Aqua-Hot AHE-400-D02 error code Ignition Failure
Reporter displays 'Ignition Failure' -- the Webasto WPX-909-180 diesel burner attempted ignition but no flame was detected by the photo-eye within the trial window. As on the 250-D03, photo-eye contamination is the most common root cause -- on the 400-D02 also consider Webasto-specific modes (fuel pump check valve, Webasto-spec fuel filter).
What to check, and in what order, is in the app. The flow Webasto burner won't start (diesel indicator light off) 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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- Aqua-Hot AHE-450-DE4 Service Manual (Webasto WPX-909-180 burner; photo-eye test: over 100K covered, less than 200 in light)Aqua-Hot
- Aqua-Hot 400-P02-D02-DW2 Use & Care (Reporter)Aqua-Hot
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