Are you sure that these are Anderson windows? Most Andersons manufactured in the recent past use a clock spring mechanism in the window head to counterbalance the sashes.
If your window does have sash cords running into the jambs, it probably uses metal counterweights in the wall. Carefully remove the vertical facing trim (the trim board between the frame and the wall). Inside the wall you will find a vertical space containing a metal weight tied to the end of the sash cord. It is likely that the weight has hung-up on something. Clear the obstruction and check the window operation. If the sash operates smoothly you have fixed the problem. Replace the trim, putty stop the nail holes, and paint.
While the trim is off you might want to install a new sash cord. This entails a lot more work including removal of the sash itself. There are books at your local builders store explaining this operation in more detail and with pictures.
Good Luck |
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