SYMPTOM

Yellow or Orange Flame on Burners

Appliance: Thermador Dual Fuel Range Models: PRD304GHU, PRD364GDHU, PRD366GHU, PRD486GDHU, PRD364NLHU, PRD486NLHU, PRD484NCHU, PRD305PH, PRD364JDGU, PRD366JGU, PRD486JDGU

⚠ What This Means

The burner flame appears yellow or orange instead of the expected blue. A completely or mostly yellow flame indicates a combustion problem that may require adjustment. However, some orange streaking is normal during initial start-up, and slight yellow tips are normal when using propane (LP) gas.

🔧 How to Fix

  1. Verify the burner cap is positioned properly on the burner base — a misaligned cap is the most common cause.
  2. Check that the burner ports are not clogged. Clean with a wire or needle.
  3. If the range was recently installed, allow 4-5 minutes of operation — some orange streaking during initial use is normal as manufacturing residues burn off.
  4. For LP gas installations: slight yellow tips on the outer (primary) cone are normal.
  5. If the flame remains mostly or completely yellow after the above steps, verify that the regulator is set for the correct fuel type (Natural Gas vs. LP).
  6. If the problem persists after all checks, call Thermador service at 1-800-735-4328.

🔍 Possible Causes & Solutions

Possible CauseHow to Fix
Burner cap misalignedRemove and properly reseat the burner cap on its base.
Burner ports cloggedClean ports with a wire, needle, or straightened paper clip.
Initial start-up residueNormal. Allow 4-5 minutes of operation.
LP gas (slight yellow tips)Normal for propane installations. No action needed.
Wrong fuel regulator settingVerify regulator is set for Natural Gas or LP per the installation.
Airborne impurities in gas supplyOrange in the flame from burning airborne impurities will disappear with use.

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❓ Frequently Asked Questions

Is a yellow flame on my Thermador burner dangerous?

A completely yellow flame indicates incomplete combustion and should be corrected. First check that the burner cap is properly seated. If the problem persists, call Thermador service. Slight yellow tips on LP gas are normal.

What color should Thermador burner flames be?

Flames should be blue with no yellow on the tips (for natural gas). The flame should burn completely around the burner cap and be stable with no excessive noise or fluttering.