Bosch Dishwasher Error Codes Explained: Troubleshooting Tips and When to Call a Pro
A Bosch dishwasher error code can feel like bad news, especially when the machine stops mid-cycle with water in the tub. The good news is that many codes point to a clear problem, such as a clogged filter, blocked drain pump, water supply issue, or leak sensor alert.
Before replacing parts or calling for service, take a few minutes to identify the code, reset the dishwasher safely, and check the most common trouble spots. Some fixes are simple. Others involve electrical parts, internal leaks, or the heating system, which are better left to a trained appliance technician.
Start with safety before troubleshooting
Before working on any dishwasher, keep the repair process safe and simple.
Turn off the dishwasher
Press the power button if the controls respond.
Disconnect power
Unplug the dishwasher if accessible. If it is hardwired, turn off the dishwasher breaker at the electrical panel.
Shut off the water supply
The valve is usually under the sink.
Let the appliance cool
If the dishwasher stopped during a heated wash or dry cycle, wait before reaching inside.
Remove standing water carefully
Use towels, a shallow cup, or a wet-dry vacuum if needed.
You can try a basic reset before deeper troubleshooting. On many Bosch models, pressing and holding the Start button for a few seconds cancels the cycle and starts a drain routine. Some models may need to be powered off for several minutes. Check the user manual for your exact model because control layouts vary.
If the same code returns right after a reset, treat it as an active fault rather than a random control glitch.
Common Bosch dishwasher error codes and what they mean
Bosch error codes can vary by model, but many follow common patterns. Use the code as a clue, not a final diagnosis.
Error code | Common meaning | Most likely cause |
`E15` | Water detected in the base pan | Leak, over-sudsing, stuck float switch |
`E24` | Drain fault | Clogged filter, blocked hose, slow drain |
`E25` | Drain pump blocked | Debris near impeller, clogged pump cover |
`E22` | Filter or sump issue | Dirty filter, food debris in sump |
`E16` | Water inlet problem | Fill valve issue, leaking inlet valve |
`E17` | Water level too high | Water pressure issue, inlet valve fault |
`E18` | Not enough water entering | Closed supply valve, kinked hose, clogged inlet screen |
`E09` | Heating fault | Failed heat pump or heating circuit |
`E19` | Internal valve or dispenser-related fault | Heat exchanger valve, water system component, dispenser circuit |
`E23` | Drain pump electrical fault | Failed pump, wiring issue, control fault |
`E27` | Low voltage | Electrical supply problem |
`E01` to `E05` | Electronic or control fault | Control board, sensor, wiring, power issue |
Now let’s look at what to do for each major code group.
Troubleshooting drain and filter error codes
Drain and filter codes are among the most common Bosch dishwasher alerts. They are also some of the best candidates for safe do-it-yourself troubleshooting.
How to troubleshoot error code E24
`E24` usually means the dishwasher cannot drain properly.
Follow these steps:
Cancel the cycle
Hold the Start button to trigger a drain if your model allows it.
Check the sink drain
If the kitchen sink is draining slowly, the dishwasher may not be able to empty. Clear the sink clog first.
Inspect the garbage disposal connection
If a disposal was recently installed, make sure the knockout plug was removed from the dishwasher drain port.
Clean the dishwasher filter
Remove the lower rack. Twist out the filter assembly from the bottom of the tub. Rinse it under warm water and scrub away grease or food buildup with a soft brush.
Check the drain hose
Look under the sink for kinks or crushed sections. The hose should not be pinched behind the dishwasher.
Run a short rinse cycle
If the code clears, watch the first few minutes and the drain portion to make sure water moves out freely.
Call a professional if the hose is clear, the sink drains well, and `E24` keeps coming back. The issue may be inside the drain pump, wiring, or control system.
How to troubleshoot error code E25
`E25` often points to a blocked drain pump or jammed pump impeller.
Try this:
Turn off power
Do not reach into the pump area while the dishwasher has power.
Remove the lower rack and filter
Take out the filter assembly at the bottom.
Access the pump cover
Many Bosch models have a small pump cover under the filter area. Remove it according to the manual.
Look for debris
Glass shards, labels, bones, twist ties, and seeds can block the impeller.
Check the impeller movement
If visible, the impeller should move freely. Use caution because broken glass may be hidden in the water.
