Bosch Dishwasher Error Codes

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📋 Error Code Index — Bosch Dishwasher

E01Water Intake Fault E02Heating Fault E03Water Drain Fault E04Flow Meter Fault E09Heating Relay Fault E24Drain Hose Blocked

E01

Water Intake Fault

Water not entering appliance within allowed fill time

Medium Priority

Possible Causes
Water supply valve closed or restricted
Inlet valve solenoid failed
Low water pressure below 5 psi minimum
Diagnostic Steps
1Verify water supply valve fully open
2Check household water pressure
3Test inlet valve solenoid and replace if failed

E02

Heating Fault

Water not reaching required temperature within allowed time

Medium Priority

Possible Causes
Heating element failed open circuit
NTC temperature sensor fault
Control board relay not energizing heater
Diagnostic Steps
1Test heating element resistance — OL confirms open circuit
2Test NTC sensor resistance at room temperature
3Replace heating element or NTC sensor as indicated

E03

Water Drain Fault

Appliance not draining within allowed time — water remains in tub

Low Priority

Possible Causes
Drain pump filter blocked with food debris
Drain hose kinked or incorrectly routed
Drain pump motor failed
Diagnostic Steps
1Remove and clean drain pump filter
2Check drain hose for kinks and correct routing
3Test drain pump motor continuity and replace if failed

E04

Flow Meter Fault

Water flow meter not detecting correct flow — water volume cannot be measured

Medium Priority

Possible Causes
Flow meter paddle blocked by debris
Flow meter failed internally
Wiring to flow meter open
Diagnostic Steps
1Inspect and clean flow meter paddle
2Verify paddle rotates freely
3Replace flow meter if still failing

E09

Heating Relay Fault

Control board heating relay failed — heater circuit cannot be switched correctly

High Priority

Possible Causes
Heating relay on control board welded closed or open
Control board internal fault
Diagnostic Steps
1Disconnect power — relay stuck closed is a fire risk
2Test heating circuit continuity with power off
3Replace control board if relay fault confirmed

E24

Drain Hose Blocked

Drain hose sensor detecting blockage or siphon condition

Low Priority

Possible Causes
Drain hose not correctly looped above sink drain level
Drain connection creating siphon effect
Drain hose kinked
Diagnostic Steps
1Ensure drain hose is looped at least 40cm above floor
2Check drain connection — no siphon should form
3Inspect hose for kinks or blockage

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Important Notice: Error code information on this page is based on Bosch manufacturer service documentation. Always disconnect power and water supply before inspecting internal components. Fault behavior may vary by model year. When in doubt, contact a certified technician. AppliancesCare Appliance Repair LLC provides this information for educational purposes only.