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La Crosse Technology, Ltd. www.lacrossetechnology.com/support Page 4
The outdoor sensor reads the environment where it is mounted. When mounted inside the home, it
will read inside temperature/humidity.
When the outdoor sensor reads high during the day, but not at night, it is a positioning problem.
Look for heat sources such as sunlight, door or window frames or reflected heat.
Side-by-side test: Bring the outdoor sensor in the house and place it next to the forecast station for 2
hours.
Compare indoor and outdoor temperature. The temperatures should be within 4 degrees to be within
tolerance.
If the outdoor sensor reads correctly when next to the forecast station, try a different location outside.
Intermittent Outdoor Temperature/Humidity
Explanation: Intermittent problems are the hardest to resolve. RF (radio frequency) communication may
come and go occasionally. This can be normal in some environments (e.g. moister climates). If outdoor
sensor signal is lost, please wait 2-4 hours for the signal to reconnect on its own.
Move the outdoor sensor to a closer location.
Distance/Resistance can cause loss of outdoor sensor signal.
Check Batteries.
Freezer test: Confirm the forecast station is reading the correct outdoor sensor. Place the outdoor sensor
in the freezer for an hour and watch the temperature drop on the forecast station.
Indoor distance test: Please complete the Restart with outdoor sensor and forecast station 5-10 feet
apart and inside to establish a strong connection.
After 15 minutes, if there is a reading in the outdoor temperature area, move the outdoor sensor to
another room with one wall between the outdoor sensor and the forecast station.
Observe to see if the temperature remains on consistently for 1 hour.
If the temperature remains on while in the house, then it is likely a distance/resistance issue.
Move the outdoor sensor to different locations outside to find a location where the temperature
reading will hold.
Outdoor Temperature is stuck or HH.H, LL.L
Explanation: These symbols are error messages indicating the outdoor sensor is outside of its readable
range.
Check Batteries. Overpowered or underpowered batteries can cause this reading.
Replace outdoor sensor.
Note: The last outdoor reading may remain (not change) for several hours when connection is lost. The
outdoor temperature reading will flash when the connection is first lost or intermittent.
Outdoor sensor drains batteries quickly
Test a new set of alkaline batteries. Write down the date of installation and the voltage of the
batteries.
When the batteries fail, please note the date and voltage again.
Check the distance and resistance between the outdoor sensor and forecast station. Outdoor sensors
at the end of the range may work while batteries are fresh but not after they drain a bit.
Check for leaking batteries, which may damage the outdoor sensor.
Battery life is over 24 months when using reputable battery brands for both Alkaline and Lithium
batteries.
Outdoor sensor fell. The sensor no longer works
Explanation: If there is no physical damage to the outdoor sensor, the fall may not have caused internal
damage. A fall can shock the outdoor sensor or the batteries in the outdoor sensor. Batteries that have
fallen on a hard surface may be damaged and unable to function properly.