Reinstall everything securely
A loose filter or pump cover can cause another drain issue.
If you find broken glass, wear cut-resistant gloves or stop and call a technician. If the impeller is damaged or the pump hums but does not drain, the pump may need replacement.
How to troubleshoot error code E22
`E22` usually means the filter system or sump area needs attention.
Steps to take:
Remove both filter pieces
Bosch filters often include a cylindrical fine filter and a flat mesh screen.
Wash with warm water
Use dish soap if the filter feels greasy.
Clean the sump well
Wipe the area where the filter sits. Remove food particles and buildup.
Check spray arms
Pull off or unscrew the spray arms if your model allows it. Rinse out debris from the holes.
Use the right detergent amount
Too much detergent can leave residue that collects in the filter area.
If `E22` returns even after cleaning, there may be a circulation problem, pump issue, or sensor fault.
Troubleshooting water supply and leak codes
Water-related codes can mean either too much water, too little water, or water where it should not be.
How to troubleshoot error code E15
`E15` means the dishwasher’s leak protection system has detected water in the base pan. Bosch dishwashers often use a float switch in the bottom base area to detect leaks.
Try these steps:
Stop using the dishwasher
Do not keep restarting it. More water can worsen the problem.
Turn off power and water
Safety comes first with a possible leak.
Look for visible water
Check around the toe kick, under the appliance, and inside nearby cabinets.
Check for over-sudsing
Using hand dish soap or too much detergent can create suds that overflow into the base.
Inspect the door gasket
Food, grease, or damage along the gasket can allow water to escape.
Look at loading habits
Large pans or cutting boards can redirect spray toward the door and cause leaking.
Some homeowners tilt the dishwasher slightly to drain water from the base pan. This can spill water onto floors or electrical parts, and it does not fix the cause of the leak. If `E15` returns, call a professional. The source could be a hose, pump seal, water inlet assembly, or internal sump leak.
How to troubleshoot error code E18
`E18` usually means not enough water is entering the dishwasher.
Check the basics:
Open the supply valve fully
The valve under the sink should be fully open.
Inspect the inlet hose
Make sure it is not kinked, twisted, or crushed.
Check home water pressure
If other fixtures are also weak, the dishwasher may not be the only issue.
Clean the inlet screen if accessible
Some inlet connections include a small mesh screen that can clog with sediment. Turn off water before removing any hose.
Restart a cycle
Listen for filling during the first few minutes.
If the dishwasher hums but does not fill, the inlet valve may have failed. If there is no fill sound at all, the control, wiring, or door latch may be involved.
How to troubleshoot error codes E16 and E17
`E16` and `E17` can point to water inlet problems, including overfilling or a valve that does not close correctly.
Steps to follow:
Turn off the water supply
This is especially important if water enters the tub while the dishwasher is off.
Check for water slowly filling the tub
If clean water appears between cycles, the inlet valve may be leaking.
Confirm the drain hose has a proper high loop
A poorly routed hose can cause water flow problems.
Avoid using the dishwasher
Overfilling can lead to leaks and floor damage.
These codes often need professional diagnosis because the inlet valve, flow sensor, or control board may need testing.
Troubleshooting heating, electrical, and control codes
Some codes are less suitable for DIY repair. You can still check simple causes, but do not take apart sealed electrical systems unless you are trained to do so.
How to troubleshoot error code E09
`E09` usually points to a heating problem. On many Bosch models, the heating element is part of the heat pump assembly, not a simple exposed element in the bottom of the tub.
Try this first:
Reset the dishwasher
Power it off for several minutes, then restart.
Check whether dishes are cold and wet
If cycles complete but dishes stay wet and water never heats, the heating system may not be working.
Use rinse aid
Poor drying alone does not always mean a heater failure. Rinse aid helps Bosch condensation drying work properly.
Run hot water at the sink before starting
This helps the dishwasher begin with warmer water.
If `E09` comes back, call a professional. Heat pump replacement involves electrical testing, water connections, and access below the tub.
How to troubleshoot error code E19
`E19` can involve an internal valve, dispenser circuit, or water system component depending on the model.
Basic checks:
Reset the control
Clear the cycle and power the unit off for several minutes.
Check the detergent dispenser
Make sure the door is not jammed by a tall dish or hardened detergent.
Look for water performance issues
Poor filling, odd noises, or incomplete cycles can help a technician narrow the cause.
