Navien E441 Error Code
Hotwaterinlet2:thermistoropen ContactTechnicalSupportat1-800-519-8794. or short.
Source: npn-199e__navi-npn-199e-english-iom.pdf
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Cold water inlet2:thermostat Contact Technical Support at 1-800-519-8794. openor
Abnormal operation:water ContactTechnicalSupportat1-800-519-8794. adjustment val
Abnormal operation: circulation External: Ensure that all watersupply and return