Contoure error code FD
Cold Weather Anti Freeze operation - not a fault. The system is firing the burner to prevent freezing of water in the unit and will run until a safe warmer temperature is reached.
What to check, and in what order, is in the app. The flow Contoure AA-65KWO - error code lookup 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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- Contoure AA-65KWO Tankless Water Heater Instruction ManualContoure (National Quality Products, LLC)
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