Dometic DF Series error code 3 flashes with 3 s pause
Ignition lockout fault (SOFT lockout, ~1 hour retry) - the control tried ignition three times and failed; it soft-locks for about an hour then retries.
What to check, and in what order, is in the app. The flow Dometic DF Series furnace - LED flash code lookup walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
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- Dometic DF Series Furnace (DFSA/DFSD/DFMD/DFLD/DFLA) Installation Manual (81452 AMER3)
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