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© 2008, The Chamberlain Group Inc.
114A3530B All Rights Reserved
NOTICE: To comply with FCC and or Industry Canada rules (IC), adjustment or modifications of this receiver and/or transmitter are prohibited,
except for changing the code setting or replacing the battery. THERE ARE NO OTHER USER SERVICEABLE PARTS.
Tested to Comply with FCC Standards FOR HOME OR OFFICE USE. Operation is subject to the following two conditions: (1) this device may not
cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
FOR TECHNICAL SUPPORT DIAL OUR TOLL FREE NUMBER:
1-800-528-2806
www.liftmaster.com
Troubleshooting
Dial tone is not heard after connecting to the OTIU.
Check phone connections. If it is a two-line phone
ensure it is on Line 1.
If a dual-tone error tone is heard when trying to open
gate, ensure OTIU is programmed to the correct
GAPLM, DAILM, or Intercom. Check that gate operator
has been taught to master unit as well.
If OTIU has already been programmed and will need to
have memory cleared (see below).
Memory needs to be cleared.
Clearing OTIU memory will not clear any OTIU settings
or programmed phone numbers. To clear memory, dial
“**#8” on the telephone connected to the OTIU. A beep
will be heard.
To clear DAILM memory, set Dipswitch #1 to the
DOWN position, then press the Learn button until a
beep is heard (about 15 seconds).
When dialing numbers a dial tone is heard.
All numbers and symbols must be dialed within 3
seconds of each other, otherwise the OTIU times out
and returns to dial tone.
OTIU is not getting expected transmission range.
When used in buildings with stucco or cement walls, the
range is greatly reduced. The Repeaters can be used
close to the building to solve this problem.
Keep OTIU away from trees, metal objects, masonry,
computers, and any other “Radio Noise Source”. Radio
devices that run on 900 Mhz also affect range. Turn
them off and see if reception has improved.
Keep antenna vertical.
After dialing “*9” a beep is heard, then an error tone.
Check batteries in GCU.
Will not accept command after dialing “**”.
Check the line and telephone connections.
Telephone does not ring when Call button is
pressed.
If the Active LED on OTIU flashes after Call button is
pressed, check telephone connections.
If the Active LED on OTIU does not flash after the Call
button is pressed, see Programming Accessories to
ensure OTIU is programmed correctly.
There is a buzzing or failed connection when call is
answered.
Move OTIU away from phone and/or computer. Try
changing channel of OTIU and/or the channel on the
GAPLM (see Gate Access Panel manual).
Only first couple of words from caller are heard.
Lower the GAPLM microphone sensitivity (see Gate
Access Panel manual).
PIN Number Functions
Number Function
**01 Enable Call Forwarding
**02 Disable Call Forwarding
**07 Activating the OTIU
**06 Verify Call Forwarding Number
**#8 Clear Memory
*9 Activate Gate
**102 - **105 Change number of rings
*#(Phone Number)# Program call forwarding
number