Suburban error code 3-trial ignition lockout
Three failed Trial-For-Ignition attempts — module board has de-energized the gas valve and gone to lockout. The blower runs for 3 minutes and then shuts down in lockout mode (all module boards).
What to check, and in what order, is in the app. The flow Suburban furnace — 3-trial ignition lockout diagnostic 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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- Suburban RV Furnace Service & Training Manual (form 3850, rev 11-05-2015)Suburban (Airxcel)
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