Thermostat shows E17 and internal humidity reading is missing or incorrect

Safety first: Turn off power to the HVAC system at the breaker before removing the thermostat.

• Step 1 – Reboot thermostat: Power cycle the system and check if E17 clears.
• Step 2 – Clean sensor vents: Remove the thermostat and gently clean the vent openings with a soft brush or compressed air to remove dust that may affect the humidity sensor.
• Step 3 – Compare humidity: Use a separate hygrometer in the same room to compare readings. If the thermostat reading is extreme or E17 persists, the sensor is likely faulty.
• Step 4 – Replace thermostat: The humidity sensor is typically integrated and not replaceable separately. Install a new Amana smart thermostat if humidity control is required (for dehumidification or humidifier control).

When to call a professional: For systems using humidity-based control of Amana equipment, have a technician verify correct operation after thermostat replacement.