Aqua-Hot AHE-400-D02 error code HEAT CALL USES DIESEL ON SHORE POWER
Customer reports the diesel burner runs even when the unit is connected to shore power and the AC element should be doing the work. May be normal sequencing behavior in cold weather, OR may be an actual sequencing failure or customer-misconfigured AC delay.
What to check, and in what order, is in the app. A step-by-step flow walks this code 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 400D Use & Care GuideAqua-Hot
- Aqua-Hot Heating Systems Service Manuals — aquahot.com
- Aqua-Hot Tech Support 800-685-4298 (Fort Lupton, CO)
- AquaHot 400 D02 Diesel Plus AC Hydronic Technician Service Diagnostic Reference (rv-tech-resources/54-aquahot-400-hydronic/AquaHot_400_D02_Diesel_Plus_AC_Hydronic_Technician_Service_Diagnostic_Reference.md)
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