Low or no water flow
Confirm that the cartridge is fully seated and locked, the water supply is open, and the correct LT800P code was installed. Air in the line can cause temporary sputtering during the required flush.
Leak at the housing
Stop dispensing, remove the cartridge, inspect the sealing surfaces for packaging, debris or damage, and reinstall without tools or excessive force. Persistent leakage requires the model-specific service instructions.
Filter light remains on
The compatibility source verifies the filter match, not the control-panel procedure. Use the LSC22991ST owner’s manual for the exact reset-button sequence.
Fit evidence
LSC22991ST is listed for this filter in a published refrigerator-filter compatibility chart. Re-check the full appliance label before ordering.