These units can fail if excessive voltage is applied, causing the components on the board to become damaged.
If too much voltage is applied to the unit and the circuit board becomes damaged, there would be an increased risk of a fire.
What to do
Firefly has notified the RV manufacturers that purchased the affected multiplex units. and dealers for those RV manufacturers will add an additional circuit module to the existing component board to provide reverse polarity and over-current protection.
Owners may contact Firefly customer service at (574) 825-4600.