Ash looking substance on burner assembly

Discussion in 'Water Heater Forum, Tanks' started by Alma Howard, Feb 5, 2015.

  1. Alma Howard

    Alma Howard New Member

    Joined:
    Feb 5, 2015
    Location:
    Louisiana
    No hot water. When we checked the pilot light was out. Noticed ash looking substance on top of water heater. When we took out the burner assembly it was also coated in this substance. The problem turned out to be a defective thermocouple. But we are also wondering what this substance could be and what caused it.
     
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