RV Atlas

Dometic ยท 6 codes

Dometic DF and Hydro Flame AFM furnace fault codes

Every fault code, display message, and status light listed in Dometic's manuals for Dometic DFSA / DFSD / DFMD / DFLD / DFLA furnaces; Dometic DF series furnace; Dometic Hydro Flame AFM series furnaces. Select a code for what it means, what you can safely check, and when to call a technician.

Confirm your model

Codes are model-specific. Match the model number on the appliance data label to one of these before using the table:

DFSA/DFSD/DFMD/DFLD/DFLA furnace series, DF series furnace, Hydro Flame AFM Series Furnaces AFMD16/AFMD20/AFMD25/AFMD30/AFMD35

Where to look and what to record

  • furnace model
  • thermostat setting
  • LED flash count
  • lockout state

Code table

CodeWhat the manufacturer saysListed for
1 flashOne flash with a pause as a limit switch or airflow problem. / Limit switch or airflow problemsDometic DF series furnace; Dometic Hydro Flame AFM series furnaces
steady onInternal circuit board failureDometic DFSA / DFSD / DFMD / DFLD / DFLA furnaces; Dometic Hydro Flame AFM series furnaces
2 flashesA flame sense faultDometic DFSA / DFSD / DFMD / DFLD / DFLA furnaces; Dometic Hydro Flame AFM series furnaces
3 flashesAn ignition lockout faultDometic DFSA / DFSD / DFMD / DFLD / DFLA furnaces; Dometic Hydro Flame AFM series furnaces
4 flashesHigh voltage 16 V-17 VDometic DFSA / DFSD / DFMD / DFLD / DFLA furnaces
5 flashesLow voltage 8 V-9 VDometic DFSA / DFSD / DFMD / DFLD / DFLA furnaces

Do not operate with blocked vents. Shut off the furnace and LP gas if flame, soot, heat, or exhaust conditions look wrong.

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.

Troubleshooting guides

Official manuals and support pages

DometicDometic DF Series Furnace Installation ManualDometicDometic Hydro Flame AFM Series Furnaces Technical Installation Manual 32471