How to correct when the Independent Zone Controller point never restores to normal.
The panel point that uses a D279 or D279A never shows normal even though the Independent Zone Controller points are all normal.
What would cause the Armed LED to not function on an LED Command Center, while arming the system?
To correct the Armed LED try the following steps:
1. Recycle power to the command center, and the panel.
2. Readdress the command center, anything other than address one. Then reprogram the command center for the same address number, and reset the panel.
Why is the green LED not lit on the 251 keypad?
The green LED monitors loop status, power supply, and the fuse on the panel. If the LED is shut off check all of the above. Note: zones are supervised with a 1K ohm resistor and 16.5VAC 20 VA transformer is used for AC power.