Kohler Forte Faucet Troubleshooting & Repair Guide

This Kohler Forte Faucet Troubleshooting & Repair Guide will give you easy to follow steps for troubleshooting and repairing Kohler Forte kitchen and lavatory faucets. If you are having problems with a Kohler Forte in most cases following these easy steps and replacing a few inexpensive parts can restore the faucet to operating like new again.

The Kohler Forte Faucets follow the same troubleshooting logic as any other faucet regardless of where they are located or, the number of handles with minor additional steps. If the faucet is not shutting off and continues dripping or, running with a steady stream the problem is almost always a cartridge that requires replacement. If you turn on the faucet and water comes out at a reduced flow or, not at all in most cases you will find the aerator on the end of the spout has clogged with debris and the flow is blocked, you can unscrew it and either clean or, replace the aerator. On kitchen faucets with a side spray that are not flowing you should check the aerator first for debris and if that does not fix the problem, check the side spray to see if it has flow while the spout doesn’t, which will indicate a problem with the diverter sticking. The diverter sticking can also be indicated by water coming out of both the spout and side spray at the same time. In some cases there may be other blockages an the supply lines or, valves coming to the faucet but in most cases you should start at the faucet as it is the easiest place to start checking.

Once you have figured out what parts are malfunctioning and require replacement you are ready to go to the next step of disassembling the faucet and replacing the parts. Before rushing in blindly it is probably a good idea to get a look at the service parts diagram for your faucet to get a picture of how the parts go together. This will help you to get an idea of how to take it apart and put it together again, along with being able to see what parts you will need to purchase and in some cases where only one part is used you can purchase them in advance. Other cases where 2 different parts are used you will have to disassemble to find out what is used on your faucet the buy the parts.

Kohler Forte Single Handle Kitchen Sink Faucets

The Kohler Forte Single Handle Kitchen Sink Faucets are all very similar and the same parts, disassembly and reassembly procedures for cartridge replacement apply to all of the models, which include model numbers K-10411, K-10412, K-10413, K-10414, K-10415, K-10416, K-10430, & K-10433. Turn off the water supply to the faucet, in most cases there are stop valves under the sink that should accomplish this. You should verify the water is off before proceeding with the cartridge replacement by turning the faucet on to both hot and cold to check. Remove the plastic plug button from the rear of the handle and loosen the allen set screw allowing the handle to pull off. Remove the bonnet cover then using an adjustable wrench remove the bonnet nut. Once the bonnet nut is removed you are then able to grip the cartridge and pull it up out of the valve body. You will need a Kohler # GP1016516 replacement cartridge and the new one should be lubricated with some plumbers grease and put back into position with a assembly in the reverse. If there is a problem with the diverter you will need to get deeper into disassembly with the diverter located under the spout. All Kohler single handle side spray faucets use the Kohler # 75878 diverter but you should check the diagram for your faucet as additional parts such as O-Rings will probably be needed when you remove the spout. The K-10433 pull out style faucet does not have a diverter under the spout but does have other components such as a check valve, and screen where the hose connects to the pull out head which should be checked when there are flow problems. Once reassembled turn the water back on and check for proper operation and leaks.

Kohler Forte 2-Handle Wide Spread Kitchen Sink Faucet

The Kohler Forte 2-Handle Wide Spread Kitchen Sink Faucet # K-10445 cartridge replacement is accomplished turning off the water supply usually with valves under the sink, then you need to unscrew the bonnet at the base of the handle. This will unscrew and the handle assembly will come off with it. Sometimes these can be difficult to remove especially if they have been wet and have gotten corroded, a strap wrench may help in unscrewing the bonnet. On the K-10445 faucet 2 different cartridges are used and you will only be able to tell which you have after the bonnet is removed. One has a cartridge made of metal in which case a Kohler #GP77005 (hot) & GP77006 (hot) are used, and the other cartridge is made of plastic in which case a Kohler #GP1092204 (hot) & GP1092203 (cold) are used. After the bonnet has been removed us an adjustable wrench to unscrew the hot and cold cartridges or, valves and grease the new ones with plumbers grease and reassemble. Make sure that the right cartridges are on the right side or the faucet handles will work backwards. Also apply plenty of grease to the bonnet before screwing it back in place to make removal later should another cartridge need changing easier. This faucet also uses the Kohler # 75878 diverter but you should check the diagram for the faucet, as additional parts such as O-Rings will probably be needed when you remove the spout and replace the diverter. Turn the water supply back on test for function and leaks.

Kohler Forte Single Handle Lavatory Faucets

The Kohler Forte Single Handle Lavatory Faucets K-10215-4 & K10217-4 disassemble and reassemble the same as the Kohler Forte single handle kitchen faucets except they use a Kohler # GP1017426 cartridge, and they do not have a diverter or movable spout.

