What to do if 28V LED doesn't light on Bell System Intercom System controller?
- DDaniel HicksAug 31, 2025
If the 28V LED does not light on the controller of your Bell System Intercom System: * Temporarily remove the connection to the 28V+ output. If the LED then comes on, there is a short on the phone cabling. * Check that the 12V input connections are not reversed or missing.




