A4DB : High Current B

  • Check wiring for touching wires.

 

  • Confirm resistance of heater.  Heater resistance should be 18-21 Ω for each heater element, 9-12 Ω combined for 10 kW systems, 6-8 Ω for 15 kW systems, and 4-6 Ω for 20 kW systems.  If out of tolerance, replace heater element.