Bosch dishwashers earn their reputation for reliability, but even the best appliances develop problems from time to time. When something goes wrong, your Bosch dishwasher does something clever: it tells you exactly what the problem is through an on-screen error code. Rather than leaving you guessing, each code points directly at the specific component or system that needs attention.
This guide translates every common Bosch dishwasher error code into plain English, shows you what to check first, and tells you when a DIY fix is realistic and when you genuinely need a professional.
How A Bosch Dishwasher Displays Error Codes
Bosch communicates faults through two different methods, and knowing which type your model uses is the essential first step. Both formats carry the same diagnostic information, so neither approach leaves you at a disadvantage.
Digital Display Models
Most modern Bosch dishwashers show alphanumeric error codes directly on the control panel, such as E15, E24, or E09. These codes appear automatically when the machine detects a fault, and they stay visible until the underlying issue clears.
LED Blink Models
Older Bosch models without a digital screen communicate through LED blink patterns instead. Count the number of blinks in a repeating sequence and match that number to the corresponding error code in your model’s user manual. The blink count differs across model generations, so always confirm with your specific manual.
How to Reset a Bosch Dishwasher
Before diagnosing any code, always try a reset first. Open the door, press and hold the Start button for three to five seconds until the active indicator light goes out, then close the door and wait one minute before starting a new cycle. Alternatively, cut power at the circuit breaker for 30 seconds, then restore it. If the code clears and does not return, a temporary electronic glitch caused it. If the same code reappears, the underlying issue needs proper attention.
Bosch Dishwasher Error Codes by Category
Bosch groups its faults into logical categories based on the system affected. Understanding this grouping helps you narrow down the cause before you even open the door. The sections below cover each category with specific codes, clear causes, and actionable fixes.
Temperature and Heating Faults
Temperature errors are among the most frequently reported Bosch dishwasher error codes. They tell you the machine cannot heat water to the required temperature for effective cleaning.
E01 and E09 both relate to heating failures, though from different angles. E01 points to a control board relay fault, meaning the board is not correctly supplying power to the heating element. E09, on the other hand, indicates the heating element itself has burned out. Start with a full power cycle reset for either code. If E01 returns, the control board likely needs professional diagnosis. If E09 persists, use a multimeter to test the heating element for continuity and replace it if the reading fails.
E1 and E2 indicate a fault with the temperature sensor or thermistor. The thermistor monitors water temperature throughout the cycle and signals the control board when target temperatures are reached. Test it with a multimeter for continuity, and replace it if it fails. This is a manageable DIY task on most Bosch models with basic tools and the correct part.
Water Supply and Fill Faults
Water supply errors tell you the machine is not receiving enough water to start or complete a cycle. Fortunately, these are often among the easiest errors to resolve without any tools at all.
E3 means the dishwasher failed to fill within the expected time window. Start by confirming the water supply valve under the sink sits fully open, then inspect the inlet hose for kinks, bends, or cracks. If both check out, the water inlet valve’s internal screen may have a sediment blockage. Remove the inlet hose connection and clean the screen under running water to restore flow.
E5 points to the opposite problem: the dishwasher is filling with too much water. A faulty float switch is the most common cause. The float switch monitors water volume inside the tub and signals the inlet valve to stop when the level is sufficient. When it sticks or fails, overfilling occurs and E5 appears. Locate the float switch in the base of the tub and test whether it moves freely.
E4 signals a water flow sensor fault, usually caused by calcium buildup on the sensor wheel. In hard water areas, mineral deposits accumulate on the sensor over time and interfere with accurate flow detection. Replace the water flow sensor to resolve this code.
Drainage Faults
Drainage errors make up the single largest category of Bosch dishwasher error codes. The good news is that most Bosch dishwasher drainage faults stem from blockages you can clear yourself in under 30 minutes.
E22 tells you the fine filter is blocked with food debris or calcium buildup. Remove the filter assembly at the bottom of the tub, rinse it thoroughly under running warm water, and use a soft brush to clear any stubborn residue. Reinstall it firmly and run a short cycle to confirm the error clears.
E24 indicates the drain filter is blocked and the machine cannot complete the drain cycle. Additionally, check the drain hose for kinks and confirm the air gap, if your installation includes one, is clear of debris. A blocked air gap beside the sink faucet frequently causes intermittent E24 errors that the filter alone cannot explain.
