John,I think he/she is talking about the cartridge -If you are talking about the cartridge,pull it again. check the Cartridge and the Valve for debris. With the cartridge removed, clean the Valve with a 1" fitting brush if it's a posi-temp valve - if it's a Chateau use a 3/4" brush, turn the brush clockwise going in and out of valve to remove any buildup inside valve. Valve will need flushing out - place something around valve so water does not get in wall or splash out shower,turn water on for a few seconds to flush. Lubricate cartridge and reinstall.