La Crosse Technology 308-2408FR, Faqs

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Side-by-side test: Place the outdoor sensor right next to the weather station for 2
hours.
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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 weather station, try a
different location outside.
Intermittent Outdoor Temperature
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 weather station is reading the correct outdoor sensor
(not a neighbor’s sensor). Place the outdoor sensor in the freezer for an hour and
watch the temperature drop on the weather station.
Indoor distance test: Please complete the Restart with outdoor sensor and
weather 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 weather 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.