Lucy Soboleva Key Takeaways
- A failed temperature sensor (E101/Er1) is the most common cause
- Check that the oven is not in demo/display mode
- Self-clean lock issues can prevent normal heating
- A partially tripped breaker can power the display but not the elements
- Never use an oven that overheats — E115 requires professional repair
The Bottom Line
Check the circuit breaker and demo mode first. If E101 or Er1 appears, the temperature sensor needs replacement.
Why Your Bosch Oven Won't Heat
A Bosch oven that won't heat can have several causes, from a simple setting oversight to a failed temperature sensor. Before calling for service, work through these checks systematically — you may resolve the issue yourself, or at least identify the fault for a more efficient service visit.
Quick Diagnosis Table
| Symptom | Error Code | Likely Cause | DIY Fix? |
|---|---|---|---|
| Display works, oven cold | None | Demo mode active | Yes |
| Display works, oven cold | E005/E305 | Board communication fault | Try reset |
| No display, no heat | None | Partially tripped breaker | Yes |
| Oven won't heat, dashes on display | E101/Er1 | Temperature sensor failure | No |
| Self-clean won't start | E106/Er6 | Door lock failure | Try cleaning latch |
| Oven overheats then shuts off | E115 | Relay or sensor failure | No — safety issue |
Check 1: Circuit Breaker
This is the most overlooked cause. Electric ovens require 240V from a double-pole breaker. If one pole trips (which can happen silently during a power surge), the oven receives only 120V — enough to power the display and controls, but not the heating elements. Go to your breaker panel, find the oven/range breaker, turn it fully OFF, wait 10 seconds, then turn it back ON. This resolves the issue more often than you'd expect.
Check 2: Demo Mode
Bosch ovens have a demo/display mode used in retail showrooms. It runs all functions — clock, timer, display, fan — except heating. If your oven was recently installed or if the power was interrupted, demo mode may have been accidentally activated. The deactivation method varies by model — typically you hold a specific button combination during startup. Check your owner's manual or search "Bosch [model number] demo mode" for the specific procedure.
Check 3: Temperature Sensor Failure (E101/Er1/F31)
These are the most common error codes for Bosch ovens that won't heat. The temperature probe inside the oven cavity has failed — either the sensor element itself or its wiring. Without this sensor, the control board cannot regulate temperature and refuses to activate the heating elements as a safety measure. This always requires professional replacement — the sensor is located inside the oven cavity and must be matched to your specific model.
Check 4: Door Lock Issues
If the self-clean door lock is stuck in the locked position (E107), the oven may refuse to enter normal baking mode. Try turning off the breaker for 10 minutes — most Bosch locks have a power-off safety release. If the door won't lock for self-clean (E106/Er6), clean the latch area of grease — but note that this only affects self-clean, not regular baking.
Repair Cost Expectations
| Repair | Typical Cost | Notes |
|---|---|---|
| Breaker reset (DIY) | Free | Always check this first |
| Demo mode disable (DIY) | Free | Check owner's manual |
| Temperature sensor/probe | From $130 | Most common paid repair |
| Bake/broil element | From $180 | Visible burn-through on element |
| Door lock motor | From $150 | Only needed for self-clean |
| Control/relay board | From $350 | For E005/E305 persistent errors |
When to Call a Professional
If the breaker is fine, demo mode is off, and error codes point to a sensor or board issue, a technician is needed. Temperature sensor replacement is the single most common Bosch oven repair — it's straightforward and typically completed in one visit. Never attempt to use an oven showing E115 (overheating) — this is a fire safety issue that requires professional diagnosis of the relay and sensor system.