Your ‘contractor’ has probably ruined your brand new windows and will slowly ruin your house. Flagrantly wrong installation that goes against the instructions and building code. He owes you new windows. I’m guessing you didn’t pull permits and he probably isn’t licensed?

As to remedy hopefully you haven’t paid him anything, hire a new contractor (that will probably cost much more) to demo what is there, try to save the windows, and rebuild properly.

Andersen's website has a page for their certified installers. I will link it. As said above, you will need to pay more for the installation, but a certified installer means "buy once cry once", instead of what you are now dealing with - not just the cost but the stress, aggravation and potential ancillary damage to your home.

https://locations.andersenwindows.com/andersen-certified-contractors/

That is my fear. He did the same on the second floor windows but they may be more savagable.

We worked with an architecht who submitted plans to the NYC DOB for our renovation. NYC DOB approved those plans, he applied for the permits to those plans, and he went rogue and didnt follow them once on site. He built and performed alterations on homes 3x the size of ours. He was licensed. Insured is another issue because while he technically has insurance, he has a bare bones policy, and he isnt insured for the type of work that he is doing, especially on our home.

We also hired special inspectors that we paid but they didnt show up till AFTER the job was almost complete, so they didnt protect our interests and should have seen that he wasnt building to plans - didn't apply the Blueskin/Vapor Barrier, substiuted the masonry ties with ones that are non code compliant...the list can go on!!

We didnt take any short cuts. We looked in to the contractor and asked around, got a certificate of insurance and hired professionals, but what we got in the end was a mess!!

@M Miller, we had the instructions on site, including the manufacturer's instructions that remained attached on the windows long after the window installation. He didnt look at anything and did it his way. "I know how to do this, I do this for 40 years!!" As you can see, this wasnt a replacement window situation, too. It was a big, rough opening. In other parts of the house, we went with Anderson Renewals - talk about a premium - but they're installed properly. This guy was a CONtractor!

I don't see that as being probable here.

We have a big issue here, clearly.