If It has been over 6 weeks since my return was electronically accepted and I have not received my return how can I find out what the problem is?

Please be aware that Federal refunds can take longer than 21 days to process for the following reasons:

If you claimed an EITC and or ACT and filed before February 15, 2018.  

 https://ttlc.intuit.com/questions/3397970-path-act-may-delay-refunds-for-early-filers

The IRS processed a refund offset.(view link below)

https://ttlc.intuit.com/questions/2539782-what-is-a-refund-offset

• There were errors, inconsistencies, or missing info on the return.
• The return is under review.
• The IRS suspects identity theft or fraud.
• There's a Form 8397 (Injured Spouse Allocation) on your return.  It takes 11-14 weeks to process.
• You filed Form 1040-X (Amended Return), which can take 12-16 weeks to process.https://ttlc.intuit.com/replies/3302084