Dometic furnace · 2 model lines
Dometic furnace code 1 flash: Limit switch or airflow problems
Dometic documentation for 2 model lines lists 1 flash as “Limit switch or airflow problems”.
Check your model first. The same code can mean different things on different models. Find the model number on the appliance's data label, then use the matching row below.
What code 1 flash means by model
| Model line | What the manufacturer says | Source |
|---|---|---|
| Dometic DF series furnace | The DF furnace manual identifies one flash with a pause as a limit switch or airflow problem. | Dometic DF Series Furnace Installation Manual |
| Dometic Hydro Flame AFM series furnaces | The Dometic Hydro Flame AFM technical installation manual lists 1 flash with a 3-second pause as limit switch or airflow problems. | Dometic Hydro Flame AFM Series Furnaces Technical Installation Manual 32471 |
What you can safely check
- Turn the furnace off.
- Check that interior registers and exterior intake/exhaust openings are unobstructed.
- Do not restart if vents were covered, soot is present, or the furnace smells unusual.
Stop and call a technician for
- Limit-switch, airflow switch, burner, board, or combustion diagnosis is qualified RV furnace service work.
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.
Write this down before you call
- furnace model
- thermostat setting
- LED flash count
- lockout state
Other codes on Dometic DF and Hydro Flame AFM furnaces
Full table: Dometic DF and Hydro Flame AFM furnaces