1.The 91504 RV water heater control circuit adopts high-quality electronic components, adopts SMT technology, PCB files, high-quality materials, and strict production process requirements to ensure stable product performance.2.COMPATIBLE WITH: 91504 RV water heater control board compatible with Atwood, Dometic 91504, 91420, 91606, replacing Atwood 91504 SVC Control Board Fuse Assembly Kit Replacement parts compatible with water.3.REPLACE PART NUMBER: 91504, 91420, 91606, 93309. By sending a signal to the spark probe, our circuit board effectively initiates a propane ignition to heat the water. It expertly controls LP ignition and key electrical components.4. 91504 RV water heater ignition control circuit board replacement using OEM production standards, can .