They are about the diameter of a pencil and typically supported by metal stand-offs.
This easiest test you can do is to turn on the oven and observe the heating element. If it glows red, the element is working. When baking, the broiling element may come on to assist with preheating or to maintain the oven temperature. When set to bake, if the broiler comes on, but the baking element does not, the likely cause is a burned out baking element.
When set to broil, the broil element should glow red, but the bake element typically is not used. If the broiler does not glow, it is likely a burned out heating element.
There are other possible causes of these symptoms, refer to our diagnostic page for some other possibilities.
To test the heating element using a multimeter, follow the steps provided below.

1. Unplug the oven or turn off the power at the breaker or fuse box.
   
2. Follow the heating element back to where it goes through the wall of the oven. Remove the bracket that secures the element in place.
   
3. Unscrew or unfasten any stand-off supports that secure the element to the oven.
   
4. Pull the element part way out to expose the oven's wiring connected the element.
   
5. Label the wires and secure them in place so they do not fall back into the cavity.
   
6. Disconnect the wires from the element.
   
7. Using a multimeter set to x1, touch one probe to each of the element contacts. Expect resistance in the range of 20 to 40 ohms. Infinite or kilo-ohm resistance usually indicates a bad element and it should be replaced.
   
8. If the element tests okay, reconnect the wires, slip them back into the cavity and resecure the element.

Good Morning! This problem could be related to a control board failure. We've repaired the control board from that model oven numerous times. Symptoms we've seen-- "oven does not come up to set temperature on bake or convection bake settings, no codes present, broil seems to be working correctly. elements test good" "Oven does not heat over 200 degrees. Serviceman said clock electronic control." "Elements not turning on" "Oven won't heat" "Clock and temperature hard to see".. http://www.fixyourboard.com can take care of those issues, and they back their workmanship with a two year warranty.