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Troubleshooting

3

I

ntercom does not function.

 

Check batteries in intercom. If using a DC Adapter 
ensure that it is plugged in.
Ensure intercom is connected to a network. 
See Programming Intercom.
Ensure that intercoms are on the same channel. 
See Operation & Features.

I

ntercom is not getting expected transmission 

range.

Keep antenna vertical. Keep intercom away from 
metal objects and electrical wiring. Cell phones, 
cordless phones, or other radio devices may also 
limit range.

I

ntercom beeps every ten minutes.

The battery is low in the intercom. Replace with 
AA Alkaline batteries or operate it with DC Adapter 
(not provided). A 12 volt, 300mA DC Adapter may 
be used (center positive polarity on the round plug).

Static and feedback is heard in intercom.

The intercoms are too close to each other. A cordless 
phone, cell phone, or other radio devices can also 
cause static.

T

he intercom does not connect to another 

intercom and a green light is on longer than 

3

-

1

/

2

 minutes

.

The intercom is out of range. Place the intercom 
closer to the other intercoms in the network, with the 
antenna pointing up.
The other intercom in the network has no power. 
Replace the batteries.
The intercom has not completed programming.
Clear the intercom's memory and reprogram.

N

eed to clear intercom’s memory.

Press and hold Learn button, an initial beep will be 
heard. Continue to hold until a second beep is heard 
(about 6 seconds). Ensure other intercoms are not 
activated during this time. Once memory is clear the 
intercom can be programmed to a new network.

I

ntercom is sending audio while no buttons are 

pressed.

The sending intercom is set to Monitoring Mode or Voice 
Activation Mode and will activate when sound is heard. 
It can be taken out of Monitoring Mode by pressing the 
Talk button. It can be taken out of Voice Activation Mode 
by setting Dipswitch #1 to DOWN position.
See Operation & Features.

I

ntercom can not be programmed to network.

A network may contain up to 12 intercoms or doorbells. 
It may be necessary to clear the network and 
reprogram all the intercoms to the network. 
See Programming Intercom.

NOTE:

 Manufacturer is not responsible for any radio or 

TV interference caused by unauthorized modifications to 
this equipment. Changes or modifications not expressly 
approved by the manufacturer could void the authority to 
operate the equipment.

Summary of Contents for LiftMaster 833-1LM

Page 1: ...If a specific channel is selected for Monitor Mode then only other intercoms on that channel or on the paging channel can listen Press the Talk button to exit Monitor Mode A tone will be heard indicating Monitor Mode is no longer active Voice Activation Mode VOX Voice Activation Mode VOX allows a call to be answered without pressing the Talk button Once a call is heard on an intercom which has bee...

Page 2: ...e refer to table below Press and release the Talk button to verify network is complete INTERCOM LEARN MODE Press the Learn button until a beep is heard OR Each intercom will emit a tone when entering programming mode It may take up to 3 1 2 minutes for a secure network to be established Repeat for any additional intercoms M ON IT OR HO LD OF F 1 3 2 4 V O LU M E TA LK A C TI VE M ON IT OR HO LD OF...

Page 3: ... the antenna pointing up The other intercom in the network has no power Replace the batteries The intercom has not completed programming Clear the intercom s memory and reprogram Need to clear intercom s memory Press and hold Learn button an initial beep will be heard Continue to hold until a second beep is heard about 6 seconds Ensure other intercoms are not activated during this time Once memory...

Page 4: ... comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications Ho...

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