Thermador Oven: not heating

Professional Repair Guide

What is this symptom?

If your Thermador oven powers on but fails to heat during bake or broil cycles, you're likely facing a common issue. This could be due to a faulty igniter in gas models, a burnt-out heating element in electric models, or other potential causes such as a malfunctioning control board or temperature sensor. Understanding these issues can help you troubleshoot effectively.

Urgency: Medium

Important Tips for Thermador Models

  • Thermador ovens may support temperature calibration via control panel which can help minor temperature offset issues; refer to manual.
  • Igniter issues repeatedly d as most common cause of no heat in Thermador gas models.

Possible Causes

Faulty igniter (gas models)

How to Identify: Igniter does not glow or takes longer than ~90 seconds to ignite gas flame (visible during start of heating cycle indicating weak/failed igniter.

Part: Oven igniter

Burnt out heating element (electric models)

How to Identify: Element does not glow red when active; visible blistering or breakage; multimeter shows no continuity. (Appliance Parts Pros

Part: Bake or broil heating element

Faulty oven control board

How to Identify: Oven elements/igniter not receiving power even when commanded; control panel irregular behavior; visible damage or failed voltage tests. (Thermador Appliance Repair pros

Part: Control / electronic board

Temperature sensor malfunction

How to Identify: Oven heats but never reaches set temperature or overheats; multimeter resistance out of expected range. (Appliance Parts Pros

Part: Temperature sensor

Power supply issues

How to Identify: Oven not receiving full required voltage; tripped breaker; blown fuse; electric models not heating at all.

Part: Circuit breaker / outlet / oven power feed

DIY Solutions

Check and reset power supply

Easy 5-10 minutes
Tools Needed: none, circuit breaker access
  1. Check that the oven circuit breaker is not tripped and reset if needed.
  2. Ensure the oven’s power connection is secure and cord or hardwired connection shows no obvious damage.
⚠️ Safety First: Always ensure breaker is off before inspecting hardwired connections.

Inspect visible heating element condition (electric ovens)

Moderate 10-20 minutes
Tools Needed: flashlight
  1. Turn oven off and allow cooling.
  2. Visually inspect bake and broil elements for blistering, cracks, or breaks.
  3. If visible damage present, note that element likely needs replacement (professional or DIY based on skill level).
⚠️ Safety First: Ensure power to oven is disconnected before inspection.

Test oven temperature sensor (electric)

Moderate 15-30 minutes
Tools Needed: multimeter
  1. Disconnect power to oven at breaker.
  2. Locate temperature sensor in oven cavity (usually back wall).
  3. Test sensor resistance with multimeter; compare to expected ohm range (model-specific).
⚠️ Safety First: Disconnect power before access.

Professional Repairs

Replace oven igniter (gas)

Estimated Cost: $80 - $200

Replace heating element (electric)

Estimated Cost: $50 - $150

Replace control board

Estimated Cost: $200 - $500

Replace temperature sensor

Estimated Cost: $40 - $120

When to Call a Professional

Oven gas igniter fails to function or tests weak
Electric element replacement beyond user comfort/safety
Control board diagnosis/replacement
Repeated electrical tripping or complex wiring issues

Preventive Maintenance

  • Regularly inspect and clean oven interior and elements: Build-up causing element inefficiency or false heat readings
    Frequency: monthly
  • Annual professional inspection for gas ovens: Early detection of weak igniters or gas flow issues
    Frequency: annually

Frequently Asked Questions

Why is my Thermador Oven not heating?
Common causes include a faulty igniter, burnt-out heating element, or issues with the control board.
How do I fix Thermador Oven not heating myself?
Check the power supply, inspect the heating element, or test the temperature sensor.
How much does it cost to fix not heating?
Professional repairs range from $40 to $500 depending on the specific issue.
When should I call a technician for not heating?
If DIY solutions don't resolve the issue or if you're unsure about repairs, it's best to call a technician.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

75%
DIY Success Rate Difficulty: Either

Common Issues Reported by Users

  • Igniter malfunction (4 mentions)
  • Relay board issues (2 mentions)

User Suggested Solutions

  1. Replaced the bake igniter to restore normal operation.

    Success rate: 12.0%

  2. Replaced relay board with aftermarket relays after soldering.

    Success rate: 6.0%

  3. Replaced the igniter following a specific removal process.

    Success rate: 6.0%
Analysis based on 7 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Thermador Oven - Gas Explosion
  2. Thermador gas oven not heating properly
  3. Actual Robertshaw part number for oven thermostat on Thermad...
  4. Thermador prg486wdg /04 big oven problems
  5. Old Thermador oven not heating
  6. Oven heating element question
  7. Thermador oven igniter replacement

Community Discussions

E0210 error, two XLO burners not igniting

Replacing the display unit resolved the E0210 error.

DIY View on Reddit →

oven not heating properly

Replaced the bake igniter to restore normal operation.

DIY View on Reddit →

top oven not heating

Replaced relay board with aftermarket relays after soldering.

DIY View on Reddit →

igniter replacement issue

Remove zip ties, unscrew two screws above the burner, and replace the igniter.

DIY View on Reddit →

Oven won't heat

The issue was traced to faulty wiring that was not providing the full 240 VAC to the bake element.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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