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Thread: Moen kitchen faucet - low flow problem

  1. #1
    DIY Member dirtmover's Avatar
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    Default Moen kitchen faucet - low flow problem

    I've got a Moen kitchen faucet whose flow is a bit temperamental sometimes slowing to a trickle. I picked up a replacement 1225 cartridge assuming that there was some issue with it but alas this made no difference. I did however notice when the flow from the tap slows if I use the hand spray it works full force and the flow coming out of the tap actually increases at that point. When I stop using the hand spray the tap continues to flow at the normal flow rate. This fix is short lived however as over a period of time it will slow back down again.

    What is going on with my faucet and how can I fix it.
    Last edited by dirtmover; 11-10-2013 at 02:31 PM.

  2. #2
    DIY Senior Member Reach4's Avatar
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    Unscrew the aerator and clean the filter screen.

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    DIY Senior Member dj2's Avatar
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    What kind of pipes do you have in your plumbing system?

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    DIY Member dirtmover's Avatar
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    Yeah, should have mentioned the aerator is clear.

    Supply pipes are 1/2" copper. Pressure is fine - well water 30/50psi.

    All other faucets OK.

    Behaviour is the same with full hot, full cold or half and half.

  5. #5
    Moderator & Master Plumber hj's Avatar
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    From the way the sprayer affects the flow, you have a defective diverter inside the faucet. Where it is, however, depends on which model you have.
    Licensed residential and commercial plumber

  6. #6
    DIY Member dirtmover's Avatar
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    Quote Originally Posted by hj View Post
    From the way the sprayer affects the flow, you have a defective diverter inside the faucet. Where it is, however, depends on which model you have.
    Thanks, this is exactly the conclusion that I was coming to after doing a bit more reading this morning. I know exactly where it is. I popped it out yesterday and cleaned the scale off it and from the mating surface in the spout, greased the o-rings with silicone grease and put it back together. It looked fine but I've not figured out how this part works so I don't really know what to look for? What breaks with them and how do you tell if they're defective other than observing the symptoms? The only wear part I see is the o-rings.

  7. #7
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Replace it. In the mean time you can just leave it out. It will help your volume problem but it just won't turn the spout off when using the spray.

    John

  8. #8
    DIY Member dirtmover's Avatar
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    Quote Originally Posted by johnjh2o1 View Post
    ....but it just won't turn the spout off when using the spray.
    No change there then. It doesn't turn the spout off anyway instead making the flow better out of the spout when the spray is on.

    Thanks for the tip. If Home Depot don't stock it I'll just remove it until I get a chance to visit the local plumbing supply store.

  9. #9
    Moderator & Master Plumber hj's Avatar
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    As long as you know WHAT you need, call 1-800-BUY-MOEN and they will send you a replacement. I have NEVER had any luck cleaning or repairing diverters once they start to malfunction.
    Licensed residential and commercial plumber

  10. #10
    DIY Member dirtmover's Avatar
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    Thanks guys, my free warranty replacement diverter valve is on its way. I'm sure that will fix it.

  11. #11
    DIY Junior Member robert13084's Avatar
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    Thats definitely the problem.

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