You can enjoy a warm shower during those freezing days and a cold one to cool down during the summer heat because of shower mixing valves which come in different brands, including Kohler. These devices can develop issues that you must address promptly hence the need for this Kohler shower mixing valve problems & fixes guide.
The issues that can occur in a Kohler shower valve include having too cold or too hot water temperature, too high or too low water pressure, and weak water flow. Other problems are dripping or leaking and non-stop running shower.
This post provides a comprehensive guide to Kohler Highline toilet problems and how to fix them.
Kohler Shower Mixing Valve (Causes & Fixes)
| Problem | Possible Causes | Recommended Fixes | |
| 1. | Too Cold or Too Hot Water | Incorrect temperature settings Thermostatic cartridge issues Mineral buildup Water pressure problems Cold water supply issues | Adjust the temperature dial or level Install a new thermostatic cartridge Clean the Kohler shower mixing valve Adjust your home’s water pressure Fix the cold water supply |
| 2. | Too Low or Too High Water Pressure | Water pressure regulator problems Valve cartridge issues Blockages or debris Water supply line problems | Adjust the water pressure regulator Replace the valve cartridge Clean the shower mixing valve to remove debris Fix the water supply line problems |
| 3. | Weak Water Flow | Water pressure issues A clogged or damaged pipe Blocked valve A damaged valve cartridge A clogged showerhead | Adjust the pressure regulator to increase the water pressure Clean the valve Replace the valve cartridge Unblock the showerhead or replace it |
| 4. | Non-stop Running Shower | High water pressure A loose or damaged washer A faulty valve cartridge Worn-out Kohler shower mixing valve | Lower water pressure by adjusting the regulator Replace the washer, valve cartridge, or the entire shower mixing valve |
| 5. | Dripping or Leaking | A worn-out valve cartridge Loose valve handle Damaged O-rings Faulty valve seat | Replace the valve cartridge or O-rings Tighten the valve handle |
1. Too Cold or Too Hot Water
While the ideal water temperature for the shower is a matter of preference and your comfort level, it should not be too cold or too hot. Typically, most people are comfortable with 98.6°F to 109.4°F (37°C to 43°C).
A shower mixing valve mixes cold and hot water for the appropriate showering temperature. However, getting the proper water temperature may not be possible if your Kohler shower mixing valve malfunctions, causing the water to either be too cold or too hot.
Incorrect temperature settings, thermostatic cartridge issues, mineral buildup, water pressure problems, and cold water supply issues cause this problem.
The thermostatic cartridge regulates the temperature of the water in the valve. However, since this component wears out over time, it can cause temperature fluctuations.
Moreover, mineral buildup inside the Kohler shower mixing valve can cause temperature fluctuations. Over time, the minerals in your water can accumulate in the valve, affecting its performance.
Sometimes, water pressure issues can also affect the water temperature, making it either too high or too low. Additionally, the cold water supply can make the water flowing from your Kohler mixing shower valve consistently too hot or too cold.
Fix
- Turn the temperature dial or lever towards the cold side if the temperature is too hot and towards the hot side if too cold. Keep adjusting until you get the right temperature.
- Replace the thermostatic cartridge.
- Clean your Kohler shower mixing valve with a descaling solution to remove debris and mineral buildup.
- Adjust your home’s water pressure regulator to fix pressure issues.
- Inspect the cold water supply for problems like blockages and whether the water valve is fully open and address them.
2. Too Low or Too High Water Pressure
If you can get the sweet spot of water pressure (not too high or too low), you will have a refreshing shower. However, you won’t get that if your Kohler shower mixing valve produces water with too low or too high pressure.
Kohler shower mixing valve water pressure issues happen due to water pressure regulator problems, valve cartridge issues, blockages or debris, and water supply problems.
If the water pressure regulator fails or is incorrectly adjusted, the water pressure can become too high or too low. Additionally, since the valve cartridge regulates the water flow through the shower valve, pressure issues can develop when it wears out or gets damaged.
Furthermore, blockages or debris inside the valve will reduce the water flowing through and out of your shower. A blocked or leaking supply line will also affect the water pressure in your shower valve.
Fix
- Adjust the water pressure regulator.
- Install a new valve cartridge.
- Use a descaling solution to clean the valve.
- Unblock the water supply line or repair the leaking parts.
3. Weak Water Flow
The first place to do if your Kohler shower mixing valve has a weak water flow is to ensure the shut-off valves are fully open. If the valves are fully open but the problem persists, you may have water pressure issues, a clogged or damaged pipe, a valve blockage, a damaged valve cartridge, or a clogged showerhead.
