Thermostat displays E19 and indicates internal sensor calibration error; temperature and humidity readings may be locked

Safety first: No electrical work is required.

Steps to address E19 calibration error:

• 1. Factory reset: Perform a full factory reset from the installer menu. This may reload default calibration values.
• 2. Update firmware: Connect to Wi‑Fi and check for firmware updates that may correct calibration issues.
• 3. Compare readings: Use a reliable thermometer and hygrometer next to the thermostat to compare readings. If they are consistently off by a large margin, calibration is likely invalid.
• 4. Check for offset settings: Some Goodman thermostats allow user offsets for temperature and humidity. Adjust these to bring readings closer to actual values.
• 5. Replace thermostat: If E19 persists and readings are unusable, the internal calibration data or memory hardware is likely irreparable in the field. Replace the thermostat.