Sash cord snapped if your sash cord snapped and the sash has twisted in the frame becoming stuck firmly then you are in luck this is the easiest fix.
Sash window weights stuck.
Remove the window and then open the panel cover on the side jambs to access the sash cord weight and pulley.
Pry the old sash cords from the sides of the window sash.
For a window without access panels you also need to remove the window casing.
Your sash windows have been freshly decorated and there is no longer room in the frame to travel lower down if you ve pulled the window forcefully it s now stuck firm.
Windows old enough to have sash weights have probably seen a variety of painters of various skill.
Pull one of the sash cords until the sash weight hits the pulley then lower the weight about 3 inches.
How to replace window sash weights accessing the weights.
Prying off the window trim may or may not give you access to the weights but you won t know.
Tie the sash weights onto the new cords and drop them back inside the wall.
Set the sash partially into the window opening.