Bosch Dishwasher Error Codes & Troubleshooting Guide

Complete Bosch Dishwasher Guide

This guide explains all Bosch Dishwasher error codes (CH series) with simple troubleshooting steps to help you identify and fix common issues safely before calling a technician.

E01
Heating Element Fault
  • Check heating element continuity.
  • Inspect wiring connections.
  • Reset dishwasher power.
  • Replace heating element if faulty.
E09
Heating Circuit Failure
  • Inspect heating circuit components.
  • Check wiring and connectors.
  • Verify heater operation.
  • Replace faulty parts if necessary.
E11
NTC Temperature Sensor Fault
  • Inspect temperature sensor wiring.
  • Check sensor resistance values.
  • Ensure connectors are secure.
  • Replace sensor if defective.
E13
Water Temperature Too High
  • Allow appliance to cool.
  • Check temperature sensor.
  • Inspect heating system operation.
  • Restart dishwasher.
E03
Drain Pump Failure
  • Inspect drain pump for blockage.
  • Check pump wiring connections.
  • Clean pump housing.
  • Replace pump if faulty.
E04
Water Inlet Issue
  • Ensure water tap is open.
  • Check inlet hose for kinks.
  • Clean inlet filters.
  • Verify water pressure.
E14
Water Flow Sensor Fault
  • Inspect flow sensor connections.
  • Check for water supply restrictions.
  • Clean sensor if accessible.
  • Replace sensor if defective.
E18
Water Supply Blocked
  • Open water supply valve fully.
  • Inspect inlet hose.
  • Clean inlet filter screens.
  • Verify adequate water pressure.
E24
Drain Blockage or Hose Kinked
  • Inspect drain hose for kinks.
  • Clean drain filter.
  • Check sink drain connection.
  • Run a drain cycle.
E15
Water Leak Detected (AquaStop)
  • Turn off dishwasher immediately.
  • Inspect for leaks underneath.
  • Dry base tray if safe.
  • Repair source of leak.
E16
Inlet Valve Stuck Open
  • Turn off water supply.
  • Inspect inlet valve operation.
  • Check valve wiring.
  • Replace valve if needed.
E17
Water Flow Too Strong
  • Check household water pressure.
  • Inspect inlet valve operation.
  • Verify pressure regulator settings.
  • Restart appliance.
E07
Circulation Pump Failure
  • Inspect circulation pump.
  • Check electrical connections.
  • Remove debris if present.
  • Replace pump if faulty.
E20
Pump Motor Issue
  • Inspect motor wiring.
  • Check for obstructions.
  • Test motor operation.
  • Replace motor if defective.
E21
Pump Blockage or Failure
  • Clean pump housing.
  • Remove foreign objects.
  • Inspect impeller movement.
  • Replace pump if necessary.
E19
Internal Electrical Fault
  • Reset power to dishwasher.
  • Inspect internal wiring.
  • Check control module.
  • Contact service technician.
E90-E99
Control Board Failure Range
  • Turn power off for 10 minutes.
  • Inspect control board connections.
  • Check for moisture damage.
  • Replace control module if required.
E02
Main Control Module Error
  • Restart dishwasher.
  • Inspect control board wiring.
  • Check power supply stability.
  • Replace control board if needed.
E05
Water Distribution System Fault
  • Inspect spray arm operation.
  • Check diverter motor.
  • Clean spray arm nozzles.
  • Replace faulty components.
E06
Door Sensor Error
  • Ensure door is fully closed.
  • Inspect door latch.
  • Check sensor wiring.
  • Replace sensor if faulty.
E08
Low Water Level Detected
  • Verify water supply.
  • Inspect inlet valve.
  • Check water level sensor.
  • Restart dishwasher.
E10
Heating System Malfunction
  • Inspect heating components.
  • Check electrical connections.
  • Verify thermostat operation.
  • Replace faulty parts.
E12
Limescale Build-Up Detected
  • Run a dishwasher cleaner cycle.
  • Remove limescale deposits.
  • Use dishwasher salt regularly.
  • Check water hardness settings.
E22
Filter Blocked
  • Remove and clean filter.
  • Clear food debris.
  • Reinstall filter correctly.
  • Run rinse cycle.
E23
Drain Pump Electrical Fault
  • Inspect drain pump wiring.
  • Check electrical continuity.
  • Test pump operation.
  • Replace faulty pump.
E25
Drain Pump Blocked
  • Remove pump cover.
  • Clear foreign objects.
  • Inspect impeller movement.
  • Reassemble and test.
E27
Low Supply Voltage
  • Check household voltage.
  • Avoid extension cords.
  • Inspect power connections.
  • Contact electrician if needed.
H01-H24
Delay Start Active
  • This is not a fault code.
  • Delay start has been enabled.
  • Wait for countdown to finish.
  • Cancel delay start if desired.
CL
Child Lock Enabled
  • Press and hold Child Lock button.
  • Refer to model-specific instructions.
  • Wait for CL indicator to disappear.
  • Resume normal operation.
CHECK WATER
Water Supply Warning
  • Ensure water tap is open.
  • Check inlet hose for kinks.
  • Clean inlet filter screens.
  • Verify water pressure.
REFILL RINSE AID
Rinse Aid Low
  • Open rinse aid dispenser.
  • Fill with approved rinse aid.
  • Close dispenser securely.
  • Reset indicator if necessary.
REFILL SALT
Salt Low
  • Refill dishwasher salt reservoir.
  • Use dishwasher-grade salt only.
  • Wipe away spilled salt.
  • Run a rinse cycle if needed.

