A4DA : High Current A Read all warnings and instructions prior to troubleshooting this product
- 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.