Aqua-Hot AHE-600-D04 error code FUEL-CONSUMPTION-EXCEEDS-0.41-GPH
AHE-600-D04 fuel consumption measured above 0.41 gal/hr nominal at full burn rate. Indicates over-firing - most often from incorrect (larger) fuel nozzle installed or mis-set air shutter producing rich combustion.
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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- AHE-600-D04_Service_Manual.txtAqua-Hot Heating Systems