A sash that drops often points to a failed balance, spring, or connection. A window that closes but will not lock may have alignment, keeper, or frame problems.
Do not rely on a stick to hold a heavy sash or open a tensioned balance assembly. Record the symptoms and have the system inspected.
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Typical balance-system symptoms
A sash that becomes heavy, lifts on one side, or drops after opening often has a balance or connection failure.
Uneven support can tilt the sash and damage the channel, so forcing it may increase the repair scope.
A locking problem may not be a bad lock
Window locks depend on proper sash alignment. Frame movement, compressed seals, or a sagging sash can keep the lock from reaching its keeper.
Alignment should be checked before replacing hardware, or the new lock may bind as well.
Repair or replace the hardware
When the system can be identified and the frame is sound, matching balances, keepers, and handles can often be replaced.
Obsolete hardware, repeated failures, or worn frames call for a comparison between adaptation and full replacement.