Kohler Forte Wide Spread Two Handle Lavatory Faucets

The Kohler Forte Wide Spread Two Handle Lavatory Faucets K-10272-4 &10272-4A disassemble and reassemble the same as the Kohler Forte two handle wide spread kitchen faucets and use the same two different cartridges Kohler #GP77005 (hot) & GP77006 (hot) or, Kohler #GP1092204 (hot) & GP1092203 (cold). However lavatory faucets do not have a diverter or movable spout.

Kohler Forte Two Handle Centerset Lavatory Faucet

The Kohler Forte Two Handle Centerset Lavatory Faucets K-10270-4 & K10270-4A can be repaired by shutting off the water supply valves usually found under the sink, then they have a ring below the handle, which unscrews for the handle to be removed. Once the handle is removed an adjustable wrench can be used to remove the hot and cold cartridges from the valve body. Only Kohler # GP77005 (hot) & GP77006 (cold) cartridges are used. As always grease the cartridge with plumbers grease and the retaining ring for the handle to assure easy disassembly in the future.

As you can see with a few basic tools and a few parts, in many cases you can easily fix a Kohler Forte Faucet.

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90 comments on “Kohler Forte Faucet Troubleshooting & Repair Guide
  1. John Aguilar says:

    Outfitted my sinks with the 4″ K-10270-4-G Forte faucets.
    One became tough to on/off…both cold & hot.
    The cold (right)handle snapped where it spins.
    Took the faucet out to discover the white plastic (female serrated) handle sheared.
    Called Kohler parts and explained that the cartridge was frozen (both). Good fortune for me; Kohler is sending new cartridge…..but the handle spins free.
    The folks who speak to you have only the cartridge to send…not the handle component. have you seen a complete schematic on all parts for this faucet?

    • Redwood says:

      Hi John,
      You should just “Google” the model number K-10270-4 and go to the Kohler Web Page for the faucet which should have a link to the parts list. I believe you are looking for the #1239467 Extension Stem, or the #GP1074231 Spline Adapter.
      Hope this helps,

  2. Mickey says:

    I have a k-10433. The handle is loose (too much play) but the screw is tight. Any suggestions?

  3. Nase says:

    My Kohler kitchen faucet K-690 is leaking out of the handle. I replaced the valve cartridge and it is still leaking. Do you think it could be the check valve? How do you replace the check valve? Any suggestions.

    • Redwood says:

      Hi Nase,
      If it is leaking out of the handle I suspect either a defective cartridge, a missing seal, a seal from the original cartridge left behind, misalignment when installed or, not tightened enough.

  4. frank says:

    I’m having trouble getting the diverter out of the faucet I’ve put some CLR in the body. Should i be able to pull the diverter out with some needle nose pliers

  5. coleman says:

    I have the same problem of a k10433 with stiff barrel. Kohler sent me a bearing and an O ring. I got the bonnet and the nut off but cannot remove the barrel. (hub) I have already caused problems by over tightening the shut off valve, which now no longer works, and has clogged up the hot water. I have tried vinegar, how do I proceed to get this hub off without further damaging

  6. Dennis Dougherty says:

    I have a Kohler Forte Kitchen faucet with a single control with an integral extending outlet/spray detail.

    My unit is leaking under the sink where the black braded hose from the extending spray unit connects to the stainless steel braded hose. It appears that the o-ring on the black braded hose is no longer sealing sufficiently.

    How do I find an O-ring replacement ?

    • Redwood says:

      Hi Dennis,
      You’ll need to find your faucet model number and look at the parts list at Kohler’s website to find the part number of the right hose for your faucet.

  7. Emily Reddix says:

    I have the Kohler Forte K12177 faucet that has sprung a leak in the hose about half the length of the hose. Question- What is a temporary fix until the company opens on Monday? Can the hose be repaired?

  8. Paul says:

    I have a Kohler Forte, model #k-10415-cp, and I need to replace the inlet hoses. Please advise me how to do so. Thank you

  9. Greg says:

    I have new Forte 10270 bathroom faucets. When you turn on the water instead of a fairly uniform water direction, they seem to have multiple streams coming out at an odd angle. Almost like there is something wrong with the aerator at the end of the faucet. all 3 have the same issue to varying degrees. Any thoughts on how to resolve this?

    • Redwood says:

      Hi Greg,
      Unscrew the aerators of the end of the faucets and clean them. Or order part # 1103463 in the appropriate finish and replace them.

  10. Scott says:

    I have a Kohler 10217-4 have have followed the instructions for the kitchen single handle faucet above. However once the set screw is removed the handle does not lift off. Is there a trick?

    • Redwood says:

      Hi Scott,
      Nope! Brute Force and Anger reign supreme. You are only going to break part of the cartridge that you are going in there to replace anyway.

  11. Rick says:

    I have a Forte R10412-CP kitchen faucet with low pressure in the sprayer. I replaced the diverter valve,#75878, didn’t help. Replaced the cartridge, #1016515, didn’t help either, replaced the sprayer, #1021724, no help. Can’t see any obstructions in the lines, any suggestions ??

  12. Dave says:

    Kohler Forte model k 10412. No water coming out of side spray. Changed diverter, no change. What next?

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