I turn the oven to 350 degrees and it never gets hot.
First, I guess we need to define hot. If you mean hot enough to bake whatever it is you wanted to bake, then it's possible, if this is a unit that has a "timed bake" feature, that someone neglected to put the control back in manual mode, after having used the "timed bake". If this happened, then the oven will only heat to 160 - 180 degrees, and will maintain that temp. It's called a keep warm setting, which is designed to keep the food that was recently baked, warm, until someone can come get it out and served. Check this feature if you have it and see if it's in manual mode, if not change it and the oven should heat up to 350 and beyond.
If there is NO "timed bake" feature, and there's some heat, just not enough to get to a bake mode, then it's possible that the oven's ceramic glo igniter is cracked and not heating to the point that it allows the oven's safety gas valve to open for gas flow to the burner. If there's no heat at all, the problem could still be the igniter, but it could also be electronic control box feeding the igniter. These things must be checked by a tech with an ohmmeter, and possibly replaced.
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