Honeywell CENTRA LINE MERLIN NX Series - Controller LED Status; LED Status Interpretation

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
29 EN1Z-1076GE51 R0722
Controller LED Status
Table 12. Controller LED Status
Mode LED Status Visual
Firmware download Green blinks every 200 ms.
No application
a)
Red, Green, Yellow blinks every 1 s.
Broken sensor
Red permanent ON
b)
.
Short circuit
AutoMac Green blinks every 2 s.
No Valid Mac Yellow permanent ON.
Un Ack Alarm Yellow blinks every 2 s.
Normal operation Green LED permanent ON.
Communication error Red LED blinks every 200 ms.
a)
While performing setpoint balancing using the VAV mobile application, the LED pattern changes from static green to red, green, yellow
cycles (which indicates the controller is empty).
b) For troubleshooting a permanent red LED, navigate to IRM Program > On Board IO and check the UIO function block OutCase status.
A permanent red LED will be illuminated when the OutCase status is SensorOpen (broken sensor) or SensorClose (short circuit).