Corporate captain reported being unable to retract the flaps after takeoff.

Attributes
ACN	1573530
Time
Date	201808
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Rockwell North American Civil Twin Jet
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	Trailing Edge Flap
Person 1
Function	Captain
Qualification	Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 12575 Flight Crew Type 1700
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

We departed for ZZZ with 2 crew and 1 passenger prior to the tower opening and picked up our IFR clearance to ZZZ from [TRACON].preflight checks were normal; conditions were VMC; part 91 flight; owner on board.flaps 0 were selected climbing out of 400 feet however the flaps did not retract. We continued climb to a safe altitude; communicated with ATC and began working on the problem.we were unable to retract the flaps; canceled our IFR flight plan; requested VFR flight following and diverted to ZZZ1 which is where our maintenance base for this aircraft is as well as having a longer runway to deal with a potential flap issue on landing.1 of the 4 circuit breakers associated with the flap controls was apparently not fully seated. It's possible that a headset cord could have caught it. This breaker is not in a particularly good location for a visual inspection; moving forward we will check these breakers more closely should the situation arise again.

Original NASA ASRS Text

Title: corporate Captain reported being unable to retract the flaps after takeoff.

Narrative: We departed for ZZZ with 2 crew and 1 passenger prior to the Tower opening and picked up our IFR clearance to ZZZ from [TRACON].Preflight checks were normal; conditions were VMC; Part 91 flight; owner on board.Flaps 0 were selected climbing out of 400 feet however the flaps did not retract. We continued climb to a safe altitude; communicated with ATC and began working on the problem.We were unable to retract the flaps; canceled our IFR flight plan; requested VFR flight following and diverted to ZZZ1 which is where our maintenance base for this aircraft is as well as having a longer runway to deal with a potential flap issue on landing.1 of the 4 circuit breakers associated with the flap controls was apparently not fully seated. It's possible that a headset cord could have caught it. This breaker is not in a particularly good location for a visual inspection; moving forward we will check these breakers more closely should the situation arise again.

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.