Bosch Dishwasher Error Codes Solved
Your Bosch dishwasher just flashed an error code. Whether it shows E15, E24, or E09, these alphanumeric alerts are your appliance’s way of telling you exactly what is wrong. Ignoring them can lead to poor cleaning, water leaks, or permanent damage to internal components.
This guide covers every major Bosch dishwasher error code from E01 to E27, plus H-codes, flashing light patterns, and beeping sounds. You will learn how to identify the problem, perform quick fixes yourself, and know when to call a professional. Most importantly, you will save time and money with step-by-step troubleshooting based on technical specifications.
What Do Bosch Dishwasher Error Codes Mean
Bosch dishwashers use E-codes to signal internal faults. Each code points to a specific system failure, from heating problems to water flow issues. Understanding these codes helps you diagnose problems quickly without waiting for a technician.
The system also uses H-codes for time delays and flashing lights for model-specific alerts. Many users mistake H08 for an error when it simply means an 8-hour delay is set. Knowing the difference between error codes and settings prevents unnecessary worry.
Fix E01 Heat Pump Relay Failure
E01 indicates a fault in the heat pump motor circuit or a relay on the main control board. This error stops heating and may halt the cycle entirely.
Symptoms include no hot water, incomplete drying, or the dishwasher stopping mid-cycle. The most common cause is a power surge damaging the control board relay.
Fix steps:
• Turn off power at the breaker for 5 minutes
• Restore power and run a rinse cycle
• If error returns, the control board or heat pump needs replacement
Pro Tip: Power surges often trigger E01. Using a surge protector prevents this issue.
Resolve E02 and E03 Control Board Relay Faults
Both E02 and E03 point to a failed relay on the main control board. These are serious errors that prevent proper dishwasher operation.
The cause is usually moisture exposure, electrical surge, or component aging. No user repair is possible for these faults.
Fix steps:
• Perform a 5-minute power reset
• If error persists, replace the control board
• Contact a technician for board replacement
Warning: DIY control board replacement risks electrical shock. Hire a professional.
Handle E04 Heater Circuit Failure
E04 means the dishwasher detected a fault in the heating system during self-test. This relates to the heating element, temperature sensor, or control board heating circuit.
Possible causes include a failed heating element, bad temperature sensor, or control board issue. No DIY fix is available for this error.
Action: Contact Bosch support immediately. This requires professional diagnosis and repair.
Repair E05 Spray Arm Diverter Fault
E05 means the diverter motor is not directing water to the correct spray arms. This affects cleaning performance across all racks.
Check the diverter motor for obstructions and inspect wiring connections. The motor may be jammed by food debris or damaged by wear.
Fix steps:
• Perform a power reset
• Clear debris from the diverter mechanism
• If unresolved, replace the diverter motor
Fix E06 Door Not Latching Error
E06 triggers when the dishwasher cannot detect a fully closed door. This prevents any cycle from starting.
Also shows as E8000 on some models. Causes include misaligned latch, damaged switch, or debris in the door seal.
Fix steps:
• Close the door firmly
• Check for dishes blocking closure
• Clean the gasket and inspect the latch
• Test the door switch with a multimeter if needed
Repair E07 CrystalDry Fan Failure
E07 affects models with Zeolite drying (CrystalDry). The fan motor that circulates air has failed or is blocked.
Symptom is wet plastic containers after the cycle ends. The cause is either a failed fan motor or blocked airflow.
Fix steps:
• Perform a power reset
• Clean the fan housing under the tub
• Remove food particles or grease blocking the fan
• If the fan still does not work, replace the motor
Fix E09 and E20 Heat Pump Heater Fault
E09 and E20 mean the internal heater in the heat pump is not working. These are common in Bosch 800 Series heat pump models.
Alternate codes include E2030, E6001, and flashing Active plus Sanitized lights. The heating element should read 15 to 30 ohms when tested. The temperature sensor should read 10 to 15 kΩ at room temperature.
Fix steps:
• Run a 30-second power reset
• Descale the system (limescale causes overheating)
• Replace the heater or NTC sensor if testing shows failure
Professional repair is recommended for this error.
Repair E10 CrystalDry Chamber Heater Fault
E10 means the heater inside the Zeolite chamber is broken. This results in poor drying performance, especially on plastic items.
Fix steps:
• Reset power
• If the error returns, the heater must be replaced by a technician
Models affected include Bosch 800 Series with CrystalDry.
Clear E12 Limescale Buildup Warning
E12 is a hard water alert. Mineral buildup in the heat pump is reducing efficiency.
