Seeing that “Check Water” error light flashing on your dishwasher is frustrating, especially when you’ve got a sink full of dirty dishes. This error appears when your dishwasher detects an issue with water supply or water level, and it won’t start or complete a cycle until the problem is resolved.
The good news is that most check water errors are fixable without calling a professional. In my experience helping homeowners troubleshoot their appliances, I’ve found that 80% of these issues stem from three simple causes: a closed water supply valve, a kinked supply hose, or a clogged filter. This guide will walk you through every step to diagnose and fix the problem yourself.
We’ll cover everything from basic checks to more advanced troubleshooting, including brand-specific error codes like the Bosch E15. By the end of this article, you’ll know exactly what’s causing your dishwasher check water error and how to fix it.
Safety First: Before You Start Troubleshooting
Before diving into any dishwasher repair, I always recommend taking a few safety precautions. These simple steps protect both you and your appliance from damage.
First, turn off the dishwasher at the wall socket. This prevents any accidental electrical issues while you’re working with water components. If your dishwasher is hardwired, flip the circuit breaker that supplies power to the unit.
Next, locate and shut off the water supply valve. You’ll typically find this under the kitchen sink or behind the dishwasher itself. Turn the valve clockwise until it stops to prevent any water from flowing while you’re working.
Have several towels or a shallow tray ready. Dishwashers hold water even when not running, and you may encounter some spillage when removing filters or accessing components. I learned this the hard way after accidentally flooding my kitchen floor during my first dishwasher repair attempt.
Tools you might need include a flashlight, a multimeter (for electrical testing), a small brush or old toothbrush for cleaning, and possibly a wrench if you need to disconnect water lines. Most basic troubleshooting won’t require specialized tools, but having these on hand will make the process smoother.
Dishwasher Check Water: Step-by-Step Troubleshooting
This step-by-step guide will help you systematically check each component that could be causing your check water error. I recommend following these steps in order, starting with the simplest and most common causes before moving to more complex issues.
Step 1: Check the Water Supply Valve
The water supply valve is the most common culprit behind check water errors. I can’t tell you how many times I’ve arrived at someone’s home to “fix” their dishwasher, only to find that someone had accidentally bumped the valve closed while cleaning under the sink.
Locate your water supply valve first. It’s typically an oval-shaped handle located under the kitchen sink, connected to the copper or flexible water line leading to your dishwasher. In some installations, you might find it in the cabinet next to the dishwasher or even in the basement directly below the unit.
Check the valve position. If the handle is perpendicular to the pipe, the water is off. Turn it clockwise until it stops, then try turning it counterclockwise. You should feel resistance as the valve opens fully. The handle should be parallel to the pipe when fully open.
Test if water is flowing by carefully loosening the supply line connection at the dishwasher inlet (have towels ready). If water flows freely, your supply is working. If no water comes out even with the valve open, the issue might be with your home’s plumbing or the valve itself may be faulty.
Some homes have shut-off valves in unusual locations. I once found a dishwasher supply valve hidden in the ceiling of a basement laundry room. If you can’t locate the valve under the sink, trace the water line back from the dishwasher to find where it connects to your home’s plumbing system.
Step 2: Inspect the Water Supply Hose
If your water supply valve is open but water still isn’t reaching your dishwasher, the supply hose might be the problem. These hoses can become kinked, crushed, or blocked over time, especially in tight installations where the dishwasher is pushed back against the wall or cabinetry.
You’ll need to pull the dishwasher out to inspect the full length of the supply hose. This can be tricky since dishwashers are often secured to the countertop. Look for mounting screws inside the door frame or at the top corners of the unit. Remove these, then carefully slide the dishwasher forward.
Examine the entire length of the supply hose for kinks or sharp bends. Even a partial kink can restrict water flow enough to trigger the check water error. The hose should have gentle curves, not sharp angles. If you find a kink, gently straighten it out. You may need to adjust how the hose is routed or secure it with clips to prevent future kinking.
Check for crushing or damage. Supply hoses can become compressed against the wall or cabinet, especially if the dishwasher was installed too tightly. Look for any signs of wear, cracking, or deterioration. Braided stainless steel hoses are more durable than rubber ones and resist crushing better.
Consider replacing the hose if it’s damaged or more than 5-10 years old. Rubber hoses can degrade and even burst over time, potentially causing significant water damage. Upgrading to a braided stainless steel supply line is a relatively inexpensive fix that provides peace of mind.
Step 3: Check the Water Inlet Valve
The water inlet valve is the electrical component that controls water flow into your dishwasher. When your dishwasher calls for water, this valve opens to allow water in, then closes when the proper water level is reached. A faulty inlet valve is a very common cause of check water errors.
The inlet valve is typically located behind the lower kick plate at the bottom front of the dishwasher. You’ll need to remove the kick plate (usually held by two screws) to access it. Follow the water supply line from the back of the dishwasher—it connects directly to the inlet valve.
