4 Reasons Delta Flush IQ Is Not Working – Fixed!

Just like humans, machines aren’t perfect, and even the most advanced technologies fail every once in a while. The Delta FlushIQ is an automatic flush actuator developed by the Delta Faucet Company. While it does make using the toilet more convenient, it cannot function flawlessly all the time, so what causes it to fail?

The Delta Flush IQ may not work if the sensor doesn’t actuate the flush. This can be due to many reasons, including the sensor running out of battery, water in the sensor, or leak protection being activated.

Delta Flush IQ
Source: https://youtu.be/gM3OEIEmKlE

This article will discuss all the reasons your Delta Flush IQ isn’t working, giving you some tips on repairing it. 

Why Is My Delta Flush IQ Toilet Not Working?

The sensor of your Delta Flush IQ alerts you about specific issues by glowing or flashing different colored lights for various problems. You can find out what each of these colors means by reading the guide provided on the underside of the lid of your flush tank.

Since the Delta Flush IQ uses an electronic sensor device, there can be many reasons why it may stop working. Here are the primary reasons this might happen:

1. The Batteries Have Run Out

If you notice a red light flashing on your sensor when you flush it, it means that your Delta Flush IQ is running low on battery. If your sensor runs out of battery, it will stop working automatically.

 low on battery

To fix this issue, follow the instructions below:

  1. You need to remove the lid of your flush tank, disconnect the water supply and detach the sensor from the valve cover. 
  2. After this, you will have to drain as much of the water out of the tank as you can. Then, replace the 4 AA batteries (or alternatively, 4 C batteries) in the sensor with fresh ones. 
  3. Reinstall all the parts of the Delta Flush IQ and try to flush your toilet again.

2. The Toilet Is About To Overflow

If your toilet bowl gets overfilled, it may activate overflow protection. In this case, the sensor will flash blue and red lights alternately. This happens when the drainage path is clogged, and the water level in the toilet bowl exceeds normal levels.

In this instance, follow the instructions below to fix the issue:

  1. Ensure your toilet’s drainage pipe isn’t plugged. 
  2. Remove any debris that may be blocking the path of the water flow. 
  3. Wait for the water level in your toilet bowl to drop to an average level, and try flushing again.

You can learn more about what you should do if your toilet is about to overflow in this article: What to Do When Toilet Overflows?

3. Leak Protection Is Activated

A screw-like appendage protrudes from beneath the body of your Delta Flush IQ sensor. The purpose of this sensor screw is to keep an eye on the water level in your flush tank. Under normal conditions, the screw should be somewhat submerged in the water in your flush tank.

If there’s a leak in your flush and the water level in your flush tank drops below normal without anything simulating the flush, the tank will stop refilling on its own to prevent further leaks. In this case, the sensor light will either be:

  • Solid yellow: If the water level is still high enough for the flush to function. 
  • Flashing yellow: If there is a tank refill failure.

When there is a tank refill failure, the water level in your tank may drop below the height of the flapper. With an empty tank and a fresh water supply to the flush tank, the Delta Flush IQ stops flushing altogether.

To deal with this issue, remove the sensor and the actuator and check for the cause of the leak. It could be caused by a problem with the way the valve lid fits or a crack in the flush tank itself. If the leak is too hard to detect, you can read my article titled “Toilet Tank Losing Water But No Leak? Fixed!

Here’s how to get your Delta Flush back up and running again:

  1. Empty the tank completely. 
  2. Fix the cause of the leak. 
  3. Refill your flush tank manually. 
  4. Let it sit for a while before testing. 

If the leak is fixed correctly and there is no yellow light, your tank should refill and function normally.

4. Water Getting Into the Sensor

Sometimes, the water level in your flush tank may be too high. This can cause water to enter the sensor via direct contact or condensation from extreme humidity. This water may get into the electronic parts of the sensor and cause damage.

Delta Flush toilet

To check for water damage, you’ll need to disconnect your sensor and remove the batteries. If you can see water droplets inside the body of your sensor, there is a high chance that your sensor is damaged and not working. In such a case, you need to contact Delta and order replacement parts for your Delta Flush IQ toilet.

Once you get the replacement parts, disassemble your sensor and install the new one. To prevent further water damage, ensure that the water level inside your flush tank is never too high. You can use little foam pads under the tank lid to prevent condensation.

How Does Delta Flush IQ Work?

Your Delta Flush IQ comes with a sensor built into its body in place of a traditional flushing flapper. When you place your hand at a distance of ½ inch (1.27 cm) from the sensor for 1-2 seconds, the sensor actuates the flush. It does so by lifting the lid of the flush valve and releasing water into the toilet bowl.

The Delta Flush IQ flushing mechanisms work with a flapper-style flushing system. A flapper flushing system is the simplest of gravity-flushing systems. The flush valve is covered by a lid in a flapper flush system. This lid is connected to the Delta Flush IQ actuator by a thick wire/pipe, fastened with the help of a nut and bolt. The actuator pulls the lid open when the flush is actuated, and the water flows through the valve. 

 The Delta Flush IQ is available in two different styles: elongated and round.