Do not keep forcing cycles
Repeated attempts can stress related components.
This is usually a service call code. A technician can test the valve, wiring, and control output safely.
How to troubleshoot error code E23
`E23` often points to an electrical fault in the drain pump circuit.
You can:
Check for a blocked pump
Follow the safe `E25` steps to rule out debris.
Listen during drain
A hum, click, or silence can help identify whether the pump is jammed or not receiving power.
Inspect for leaks
Water in the base can affect electrical components.
Call a professional if the pump area is clear and the code remains. Electrical testing is needed.
How to troubleshoot error code E27
`E27` usually means low voltage. This may happen in homes with unstable electrical supply or overloaded circuits.
Steps to take:
Reset the dishwasher
Turn it off, then restore power after a few minutes.
Avoid extension cords
A dishwasher should use a proper dedicated connection.
Check whether other appliances are affected
Dimming lights or tripped breakers may point to a home electrical issue.
Try running the dishwasher at another time
If voltage drops during heavy appliance use, the code may appear again.
If `E27` repeats, contact an electrician or appliance technician. Do not ignore signs of electrical trouble.
How to troubleshoot error codes E01 to E05
Codes from `E01` to `E05` often relate to electronics, sensors, or control communication.
Try this:
Perform a power reset
Turn off power at the breaker for several minutes.
Check for moisture
Look for signs of leaking near the base or control area.
Confirm the door closes firmly
A latch issue can sometimes look like a control problem.
Record when the code appears
Note whether it happens at startup, filling, washing, draining, or drying.
If the code returns, schedule service. Control boards and wiring should be tested with proper tools.
When to call a professional
Some dishwasher problems are safe to inspect but not safe to repair without training. Call a qualified appliance repair technician when you notice any of the following:
The same code returns after cleaning and resetting
Water leaks from underneath the dishwasher
The breaker trips when the dishwasher runs
You smell burning plastic or electrical odors
The dishwasher fills when it is turned off
The pump hums but will not move water
There is broken glass in the pump area
A heating code such as `E09` keeps appearing
Electronic codes like `E01` to `E05` repeat
A professional can test voltage, inspect internal hoses, check pump windings, confirm control board output, and replace parts without guessing. That matters because replacing the wrong part can cost more than the original repair.
If your dishwasher is still under warranty, check the warranty terms before opening panels or replacing parts. Unauthorized repairs could affect coverage.
Practical tips to prevent future Bosch dishwasher errors
Many error codes start with buildup, blocked water flow, or poor loading habits. A few simple routines can reduce repeat problems.
Clean the filter weekly
If you use the dishwasher daily, rinse the filter at least once a week. If dishes often have heavy food soil, clean it more often.
Scrape plates before loading
You do not need to prewash everything, but large food scraps should go in the trash or compost.
Use dishwasher detergent only
Hand dish soap creates suds that can trigger leaks and `E15`.
Measure detergent carefully
Too much detergent can leave film, clog filters, and create excess foam.
Use rinse aid
Bosch dishwashers often rely on condensation drying. Rinse aid improves drying and helps water sheet off dishes.
Load dishes so spray arms can spin
Before starting a cycle, spin each spray arm by hand. If it hits a pan, handle, or tall plate, reload that area.
Keep the drain path clear
Check the sink drain, garbage disposal, air gap if installed, and drain hose routing.
Run hot water before starting
Let the kitchen faucet run until hot, then start the dishwasher. This helps cleaning performance, especially in colder months.
Inspect the door gasket
Wipe the gasket with a damp cloth. Remove food bits that could break the seal.
Pay attention to early warning signs
Slow draining, cloudy dishes, standing water, grinding sounds, or repeated wet dishes often appear before a full error code shutdown.
The best next step when a code appears
A Bosch dishwasher error code is useful because it narrows the problem. Start with the safest basics: reset the unit, clean the filter, check the drain path, confirm the water supply, and look for visible leaks. Codes like `E22`, `E24`, and sometimes `E25` often clear after careful cleaning.
For leak, heating, electrical, and control faults, do not keep restarting the dishwasher and hoping the code disappears. Shut off power and water when needed, write down the exact code, note when it appears, and call a professional if the issue points beyond routine cleaning. That approach protects the appliance, the kitchen floor, and your time.
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