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There could be different reasons. My dacha oven also started acting up once - first check if it's not clogged with coal and grease inside, sometimes that messes with the normal heat distribution. If it's clean, then most likely the problem is with the heating element or the thermostat - you'll need a professional for that, shouldn't try to mess with it yourself. Anyway, if simple cleaning doesn't help, call an electrician or an appliance repair specialist.
I had the same problem, so I feel for you 😅 First thing you should do is check the temperature sensor, it fails pretty often. Try setting the oven to maximum and see how hot it actually gets. If it barely warms up at all, it's probably the heating element or the thermostat. Unfortunately, without a multimeter or calling a technician, it's hard to figure out what exactly is broken.
Second thing - make sure the oven is plugged in correctly. I know it sounds obvious, but my neighbor and I spent like an hour and a half troubleshooting until we noticed the cable wasn't pushed into the socket properly 🙈 Also check if the ventilation is clogged - if air circulation is bad, the oven won't heat up right. If it's an older model, you might be able to find repair instructions for it somewhere online.
If none of that helps, I'm afraid you'll have to call a technician. I wouldn't recommend trying to replace the heating element or sensor yourself if you're not confident about it - you could break something or it could even be dangerous with electricity. In 2026, it's pretty easy to find good appliance repair technicians through apps or recommendations from neighbors 😊
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