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Fogatti error code E8

WarningWater Heater — TanklessVerified against the manufacturer's manual

Wind/air-pressure switch failure (IS7/IS8 Pro - mechanical pressure switch): switch closed when powered for 5 s, or continuously disconnected for 2 s. On the newer DC-fan 9Pro/Ultra (FS10B1S), E8 instead = the fan speed exceeds the current load limit for 5+ s (these models have no wind-pressure switch).

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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