A major cause of weak water flow is low pressure. In that case, if you find out that your home’s water pressure is low, your shower will likely have a weak flow.
Also, blockages or debris in your Kohler shower mixing valve can reduce water flow, and so can a worn or damaged valve cartridge. In addition, you should check the showerhead to see if its holes are clogged by debris or mineral buildup.
Lastly, inspect the plumbing pipes for damage or obstructions since they can restrict water flow.
Fix
- If the low water pressure stems from a poorly adjusted pressure regulator, adjust it. If not, check with a plumber to identify the causes and fixes.
- Clean the valve.
- Replace the valve cartridge.
- Soak the showerhead in vinegar solution, scrub it using a soft-bristled brush, then rinse it with water. Alternatively, install a new showerhead. The SparkPod Shower Head (View on Amazon) is a round, universal, easy-to-install showerhead in multiple colors that delivers high-pressure rainfall.
4. Non-Stop Running
If you turn off your Kohler shower mixing valve but find the water still running, then you have a problem that you should address promptly. This is because continuously running water cause water wastage, water damage, and increased water bills.
Continuous running in your shower can happen for various reasons, including a faulty valve cartridge, a loose or damaged washer, and high water pressure. Moreover, the Kohler shower mixing valve may be worn out or damaged.
A worn-out or damaged valve cartridge can make your shower run continuously by failing to shut off the water flow completely. The washer is another component that can cause a shower mixer to run constantly.
Over time, the washer can become loose or damaged, preventing it from creating a tight seal when the faucet is turned off.
Furthermore, your shower can run continuously if your home has high water pressure. High water pressure can create too much force for the valve to shut off the water flow completely.
Fix
- Install a new Kohler shower mixing valve cartridge.
- Replace the washer.
- Install a pressure regulator or consult with a plumber about water pressure adjustment.
- Install a replacement Kohler shower mixing valve.
5. Dripping or Leaking
Your Kohler shower mixing valve will leak or drip due to a worn-out valve cartridge, loose valve handle, damaged O-rings, or faulty valve seat. Over time, sediments accumulate on the cartridge or can corrode, leading to leaks.
If the shower handle’s set screw loosens, it will make the valve leak. In addition, the shower handle can break, causing water to run if you over-tighten it.
O-rings prevent water from leaking around the valve stem, but if they become damaged or worn out, they will fail to provide the seal, causing water leaks. Also, check the valve seat for corrosion and damage.
Fix
Fix a leaking Kohler shower mixing valve by tightening the valve handle or replacing the valve cartridge or O-rings.
If these solutions fail, consult an expert plumber or contact Kohler customer support. They can diagnose the problem and then recommend the appropriate solution.
Kohler Shower Mixing Valve Hot And Cold Reversed (How to Fix It)
If your Kohler shower mixing valve’s hot and cold water sides are reversed, adjust the valve’s cartridge to rectify the problem. Here are the steps to take:
- Temporarily stop the water flow to your shower.
- Remove the shower handle and valve’s faceplate to access the cartridge.
- Remove the cartridge from the valve body by pulling it straight out.
- Rotate the cartridge 180 degrees to switch the hot and cold ports.
- Reinsert the cartridge into the valve body, ensuring it is seated properly, then reattach the handle and faceplate.
- Turn the water supply back on and test the shower to ensure the hot and cold water are now correctly oriented.
How To Install A Kohler Shower Mixing Valve
Follow these steps to install a replacement Kohler shower mixing valve.
- Cut off water flow temporarily from the main water supply valve or the bathroom’s shut-off valve.
- Loosen and remove the shower handle, followed by the trim plate.
- Take out the cartridge.
- Remove the old Kohler shower mixing valve (you may need to cut into the wall to access the plumbing).
- Install the mounting bracket for the new valve.
- Connect the water supply lines to the valve using appropriate fittings and connectors, ensuring all connections are secure and tight.
- Install the valve cartridge and handle, then test it to ensure it operates smoothly and correctly.
- Turn the water supply back, then examine the valve for leaks. If everything looks good, replace any fixtures or covers you removed during installation.
- Lastly, run your shower to test the water temperature and flow.
Final Remarks on Kohler Shower Mixing Valve Problems
A Kohler shower mixing valve can last many years with proper installation, maintenance, and repairs. Ensure its longevity by following the manufacturer’s installation and maintenance guidelines and fixing any problems promptly.
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