Leaky faucet
This is generally due to a loose or faulty cartridge. To fix:
1. Turn off water supply valves under sink.
2. Block the sink drain to avoid losing small parts.
3. Remove faucet handle. It is attached by a set screw, an odd size (I actually used a T9 torx screwdriver successfully, even though the set screw is hex head, since I did not have a matching allen key). The set screw is quite far into the handle, ~3cm, through a hole in the bottom of the handle. Depending on your countertop layout, you may have to actually remove the entire faucet from the countertop in order to get access to it, in which case follow the appropriate parts of your faucet installation directions in reverse.
4. Remove dome. It will come off with a gentle turn/pull.
5. Check the tightness of the exposed large hex nut. This is the piece that holds the cartridge in place. If you are lucky, it is just loose, and that's your problem; otherwise you will need a new cartridge.
6. Unscrew that nut, remove. Pull out the cartridge.
7. Replacement cartridges may be found at your local Moen dealer, or may be ordered directly from Moen +1-800-Buy-Moen. Parts are free due to the lifetime warranty. Part #1255 includes the cartridge, cartridge nut, and set screw. The nut must be changed with the cartridge (presumably due to its wear characteristics).
To reassemble:
8. If you have it, place a very small amount of plumber's silicone lubricant on the back of the cartridge, on the rubber seals around the three holes.
9. Assemble in reverse order of disassembly. The cartridge only goes in one way, due to three guiding channels on its perimeter.
Enjoy!
×