Contoure error code E4
Thermostat (overheat sensor) failure - loose connectors or poor contact, sensor open/short circuit, or a faulty main controller.
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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