I have changed control board and the board on the front not getting no codes.But the elements are not getting hot
Here are your parts
Parts for Whirlpool RBS275PDQ14 Wall Oven - AppliancePartsPros.com
See the attachment for the tech sheet.
I am assuming that the unit stays in preheat and never comes ready.
If it does then it could be the oven sensor.
You will have to pull the unit and check the Thermal Fuse (item 37 in section 01). It should be 0 ohms.
Also check that the oven is getting 240 volts.
RBS275.pdf (168.4 KB)