Control Company 4115 RADIO-SIGNAL REMOTE THERMOMETER - Manual (Page 16)

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Remove the back panel of the remote transmitter. Remove the batteries,
wait 20 seconds, and put them back in the unit. Then, using a stylus or
straightened paper clip, press the RESET button. Observe on the remote
transmitter LCD a momentary reset to “888” on the display, release the
RESET button.
Place the batteries in the main receiver unit. Replace the battery cover.
Using a stylus or straightened paper clip, press the RESET button on the
main receiver. Observe on the receiver LCD a momentary reset to “888” on
the display, release the RESET button.
First make certain that the unit will pick up a nearby signal. Do this by
placing the remote transmitter in a vertical position. Place the main receiver
(large digital display) in a vertical position approximately 6 feet away from
the remote transmitter. There should be no obstructions between the units.
Make certain the main receiver is set to the correct channel. On the main
receiver simultaneously press the CHANNEL button and the MEM button.
This will force the main receiver to search for the signal. Again, make cer-
tain the main receiver is still set on the correct channel.
If the main receiver is now displaying the temperature from the remote
transmitter then the units are functioning correctly. These units will perform
within their limitations. All radio signals are inherently affected by interfer-
ence or blockage. Like all radio transmitters and receivers, performance
is best when there is little or no interference or blockage. Even the most
powerful megawatt radio station transmitter is occasionally blocked when
driving. Powerful cellular phones (which are simply radio transmitters/
receivers) still “drop” calls when interference or blockage occurs. On
occasion it is difficult or impossible to receive a cellular phone dial tone in
certain areas of a building.
Some of the causes of interference and blockage are metal, reflective
surfaces, motors, elevators, florescent lights with electrically noisy ballasts,
sparking environments such as welding, emergency vehicle radios, power
lines, portable/mobile radio transmitters and walkie-talkies.