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If the Moen Positemp cartridge will not come out, you may need to get a special tool to remove it.
Unlike other Moen cartridges, the Positemp will not work properly if it is installed upside down, Note: A Plumber from New Jersey was kind enough to point out, If the water lines have been been installed backwards in the walls, (the hot water pipe on the right instead of on the left as per the plumbing code) you will need to have the HC markings on the faucet facing down for the faucet to work correctly, 

Moen Positemp cartridge Repair b