Also shows as E2060 on some models. This is common in areas with water hardness above 7 gpg.
Fix steps:
• Run an empty cycle with 1 cup white vinegar or Bosch descaler
• Repeat every 1 to 3 months depending on water hardness
Prevention includes using dishwasher salt weekly and installing a water softener if needed.
Fix E14 Water Flow Issue
E14 means water is not entering the dishwasher properly. This is a common supply problem.
Causes include kinked hose, clogged filter, or low water pressure. The inlet filter at the water valve is often the culprit.
Fix steps:
• Check the inlet hose for kinks
• Clean the inlet filter at the water valve
• Ensure water flow is at least 10 liters per minute
• If still not filling, replace the flow meter or inlet valve
Resolve E15 Water in Base Pan (Most Common Error)
E15 is the most frequent Bosch error. Water in the base pan triggers the flood switch, showing a water tap icon and blinking red floor light.
This often occurs from a one-time splash, not an actual leak. The float in the base pan is highly sensitive.
Fix steps:
• Turn off water and power
• Remove the kick plate with a Torx T20 screwdriver
• Drain water using towels or a shop vac
• Lift out the white polystyrene float, clean, and dry it
• Reinstall and press Start for 3 seconds to reset
Pro Tip: Cleaning the float fixes 90% of E15 cases.
Fix E16 Inlet Valve Stuck Open
E16 means the water inlet valve will not shut off. This risks overfilling and leaks.
Fix steps:
• Inspect the inlet hose
• Confirm the water valve is fully open
• Replace the inlet valve if the problem continues
Replacement cost is $27 to $56.
Handle E17 Water Level Too High
E17 indicates overfilling due to inlet valve failure or a control board issue.
Fix steps:
• Slightly close the water supply valve
• Replace the inlet valve if the problem persists
Fix E18 Low Water Level
E18 means not enough water is entering the dishwasher. This causes poor cleaning performance.
Causes include a partially closed valve, kinked hose, or low household pressure.
Fix steps:
• Verify the water valve is fully open
• Check the hose for blockages
• Perform a power reset
• Inspect the pump and flow sensor if the problem continues
Repair E19 Detergent Dispenser Failure
E19 means the detergent door is not opening. The dispenser solenoid has failed or is jammed.
Fix steps:
• Perform a power reset
• Clean the dispenser tray and check for residue
• Ensure the lid moves freely
• If still stuck, replace the solenoid
Clear E21 Heat Pump Blockage
E21 signals a physical obstruction in the heat pump or circulation pump.
Fix steps:
• Perform a power reset
• Remove and clean the circulation pump
• Check for food debris or grease
• If the pump is not spinning, professional service is needed
Fix E22 Blocked Filter Error
E22 means the drain filter is clogged. This causes standing water and gurgling noises.
Fix steps:
• Remove the filter by twisting counterclockwise
• Wash under running water with a soft brush
• Clean the sump area beneath the filter
• Reinstall securely
Prevention: Clean the filter monthly, or weekly with heavy use.
Handle E23 Drain Pump Failure
E23 means the drain pump is not working. No user fix is available for this error.
Action: Contact Bosch support. Replacement costs $40 to $140. This is a high-difficulty repair best left to professionals.
Fix E24 Drainage Problem
E24 points to a blocked filter or loose pump cover. This is closely related to E22.
Fix steps:
• Remove the filter
• Check the pump cover to ensure it is tight
• If connected to a garbage disposal, confirm the drain plug is removed
• Run the disposal before starting the dishwasher
Repair E25 Pump Cover Issue
E25 means the drain pump cover is dislodged or missing. This blocks drainage.
Fix steps:
• Remove the filter
• Pry off the cover with a spoon until it clicks
• Pull up and forward to remove
• Clear debris and water
• Reinstall the cover firmly
Caution: Glass shards or sharp objects may be inside.
Fix E27 Low Voltage Detected
E27 means incoming power is too low. This affects all dishwasher functions.
Causes include an overloaded circuit or poor electrical connection.
Fix steps:
• Reset the circuit breaker for 30 seconds
• Ensure the dishwasher is on a dedicated circuit
• Avoid sharing with a microwave or oven
• If still flashing, call an electrician
Understanding H-Codes Are Not Errors
Many users mistake H-codes for malfunctions. H08 does not mean a heating error. It means the dishwasher will start in 8 hours.
H08 is a time delay setting. Press Delay Start until the display shows H:00, then press Start to begin immediately.
Other H-codes include H01 for 1-hour delay, H12 for 12-hour delay, and H24 for 24-hour delay. Pressing Delay Start cycles through H:01 to H:24, then resets to H:00.