Frequently Asked Questions


Why is my Bosch dishwasher not starting?
Check if the door is fully closed and latched. Ensure the dishwasher has power supply. Disable child lock if activated. Check delayed start settings.
Why is my Bosch dishwasher not cleaning dishes properly?
Clean spray arms for blockages. Do not overload racks. Use proper detergent and rinse aid. Check water pressure is sufficient.
Why is my Bosch dishwasher not draining?
Clean dishwasher filter. Check drain hose for clogs or bends. Inspect drain pump for debris. Ensure sink drain is not blocked.
Why is my Bosch dishwasher leaking water?
Inspect door seal for damage. Check hose connections for looseness. Avoid excessive detergent use. Check for cracks in internal components.
Why are dishes still wet after cycle?
Refill rinse aid dispenser. Use drying or extra dry mode. Avoid blocking airflow between dishes. Check drying fan function (if applicable).
Why does my Bosch dishwasher make noise?
Check for loose spray arms. Remove debris from pump area. Ensure dishes are not hitting each other. Inspect motor or circulation pump.
How do I reset my Bosch dishwasher?
Hold the Start/Reset button for a few seconds. Turn power off for 5–10 minutes. Restart the cycle after reset. Check if error clears after reboot.
Why is my Bosch dishwasher not filling with water?
Ensure water supply tap is open. Clean inlet filter screen. Check inlet hose for blockage. Inspect water inlet valve.
Why does my Bosch dishwasher smell bad?
Clean filter regularly. Remove trapped food debris. Clean door gasket and seals. Run a cleaning cycle with dishwasher cleaner.
How often should I clean Bosch dishwasher filter?
Clean at least once a week. Clean more often with heavy use. Rinse under running water. Check sump area for debris.
Why is my Bosch dishwasher cycle so long?
Eco mode increases cycle time. Heavy soil sensors extend wash duration. Low water temperature slows cycle. Normal for energy-saving programs.
Can I open Bosch dishwasher mid-cycle?
Yes, but cycle will pause automatically. Be careful of hot steam when opening. Close door to resume cycle. Avoid interrupting wash repeatedly.
Why are glasses cloudy after washing?
Use rinse aid regularly. Check water hardness settings. Avoid excess detergent. Clean dishwasher interior periodically.
What if Bosch dishwasher errors keep coming back?
Try resetting the dishwasher. Check for recurring blockages or leaks. Update maintenance routine. Contact technician if issue persists.
Important: Always disconnect power before performing repairs. Contact a qualified technician if the issue persists.