Dometic steady on fault code — Furnace
Applies to: Hydro Flame AFM Series Furnaces AFMD16/AFMD20/AFMD25/AFMD30/AFMD35
What steady on means
The Dometic Hydro Flame AFM technical installation manual lists steady on with no flashing as internal circuit board failure.
Owner-safe checks
- Turn the furnace off.
- Record that the LED is steady rather than flashing.
- Do not continue operating the furnace if the fault remains.
Service-only work
- Circuit-board diagnosis or replacement is qualified RV furnace service work.
Safety boundary
RV furnaces burn LP gas and can create fire, explosion, electrical, burn, and carbon monoxide hazards. Shut the furnace off and do not service burner, board, wiring, gas, or combustion parts unless qualified.