Furrion FWHO42SB1 (tankless) error code E8
Fan speed exceeds normal operating range - the flue fan over-speeds. Causes: exhaust vent obstruction, flue blockage, or a fan motor fault; or a fan motor / control board fault. CONFLICT with the FWH09 family: FWH09 E8 is an air-pressure-switch failure; this 6 L unit reports fan over-speed under E8.
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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- Furrion 6L Tankless Gas Water Heater Instruction Manual - FWHO42SB1 (Lippert PN 2026079760), CCD-0011284 V1.0 Rev 09-12-26Furrion (Lippert)
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