Furrion FWHO42SB1 (tankless) error code E3
Over temperature mechanical sensor faulty - the water over-temperature switch (ECO switch / thermostat, parts item 19) has acted. The manual's own first step: let cold water flow 10~20 s, then restart the appliance.
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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