E25 points specifically to the drain pump as the source of the blockage. Pry off the drain pump cover at the base of the tub (a spoon handle works well for this), remove any debris from the impeller, and check for lodged objects like glass fragments, seeds, or food particles that prevent the pump from spinning. Reinstall the cover firmly and confirm it clicks into place before running the machine again.
Leak and Flood Faults
Leak codes demand the most urgent response of any Bosch dishwasher error code category. Acting immediately when these appear protects your flooring, cabinetry, and the dishwasher itself from additional damage.
Error Code E15 means the anti-flood system has activated: water has accumulated in the base tray beneath the unit and triggered the flood sensor. Cut power immediately. Some owners resolve minor E15 events by carefully tilting the dishwasher backward at a 45-degree angle to drain the base tray, though finding and fixing the actual leak source is always the necessary next step. Inspect all hose connections at the inlet valve, circulation pump, and drain pump for looseness or damage.
E14 points to a flow meter failure, typically caused by a blockage inside the flow meter or a faulty sensor. Turn off the water supply valve immediately and contact Bosch customer support or a certified technician before running the machine again. This code requires specialist diagnosis to avoid worsening an active water flow issue.
Control and Door Faults
Control and door faults cover the electronic and mechanical systems that manage how the dishwasher operates. Some of these resolve with a simple reset, while others point to component failures requiring professional attention.
E06 means the control panel does not detect that the door is fully closed and latched. Check the door latch mechanism for visible misalignment or damage and press the door firmly shut. If the latch clicks into place but E06 persists, the door switch has likely failed and needs replacement. This is a straightforward part swap on most Bosch models.
E01 through E05 all relate to power module or control board faults. These codes indicate that the main control board has experienced an internal failure. Bosch locks the programming of replacement control boards to certified technicians, which means a reset is the only DIY step available. If the code returns after a full power cycle reset, schedule a service call with a Bosch-certified technician.
H24 is not a fault at all. It simply means the delay start function is active and the machine is waiting for a scheduled cycle time. Turn the dishwasher off for three to five minutes, turn it back on, and press Start for 10 seconds to clear the delay setting.
Complete Bosch Dishwasher Error Code Quick Reference
| Code | Meaning | DIY Fix? | First Action |
|---|---|---|---|
| E01 | Control board relay or heating fault | No | Reset; call technician if persistent |
| E02 | Control board heater relay fault | No | Power cycle reset; replace board if needed |
| E03 | No water fill / auxiliary heater fault | Partial | Check inlet valve and water supply |
| E04 | Water flow sensor fault (calcium buildup) | Yes | Replace flow sensor |
| E05 | Overfill or motor speed error | Partial | Reset; check float switch |
| E06 | Door not detected as closed | Yes | Check latch; replace door switch if needed |
| E09 | Heating element failure | Yes | Test with multimeter; replace element |
| E1/E2 | Temperature sensor or thermistor fault | Yes | Test with multimeter; replace sensor |
| E3 | No fill within expected time | Yes | Check supply valve and inlet hose |
| E5 | Overfill condition | Yes | Check float switch |
| E14 | Flow meter fault | No | Cut water; contact Bosch support |
| E15 | Flood sensor activated (water in base) | Partial | Cut power; tilt to drain; find leak |
| E22 | Fine filter blocked | Yes | Remove and clean filter |
| E24 | Drain filter blocked or drain hose kinked | Yes | Clean filter; check hose and air gap |
| E25 | Drain pump blocked | Yes | Remove pump cover; clear debris |
| H24 | Delay Start active | Yes | Reset and press Start for 10 seconds |
Reset vs. Repair: When Each Applies
Knowing which situation calls for which response saves you from making a bad problem significantly worse. Here is a straightforward guide for the most common scenarios.
| Situation | Recommended Response |
|---|---|
| Code appears for the first time | Try button reset or power cycle first |
| E15 or E14 appears | Cut power and water immediately |
| Same code returns after reset | Begin physical diagnosis |
| Code returns after two resets | Assume component fault; stop running machine |
| E01 through E05 persists | Contact Bosch certified technician |
| Drain codes (E22, E24, E25) | Clean filter and pump before calling anyone |
Preventing Bosch Dishwasher Error Codes: A Maintenance Schedule
Consistent maintenance eliminates the majority of Bosch dishwasher error codes before they ever appear. Each of these habits directly addresses the root cause of the most common fault categories.
| Task | Frequency | Codes Prevented |
|---|---|---|
| Clean fine filter | Monthly | E22, E24, E25 |
| Run dedicated dishwasher cleaner | Every 1 to 3 months | E12, E22, E24 |
| Descale in hard water areas | Every 3 to 6 months | E12, E1, E2 |
| Inspect door gasket | Every 3 months | E15 |
| Check and straighten drain hose | Annually | E24, E25 |
| Inspect all hose connections | Annually | E14, E15 |
Products That Help You Stay Ahead of Error Codes
These three Amazon products directly address the maintenance tasks that prevent the most common Bosch dishwasher error codes from appearing in the first place.
