How do I repair a leaky Moen faucet handle. When I

Question edited for correct spelling of maker 'Noen' to 'Moen'.

'Fix' as in it is leaking? Or tighten it down because it is wobbly, or something completely different?

Moen One-handle Replacement Cartridge -- 1225

MOEN https://www.moen.com > products > Moen > 1225 From finishes that are guaranteed to last a lifetime, to faucets that perfectly balance your water pressure, Moen sets the standard for exceptional beauty ...
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M-Line Moen cartridge -- M1225

Moen https://www.moen.ca > products > M-Line > M1225 Moen Cartridge · Designed for 1 Handle lavatory, kitchen and tub/shower faucets (after 1959) · Replaces O.E.M. 1225 · Backed by MOEN's limited lifetime warranty.

MOEN #1225 Single-Handle Faucet Cartridge

Home Depot https://www.homedepot.ca > ... > Faucet Cartridges
It maintains a balanced pressure of hot and cold water. This cartridge assembly is ideal for Delta Monitor 1300 and 1400 series tubs and showers. See less ...
In stock

Moen 1225 One-Handle Kitchen and Bathroom Faucet ...

Amazon.ca https://www.amazon.ca > Moen-1225-One-Handle-Repl...
Replacement faucet single control cartridge; Fits all single-handle kitchen, lavatory, tub, and shower Moen and Stanadyne faucets; Eliminates hard pull ...
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Call Moen directly. They will ship what you need to your door, for free.

if memory serve's me,you will need to remove a stem extension,screw in center,and you may need a tool #103462 to remove cartridge.1'st stem ex't is red,(hot) blue (cold), remove, look down,white piece w/ 2 notch'es, this hold's cartridge down, ya might try needle nose plier's to remove,a little lube help's upon re assembly, carefull w/plastic thread's

This might mean that the diverter in that controls the sprayer needs replacing. It is located behind the valve body underneath the tub spout sleeving

Call moen and give them your model no. they will send you a new cartridge free of charge. if you can't wait local stores like lowes will have them. Turn off your main water shut off valve and take off handle, then with some pliers take off brass ring, the cartridge will pull out. First notice the notch it rests in and notice where the hot water adjustment disc is. Assemble the new one the same way, put some vasolene on orings and reassemble. hope this helps.

Single or dual lever? A new ball if single lever. Home Depot or Menards will carry them. Teflon tape if dual cartridge. Stay away from moving parts

the cartridge if defective,replace it and your leak will stop.

Try replacing the cartridge first.That's your best bit . Next would be the whole valve. Hopefully, it's just the cartridge.

hi... yes that's a very common issue with moen "cartridges" -- it's very simple to fix..... grasp the handle and give it a gentle tug upwards when the water is on... if it retracts again, pull the handle out again and tug again but this time a bit harder. Not sure what causes this on new cartridges but it will fix your issue.

The plumber soldered in the faucet without removing the cartridge, the o-rings are melted. Have the builder replace the o-rings.