Aqua-Hot error code INDICATOR LIGHT RED
On the Heating Zones / Pumps / Electric Element status lights specifically: electrical overload condition (short circuit) in that component's circuit (auto-restarts once corrected). NOTE: this same Aqua-Hot electronic controller has other RED lights with DIFFERENT meanings and remedies — Low Tank-Level Cutoff (low fluid; auto-resets after refill, no wiring hunt needed) and Low Battery Voltage Fault (12VDC too low; requires a MANUAL reset via the controller's reset button after voltage is restored). Identify which specific light is lit before following a remedy.
What to check, and in what order, is in the app. The flow Aqua-Hot Reporter — Fault Screen Triage 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 400D Use & Care GuideAqua-Hot
- Aqua-Hot Heating Systems Service Manuals — aquahot.com
- Aqua-Hot Tech Support 800-685-4298 (Fort Lupton, CO)
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