First, check the inlet filter screen. Many inlet valves have a small screen or filter where the water line connects. Over time, this can become clogged with sediment, rust, or debris from your pipes. Carefully unscrew the water line connection and inspect the screen. Clean it gently with a small brush or replace it if damaged.
Test the valve with a multimeter if you’re comfortable working with electricity. Set your multimeter to measure resistance (ohms) and test the valve’s solenoid coil. A working inlet valve typically shows resistance between 500-1500 ohms. If you get no reading or a reading outside this range, the valve is likely faulty and needs replacement.
Listen for the valve during operation. With the dishwasher door open but the cycle started, you should hear a distinct humming sound when the valve opens to let water in. If you hear humming but no water enters, the valve might be receiving power but not opening—another sign it needs replacement.
Step 4: Inspect Float Switch and Overfill Protection
The float switch is your dishwasher’s safety mechanism that prevents overfilling. It’s a small floating device (usually looking like a small cup or mushroom cap) in the bottom of the dishwasher tub. As water rises, the float rises with it, triggering the switch to stop water flow when the proper level is reached.
Locate the float in the bottom of your dishwasher tub. It’s usually in one of the front corners, though some models have it in the center. Look for a small plastic cap that can move up and down freely.
Test the float movement. Gently lift the float and release it—it should move smoothly up and down without sticking. If the float is stuck in the raised position, your dishwasher “thinks” it’s already full and won’t allow more water in, triggering the check water error.
Clean around the float assembly. Debris, food particles, and mineral buildup can cause the float to stick. Use a small brush or old toothbrush to clean thoroughly around the float and its housing. For stubborn mineral deposits, a mixture of vinegar and water can help dissolve the buildup.
Check the float switch itself (the electrical component under the tub that the float activates). If you’re comfortable with electrical testing, use a multimeter to check for continuity. The switch should show continuity when the float is raised and no continuity when lowered. If it doesn’t change, the switch needs replacement.
Step 5: Check Drain Pump and Filter
While it might seem counterintuitive, drainage issues can sometimes trigger check water errors. If your dishwasher can’t drain properly, it may detect water where it shouldn’t be (like in the base pan), which activates safety systems and displays the check water warning.
Locate and clean the dishwasher filter. Most modern dishwashers have a cylindrical filter assembly in the bottom of the tub. Twist or unclip it to remove. You’ll likely find food particles, debris, and possibly even broken glass or utensil pieces trapped there. Clean thoroughly under running water.
Inspect the drain pump impeller. With the filter removed, you should be able to see the drain pump cover or impeller. Check for any debris wrapped around the impeller that might prevent it from spinning freely. Use needle-nose pliers or tweezers to carefully remove any obstructions.
Check the drain hose where it connects to the sink drain or garbage disposal. This connection can become clogged with food waste or mineral buildup. If accessible, disconnect and clean the hose end. For garbage disposal connections, check that the knockout plug was removed when the dishwasher was installed (a surprisingly common oversight).
Test the drain pump by listening during the drain cycle. You should hear the pump running. If it’s making unusual noises or not running at all, the pump may be faulty. Some dishwashers also have a check valve in the drain line that can become stuck closed, preventing proper drainage.
Brand-Specific Error Codes
Different dishwasher manufacturers use various error codes to indicate water supply issues. Understanding these codes can help you pinpoint the exact problem faster.
Bosch dishwashers are famous for their E15 error code, which specifically indicates water in the base pan or floor of the dishwasher. This activates the AquaStop leak protection system. Unlike other check water errors, E15 usually requires tipping the dishwasher backward slightly to drain water from the base pan, then allowing it to dry completely before restarting.
Siemens dishwashers use similar error codes to Bosch since they’re manufactured by the same company. Look for E:15 or E:16 errors, which indicate water supply or drainage issues respectively.
Whirlpool, Maytag, and KitchenAid dishwashers often display F1, F2, or F3 codes for water supply issues, while Samsung models show 4E, 5E, or LC errors depending on whether the issue is with water supply or drainage.
If you’re unsure what your specific error code means, check your owner’s manual or search online for your model number plus the error code. Manufacturers often provide troubleshooting guides specific to each error code on their websites.
How to Reset Your Dishwasher After Fixing the Issue
Once you’ve identified and fixed the underlying problem, you’ll need to reset your dishwasher to clear the error code and restore normal operation. Reset procedures vary by brand and model.
For most dishwashers, a simple power cycle works: turn off the dishwasher at the wall socket or flip the circuit breaker, wait 2-3 minutes, then restore power. This allows the electronic control to reset and clear stored error codes.
Bosch Serie 2 dishwashers have a specific reset procedure: press and hold the Start button for at least 3 seconds while the dishwasher is powered on. This should clear most error codes, including check water warnings.
After resetting, run a test cycle. I recommend starting with a quick wash or rinse cycle to verify everything is working properly before loading a full load of dishes. Listen for proper filling, washing, and draining, and watch for any error codes reappearing.