What Flashing Light Patterns Mean
Some Bosch models use lights instead of error codes. Flashing Active lights indicate a general technical issue. Fix by pressing ON/OFF, disconnecting power for 2 minutes, and restoring power.
Flashing Clean light means a door sensor fault. Close the door fully and reset power.
Flashing Sanitized light indicates a control board relay issue. Reset power, and if it persists, contact a technician.
Flashing Active plus Sanitized means a heat pump heater fault (E09 or E20). Reset and expect to need service.
Flashing Active plus Clean means a drain or filter issue (E22, E24, E25). Clean the filter, check the pump cover, and inspect hoses.
Four LEDs flashing indicates a drain system fault. Inspect and clean all drain components.
What Beeping Sounds Signal
Your dishwasher may beep to signal problems. Beeping but not starting means the door is not latched. Close the door firmly or replace a broken latch.
Three beeps indicate water in the base pan (E15). Clean the filter, inspect hoses, and dry the float.
Five beeps mean a persistent leak or sensor trigger. Check for ongoing leaks and call a technician if unresolved.
Beeps with no display suggest control board damage. Reset at the breaker for 10 minutes. If no display returns, replace the control board.
How to Reset Your Bosch Dishwasher
A reset clears temporary errors and restarts the system. This is often the first step before troubleshooting.
Soft Reset: Press and hold Start for 3 to 5 seconds. Use this for transient issues like sensor glitches.
Hard Reset: Turn off power at the circuit breaker. Wait 3 to 5 minutes to let capacitors discharge. Restore power. Press Start for 3 seconds on some models. Run a short rinse cycle to test.
Note: A hard reset fixes many E-codes, especially E15, E22, and E24.
Prevent Errors With Routine Maintenance
Most Bosch errors are preventable with simple upkeep. Clean the filter monthly to prevent E22, E23, E24, and E25.
Descale every 3 months to stop E12, E09, and E21. In hard water areas, do this more frequently.
Refill salt and rinse aid regularly. Salt keeps water soft and prevents limescale. Rinse aid improves drying and prevents spots.
Inspect hoses biannually. Check inlet and drain hoses for kinks, cracks, or clogs. This prevents E14, E16, E18, and E24.
Keep the unit level. An unlevel dishwasher can leak and trigger E15. Use a level during installation.
When to Call a Professional
Some errors require expert help. Call Bosch support if the error involves the control board (E01, E02, E03), heating element or pump is faulty (E04, E23), or electrical components need replacement.
Also call if the error returns after reset and cleaning. Have your model and serial number ready.
Bosch USA Support is 1-800-944-2904.
Key Takeaways for Fixing Bosch Dishwasher Error Codes
Most Bosch error codes are easy to fix with a power reset, filter clean, or hose check. Start with the basics because 90% of E15 and E22 errors are fixed by cleaning the filter or float.
Descaling is essential in hard water areas. Skip it and risk $100 or more in heat pump repairs. Never ignore E15 because repeated leaks can damage flooring and subfloor.
Use genuine parts for replacements. Aftermarket inlet valves or pumps may fail prematurely. Register your warranty to extend coverage if possible.
Save hundreds by diagnosing the issue yourself, then act fast before small problems become expensive repairs.
Frequently Asked Questions About Bosch Dishwasher Error Codes
What is the most common Bosch dishwasher error code?
E15 (water in base pan) is the most common error. It usually occurs from a one-time splash triggering the flood switch. Cleaning the float in the base pan resolves over 90% of cases.
How do I reset my Bosch dishwasher after an error?
Perform a hard reset by turning off power at the circuit breaker for 3 to 5 minutes. Restore power and press Start for 3 seconds. Run a short rinse cycle to test if the error cleared.
Are H-codes errors on Bosch dishwashers?
No. H-codes like H08 are time delay settings, not errors. H08 means the dishwasher will start in 8 hours. Press Delay Start until display shows H:00 to cancel.
Can I fix E22 (blocked filter) myself?
Yes. Remove the filter from the bottom of the tub, wash it under running water with a soft brush, clean the sump area beneath, and reinstall by twisting until it locks. Clean monthly to prevent recurrence.
Why does my Bosch dishwasher beep 3 times?
Three beeps indicate E15, meaning water is in the base pan. Check the drain filter, inspect hoses for leaks, and clean the float in the base pan.
When should I call a professional for a Bosch dishwasher error?
Call a professional for E01, E02, E03 (control board issues), E04, E09, E20 (heating elements), and E23 (drain pump failure). These involve electrical components that are dangerous to repair without training.
