Crj-200 pilot reported an unsafe gear indication after takeoff.

Attributes
ACN	1565044
Time
Date	201808
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZZ.Airport
State Reference	FO
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Indicating and Warning - Landing Gear
Person 1
Function	Captain Pilot Not Flying
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Weight And Balance

Narrative:

Upon take off we received a red warning gear disagree message. We ran the QRH and diverted into ZZZ1 due to being several thousand pounds overweight to land back at ZZZZ. We landed at ZZZ1 without incident. There were no injuries and calls were made to operations shift manager and maintenance to inform of the situation. Cause: defective nose gear indication sensor.

Original NASA ASRS Text

Title: CRJ-200 Pilot reported an unsafe gear indication after takeoff.

Narrative: Upon take off we received a red warning gear disagree message. We ran the QRH and diverted into ZZZ1 due to being several thousand pounds overweight to land back at ZZZZ. We landed at ZZZ1 without incident. There were no injuries and calls were made to Operations Shift Manager and Maintenance to inform of the situation. Cause: defective nose gear indication sensor.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.