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This is a question that will drive the average DIY person crazy, but when you hear the answer it makes sense.... The single handle style Moens are great faucets, and I use and like them. If your builder used them throughout your home then this is what you do.... find your water heater and visualize the furthest away faucet (include all your sinks that have Moen faucets - utility/slop sinks, as well) start with the furthest sink and work your way back to the source, testing each faucet to see if it has the same problem. The ones that do will be the sink you work on first, the cartridge must be replaced on each, and here is why.

The construction of the cartridges can partially fail allowing hot water to leak into the cold water lines and visa versa the problem is that since your house was built with all Moen faucets that if you only replace one cartridge you will "chase your tail" trying to fix the problem and they are all going to fail eventually.

So consider replacing them all at the same time (I did! and Yes it does cost a lot) and the problem will go away. Sorry, but Good Luck!

Douglas

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Q: What would cause cold water to pass through the hot water supply line behind a single handle moen bath and tub faucet affecting the water temperature?
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