Bosch Oven Not Heating

Bosch Bake Oven Not Heating Up (No Heat, Won’t Preheat): Field Checklist

Safety first
• If you smell gas, do not try to “test” the oven. Turn off the gas supply if you can do so safely, ventilate, leave the area, and contact your gas utility or emergency services.
• If you see sparking, burning odor, or repeated breaker trips, stop and schedule service or an electrician.

Step 1, Confirm it is actually started (most common “it looks on but won’t heat” miss)

1. Set BAKE, set temperature, then press START. Many Bosch controls will show “PRESS START” and will not begin heating until START is pressed.
2. Watch for a PREHEAT indicator and a temperature that begins climbing. (On many models, the display shows actual temperature rising in 5°F increments until it reaches set temp.)

Step 2, Cancel any delayed start or timed mode
• If you see DELAY or you programmed a stop time, the oven may be waiting to start. Bosch timed modes can be set to delay the start, and the display can show DELAY while waiting. Clear the timed or delayed program, then try a normal BAKE, 350°F, START.

Step 3, Check control lock (child lock)
• If you see a key icon or “LOC”, unlock the control panel. On many Bosch ovens, you press and hold the key symbol for about 4 to 5 seconds to toggle the lock. (bosch-home.co.uk)

Step 4, Rule out “demo mode” (classic symptom: preheat never ends, but the UI acts normal)
• Some Bosch ovens have a Demo Mode where the control panel responds but the oven will not heat, and “preheat will never end” (self clean may also not start).
• If you recently moved in, had an install, or the unit was a display model, check Settings for Demo Mode and turn it off. (Bosch demo documentation describes Demo Mode under Settings, and switching it Off to restore normal heating.)

Step 5, Confirm power and restore full power (especially for electric wall ovens)

1. If the oven display is on but it will not heat, check your electrical panel and fully reset the oven breaker. For electric ovens, loss of one “leg” of 240V (often called L2) can let the control panel appear normal while the oven will not heat. (Sears Home Services)
2. If it is a range, turn on a surface element. If the cooktop heats, you likely have full 240V. If it does not, start with the breakers. (Sears Home Services)
3. Bosch also recommends basic supply checks: confirm fuse and power supply, and compare with the hob function (if the hob works but the oven does not, that points to an oven fault rather than a whole home power interruption). (Bosch Home)

Step 6, After a power cut, set the clock if it is flashing
• Bosch notes that after a power cut the oven clock can revert and flash, and the oven may not operate normally until the time is set and the display stops flashing. (Bosch Home)

If it still will not heat, what usually failed (and what a technician verifies)
• Electric ovens: broken bake element, failed control board, or an incoming power problem are common causes. (Sears Home Services)
• Gas ovens: weak or failed igniter, gas supply shutoff, or control board issues are common causes. (Confirm the gas cut off valve is fully open and other gas appliances work.) (Sears Home Services)
• A proper diagnosis matters because multiple faults can look identical from the front panel. (Sears Home Services)

What to capture before scheduling service (saves a trip)
• Full model number and FD number (photo of the rating plate)
• What exactly happens when you press BAKE and START (any “PRESS START”, “DELAY”, “LOC”, or error code)
• Gas or electric (and whether cooktop burners or elements work)

NYC service (Bosch)
Volt & Vector Appliance Repair
• Phone: +1 (332) 333-1709
• Email: voltnvector@gmail.com
• Hours: Monday to Saturday, 9:00 AM to 6:00 PM
• Service area: Brooklyn, Manhattan below 96th Street, selected Queens ZIPs
• Diagnostic visit: $99, credited toward the repair on the same job, OEM parts only, 180 day parts and labor warranty

If you want, paste your Bosch model number and tell me whether it is gas or electric, and whether the display shows PREHEAT or “PRESS START”, I will narrow this to the most likely cause path for your exact platform.