Bosch 312477 Dishwasher Cleaner, 4-Pack
This is Bosch’s own branded dishwasher cleaner, specifically formulated for Bosch, Siemens, Neff, and Gaggenau machines. Each pack contains four cleaning bags totaling 6.4 oz, providing four dedicated cleaning cycles that remove limescale, grease, and odor-causing residue from the pump, filter, and internal hoses. Buyers consistently report improved drainage performance and cleaner interiors after use, and the formula directly addresses the limescale buildup that causes E12, E22, and heating-related error codes in hard water areas. Using a genuine Bosch cleaner rather than a generic alternative ensures compatibility with Bosch’s stainless steel tub and condensation drying system.
Bosch 312477 Dishwasher Cleaner
The Bosch Dishwasher Cleaner is one of those small maintenance products that can make a noticeable difference if your dishwasher is starting to smell a little off or isn’t cleaning as well as it used to. It helps clear out grease, food residue, and buildup hiding inside areas you normally cannot reach, like the spray arms and internal hoses. The cleaner is very easy to use — you just run it through an empty cycle — and many people use it monthly to keep their dishwasher fresh and performing properly. While it is made for Bosch dishwashers, it also works well with most other dishwasher brands.
Frequently Asked Questions
What do Bosch dishwasher error codes look like?
Most Bosch dishwashers display error codes as a letter followed by a number, such as E15, E24, or E09, on the front control panel. Older models without a digital display show a corresponding LED blink sequence instead. Always check your specific model’s user manual to confirm the blink code translation, as the pattern varies across model generations.
How do I reset a Bosch dishwasher to clear an error code?
Press and hold the Start button for three to five seconds until the active light goes out, then close the door and wait one minute before starting a new cycle. Alternatively, cut power at the circuit breaker for 30 seconds and restore it. If the error code reappears after the reset, a physical component fault requires diagnosis rather than another reset attempt.
Can I run my Bosch dishwasher while an error code is showing?
It depends on the specific code. E22 and E24 often allow limited operation, though Bosch recommends against it. However, never run the machine with an active E15 or E14 code, as doing so risks serious water damage and further component failure. When in doubt, cut power and diagnose the issue before running another cycle.
Why does E15 keep coming back even after I drain the base tray?
E15 returns when water continues leaking into the base tray. Draining the tray clears the immediate symptom but does not fix the source of the leak. Inspect all internal hose connections, the door gasket, and the door seal for damage, wear, or looseness. A recurrent E15 consistently points to an ongoing leak that a technician may need to locate if it is not visibly accessible.
How often should I clean the Bosch dishwasher filter?
Bosch recommends cleaning the filter at least once per month for average household use. In households that run the dishwasher daily or rarely pre-rinse dishes, cleaning every two weeks prevents the buildup that triggers E22, E24, and E25 drainage errors. The filter twists counterclockwise to remove and rinses clean under warm running water.
Is the Bosch E12 error code serious?
E12 indicates significant limescale buildup inside the dishwasher, particularly in hard water areas. It is not an immediate emergency, but it is important to address it promptly. Left unchecked, limescale restricts water flow, reduces heating efficiency, and eventually damages the pump and heating element. Running a dedicated descaling cycle with a Bosch-compatible descaler usually resolves E12 without any parts replacement needed.
Fix It Now Before It Becomes a Bigger Problem
Most Bosch dishwasher error codes are manageable situations, not appliance death sentences. A clean filter, a clear drain hose, and a quarterly cleaning cycle prevent the vast majority of faults that homeowners encounter. The codes your machine displays are genuinely useful signals pointing you toward a specific, fixable cause.
Act on every code the first time it appears, stock the right maintenance products, and commit to a simple monthly routine. Do that consistently and your Bosch dishwasher will reward you with years of quiet, reliable, error-free performance. Start with the reset, follow the steps above for your specific code, and take action today before a minor issue becomes an expensive one.
Hi, I’m Barlgan! I created Repair Me Yourself to empower homeowners to tackle appliance repairs with confidence. From decoding error codes to fixing cooling issues, I break down complex repairs into simple, actionable steps that save you time and money.