If the error returns after reset, you haven’t fully resolved the underlying issue. Go back through the troubleshooting steps, focusing on components you may have missed or not thoroughly checked.
When to Call a Professional
While most check water errors are DIY-fixable, some situations require professional service. Recognizing when you’re in over your head can save time, money, and prevent further damage to your appliance.
Call a professional if you’ve completed all the troubleshooting steps and the error persists. This suggests a deeper issue like a faulty electronic control board, a major internal leak, or a problem with the dishwasher’s main wiring harness.
Complex repairs like replacing the electronic control board, circulation pump, or internal water lines are best left to professionals. These repairs often require specialized tools and knowledge, and improper installation can lead to further problems or even safety hazards.
Consider your dishwasher’s age and value when deciding between repair and replacement. If your dishwasher is over 8-10 years old and needs a major repair costing more than half the price of a new unit, replacement might be more economical. Newer models are also more energy-efficient, which can save money over time.
Don’t ignore your dishwasher warranty. If your unit is still under warranty, DIY repairs can void the coverage. Check your warranty terms before attempting any repairs beyond basic maintenance and filter cleaning.
Prevention Tips to Avoid Future Check Water Errors
Preventing check water errors before they happen saves time and frustration. These simple maintenance habits can keep your dishwasher running smoothly for years.
Clean your dishwasher filter monthly. Food particles and debris build up quickly, and a clean filter ensures proper water flow and drainage. This 5-minute task prevents many common dishwasher problems.
Inspect your water supply line annually. Check for kinks, wear, or deterioration. Consider upgrading to a braided stainless steel supply line if you still have an old rubber one—these are more durable and burst-resistant.
Use the right amount of detergent. Too much detergent can create excessive suds that confuse sensors and trigger errors. Follow manufacturer recommendations and adjust based on your water hardness. If you have soft water, you may need less detergent than the package suggests.
Don’t overload your dishwasher. Overloading prevents proper water circulation and can strain components. Leave space between items for water and detergent to reach all surfaces. Your dishes will actually come out cleaner when the dishwasher isn’t packed to capacity.
Run hot water at the sink before starting the dishwasher. This ensures hot water enters the dishwasher immediately, rather than wasting time filling with cool water first. This is especially important in winter when pipes are colder.
Frequently Asked Questions
What do you do when your dishwasher says check water?
First check that the water supply valve under your sink is fully open. Then inspect the supply hose for kinks or blockages. Clean the inlet filter screen and check that the float switch moves freely. If these don’t resolve the issue, you may need to test or replace the water inlet valve.
How do I check if my dishwasher is getting water?
Start a cycle and listen for the water inlet valve humming when water should be entering. Open the door mid-cycle and check if water has covered the bottom of the tub. If no water is present after 2-3 minutes, your dishwasher isn’t getting water supply and you should check the valve, hose, and inlet valve.
Why does my Bosch dishwasher say check water and not draining?
Bosch check water errors combined with drainage issues typically indicate the E15 error code, meaning water has leaked into the base pan. This activates AquaStop protection. You’ll need to remove the bottom panel, tip the dishwasher backward slightly to drain the base pan, then let it dry completely before resetting.
How to reset Bosch dishwasher check water?
For most Bosch models, press and hold the Start button for 3-5 seconds while the dishwasher is powered on. For persistent E15 errors, you may need to disconnect power for 5 minutes, drain the base pan by tipping the unit slightly backward, then restore power and retry the reset procedure.
Can I use my dishwasher if the check water light is flashing?
No, you should not run your dishwasher when the check water light is flashing. This error indicates a problem that needs to be resolved first. Running the dishwasher could cause further damage or incomplete cleaning. Fix the underlying issue before using the appliance again.
What causes the check water error to appear repeatedly?
Recurring check water errors usually indicate an unresolved underlying issue. Common causes include a partially faulty water inlet valve that works intermittently, a float switch that sticks periodically, low water pressure in your home, or an electronic control board that’s failing. Professional diagnosis may be needed for recurring issues.
Conclusion
The dishwasher check water error is one of the most common appliance issues homeowners face, but it’s also one of the most fixable. By systematically working through the troubleshooting steps in this guide, you can identify and resolve most problems without expensive professional service calls.
Remember that 80% of check water errors stem from three simple causes: a closed water supply valve, a kinked supply hose, or a clogged filter. Start with these basics before moving to more complex components like the inlet valve or float switch.
If you’ve completed all troubleshooting steps and the error persists, or if you’re uncomfortable with any of the procedures, don’t hesitate to call a professional. Sometimes the cost of professional service is worth avoiding the risk of further damage or the frustration of unresolved issues.
Once your dishwasher is running again, commit to regular maintenance to prevent future check water errors. Monthly filter cleaning, annual hose inspections, and proper loading habits will keep your dishwasher running efficiently for years to come.
Leave a Comment