Kohler K-R77748 Sensor Not Working? – Troubleshooting

After my touchless faucet stopped doing what it did best, I started doing some research on it. And my research got even more intense after finding the model number.

That’s when I realized something was wrong with the sensor, and I immediately looked into why is my Kohler K-R77748 sensor not working.

From what I have figured, there can be various reasons behind it – including dead batteries and excessive debris on the sensor. Now, unless you find the issue, you cannot find the solution. Because after finding the root of the problem, the solution comes easy.

Hence, we will be discussing both the problems and the solutions right here in this article.

Insights on K-R77748 SD

If you have been using the Malleco faucet, then you will know how magical it truly is. With a simple wave of your hand, you can turn the water stream on and off – making your work more effortless.

The K-R77748 SD is not short of a revolutionary touchless faucet by Kohler, which brings both quality and innovativeness to the table.

Firstly, this is a kitchen sink faucet with a pull-down design.

But what truly makes it stand out in the faucet world is its soap/lotion dispenser. This game-changing feature provides convenience to all of its users alike.

Not to mention, the touchless facility provides a number of other benefits as well.

For instance, you will not have to touch the faucet or use the handle to start the stream of water. This aspect reduces the spread of germs and bacteria across a household.

Moreover, this will conserve water as well.

But just like in any other touchless faucet, the K-R77748 sensor also faces some issues from time to time. In fact, it case stop working as well due to many causes.

And here, we will focus just on the sensor rather than the whole Kohler touchless faucet troubleshooting.

Why Is Kohler K-R77748-SD Not Working?

Don’t panic if your Kohler K-R77748 sensor stops working – there can be various reasons behind it with easy fixes.

Well, here, we will be discussing those reasons, which will help you figure out the main cause.

1. Debris on the Sensor

If your Kohler K-R77748 sensor has suddenly stopped working, then excessive debris on it might be one of the causes. The motion detector of the sensor stops working if there is something already on it.

2. Steam Detected by the Sensor

What else can the sensor not stand at all? – Steam. Yes, if the K-R77748 sensor detects steam, then it can stop working immediately.

Now, a kitchen sink is sure to have steam around it at some point, so that can be a prominent reason.

3. Batteries Have Powered Down

Have the batteries of your Malleco faucet died? You can easily find out whether it has or not by checking the batteries.

Naturally, these sensors stop working if there is something wrong with the battery itself.

4 Connected to Wrong Outlet

Your K-R77748 sensor needs adequate power to function. Hence, you will have to connect it to the outlet that can provide that power or use an AC adapter.

Either way, if the power is not sufficient enough, then the sensor will not work.

5. Manual Sensor Override Mode

In some cases, your touchless faucet might be in manual sensor override mode, and you may not realize it. So, you have to check all the settings to make sure it isn’t.

6. Wrong Handle Position

The positioning of the handle might impact the functionality of the sensor as well.

For instance, if the handle is perpendicular or in the open position, then the sensor will not work. You need to make sure first that the handle is parallel.

Kohler K-R77748 Troubleshooting – What to Do When the Sensor Does Not Work?

It is only normal to be clueless when your touchless faucet sensor stops working.

But with the troubleshooting tips provided here, you will be able to fix the problem without taking much time or putting in much effort.

1. Determine the Issue

Right when your sensor stops working, you need to determine the issue. Start by checking the power source – either the batteries or the AC adapter.

Then check if there is any form of debris on the sensor or not. Finally, check the settings of the faucet to see if everything else is fine.

2. Clean the Debris

After checking the K-R77748 sensor, if you detect debris on it, then it is time to clean it off. Use a cloth with warm and soapy water to clean the sensor lens.

Towel dry the lens once you are done – or wait for it to air dry.

3. Tighten the Connection

Once you have checked the cables and wires under the faucet itself, you need to tighten them if they are loose.

This aspect can significantly hinder the functionality of the sensor – hence, always check the wires.

4. Replace the Batteries

Most people tend to check the battery compartment once the sensor of their touchless faucet stops working. And if you see that yours are dead, then you need to replace them.

Or, you can use the faucet manually as well.

5. Disengage Manual Override

Once you replace the batteries, you might often forget to turn off the manual override function.

That might also hinder the K-R77748 sensor from working, so you should change that feature.

6. Replace the K-R77748 Sensor

If you see that there is no specific issue that is stopping your sensor from functioning, then the faucet’s sensor is the problem itself.

In that case, you will need to replace the sensor.

ll Kohler K-R77748-SD Parts

The more you know your faucet, the better. Hence, we will discuss the other parts of Kohler K-R77748 here – so you can get a little more insight on them.

Pull Down Sprayer

This part of the K-R77748 makes sure to reach beyond the sink to get work done.

You will be able to use this sprayer using one hand only – not just doing your work fast, but also efficiently.

Handle

With this touchless faucet, you will be getting 1 handle. You can use it to turn the faucet on and off manually if you don’t want to power it up.

Soap Dispenser

To make things even more convenient for you, the K-R77748 comes with a soap dispenser. You can use it to dispense lotion as well – whatever you need to help with your kitchen work.

LED Light

Another amazing part of this faucet is the LED light included. This light will indicate when the faucet is ready to use – so you will easily find out whether the sensor is working or not using its help.

Other Internal Parts

The K-R77748 contains other amazing internal parts – such as ceramic disc valves, solenoid valves, and more. They will provide the best performance while helping the faucet function exactly how you want it to.

Final Words

Did you find the cause and solution to your Kohler K-R77748 sensor not working?

Unless you fully inspect the faucet, you will not be able to find out the issue – so start with that.

If you are not sure about it all by yourself, then you can hire a plumber for it.