What do the error codes E1, E2, and E3 mean on the RTH5160D1003?
Error code E1 indicates a system error, E2 indicates a sensor error has been detected, and E3 indicates a wiring issue. If an alert icon appears on the display, you can press the 'Next' button to view the alert code and its description. If issues persist, consult a qualified HVAC technician.
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