If the temperature sensor is reading out of specification (+/- 2 degF), the sensor will need replacing.

To replace under warranty, please visit: www.AmbientWeather.com/rma.html

For out of warranty replacement sensor:

WS-1171, WS-1171A, WS-1172, WS-1173, WS-1173A:

https://www.ambientweather.com/amwh3.html

WS-1171B:

https://www.ambientweather.com/amwh2f.html

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