Transmitter Signal Not Recieved

Issue: 

1a. Transmitter not properly powered.
1b. Transmitter is located too far from RF
receiver.
1c. There is metal shielding between
transmitter and RF receiver.
1d. Transmitter is malfunctioning.
1e. Transmitter No. (zone) is not
programmed. 

Possible Fix:

1a Check or change the transmitter's battery.
1b. Move the transmitter or RF receiver.
1c. Check for large metal obstructions, then relocate
transmitter if necessary.
1d. Verify by activating control with another,
similar transmitter. If O.K. now, return
the defective transmitter.
1e. Verify programming.