Suburban oven won’t heat up

[Minky]

I have 2015 Cedar creek and I haven’t used the oven until recently to bake a pizza. It’s a suburban oven, the problem is the oven will not get to temperature ie: select a temperature of 350 the pilot light will light the diffuser. The flame on the diffuser is blue and very small. The flame will remain the same height no matter what temperature is selected and won’t heat to selected temperature. Any ideas how to repair the issue?