Bosch Dishwasher Fault Codes: What They Mean and How To Fix Them
Your Bosch dishwasher has stopped mid-cycle and is showing a fault code. Maybe it’s E15, E24, E25, or one of the less common codes like E09, E22, E17, or H01. Either way, the code tells you something specific — and in most cases, the fault is diagnosable at home.
This page covers every common Bosch dishwasher fault code, what each one means, and which of the three most common codes have their own dedicated guides. If you need the complete diagnostic sequence for a specific code, the guides are linked at the bottom.
Quick Diagnosis
E15: flood protection has triggered. Water is in the base tray.
E24: drain fault. Usually a blocked filter or drain hose.
E25: drain fault. Usually the drain pump itself.
E09: heating fault. The heating element or sensor has failed.
E22: filter or drain fault. Often a blocked filter.
E17: water inlet fault. The machine isn’t filling properly.
H01: heating fault. The heating circuit has failed.
What Bosch Fault Codes Mean
Bosch dishwashers use a fault code system that displays as a letter and a two-digit number — E15, E24, E25, and so on. The codes are consistent across most Bosch models manufactured in the last 15 years.
Each code points to a specific fault. Some codes have more than one possible cause, and the diagnostic sequence narrows it down.
E15 — Flood Protection Triggered
E15 is the most common Bosch fault code. It means the flood protection system has triggered. Water has collected in the base tray, the float switch has risen, and the machine has shut down to prevent flooding.
This is a safety code, not a fault in itself. The machine is working correctly. It has detected water where there shouldn’t be water.
Seeing E15 specifically? It’s the most common Bosch dishwasher code, and the most misunderstood — it means water has collected in the base tray and tripped the flood switch, not that the control board has failed. Read the full E15 fault code diagnosis before ordering any parts.
Common causes:
A failed door seal
A loose hose connection
A cracked hose
Trapped water from a previous fault
Overfilling
A failed sump seal
What to do: check for visible leaks at the door and hoses first. Then access the base tray and drain it if it contains water. Check the float switch moves freely. If the leak keeps returning, the underlying fault hasn’t been fixed.
For the full diagnostic sequence, see the Bosch Dishwasher E15 Fault Code guide.
E24 — Drain Fault (Blockage)
E24 means the machine has tried to drain and failed. It usually points to a blockage in the drain path.
Common causes:
A clogged filter
A blocked or kinked drain hose
Debris in the sump
A blocked check valve
What to do: clean the filter first. That’s the most common cause and it’s free. Then check the drain hose for kinks or blockages.
For the full diagnostic sequence, see the Bosch Dishwasher E24 Fault Code guide.
E25 — Drain Fault (Pump)
E25 also means a drain fault, but with a different cause from E24.
E24 is usually a blockage. The pump is fine — it just can’t push water through the blockage.
E25 is usually the pump itself. The filter and hoses are clear, but the pump isn’t running properly or has debris inside it.
Common causes:
A jammed pump impeller
A failed drain pump
A stuck check valve
Debris in the pump housing
What to do: clean the filter and check the hoses first. If they’re clear, test the drain pump.
For the full diagnostic sequence, see the Bosch Dishwasher E25 Fault Code guide.
E09 — Heating Fault
E09 means the heating circuit has failed. The machine isn’t heating the water.
Common causes:
A failed heating element
A failed temperature sensor
A failed control board
A wiring fault
What to do: check the heating element for continuity with a multimeter. Check the temperature sensor. If both test good, the fault is the control board.
E22 — Filter or Drain Fault
E22 usually points to a blocked filter or a drain fault. On some Bosch models, it can also indicate a water level sensor fault.
Common causes:
A clogged filter
Debris in the sump
A blocked drain hose
A faulty water level sensor
What to do: clean the filter first. Then check the drain path. If both are clear, test the water level sensor.
E17 — Water Inlet Fault
E17 means the machine isn’t filling properly. The water inlet valve may have failed, or the water supply may be restricted.
Common causes:
A closed water supply valve
A kinked inlet hose
A failed water inlet valve
A faulty flow meter
What to do: check the water supply valve is open. Check the inlet hose for kinks. Test the water inlet valve.
H01 — Heating Fault
H01 means the heating circuit has failed, similar to E09. The exact cause varies by model.
Common causes:
A failed heating element
A failed relay on the control board
A wiring fault
What to do: check the heating element for continuity. Check the relay and wiring.
Which Code Do You Have?
Seeing E15 specifically? It’s the most common Bosch dishwasher code, and the most misunderstood — it means water has collected in the base tray and tripped the flood switch, not that the control board has failed. Read the full E15 fault code diagnosis before ordering any parts.
Match your code to the section above. The three most common codes — E15, E24, and E25 — each have their own dedicated guide with the full diagnostic sequence, component testing, and repair-or-bin thresholds.
The other codes — E09, E22, E17, and H01 — are covered in the general Bosch Dishwasher guide.
How Bosch Fault Codes Work
Bosch dishwashers use a combination of sensors and monitoring circuits to detect faults. When a fault is detected, the control board displays the corresponding code and shuts down the cycle.
The code is not a diagnosis. It’s a starting point. Each code narrows the field, but the actual cause must be confirmed with testing.
For example, E15 means flood protection has triggered. The flood protection is a safety system. The actual fault could be a door seal, a hose, a sump seal, or overfilling. Only testing tells you which one.
Common Bosch Fault Codes At A Glance
E15: flood protection. Water in the base tray.
E24: drain fault. Blockage in the filter or hose.
E25: drain fault. Pump fault or debris in the pump.
E09: heating fault. Element, sensor, or board.
E22: filter or drain fault. Usually a blocked filter.
E17: water inlet fault. Valve or supply.
H01: heating fault. Element or relay.
Repair Cost Guide
Door seal: $20 to $50 for the part.
Drain hose: $10 to $30 for the part.
Drain pump: $30 to $80 for the part.
Heating element: $40 to $100 for the part.
Water inlet valve: $20 to $60 for the part.
Control board: $150 to $300.
Temperature sensor: $15 to $40.
When to Repair vs Bin
Repair if:
The fault is a filter, hose, seal, or pump
The dishwasher is under six years old
The repair cost is under half the cost of a comparable new machine
Bin if:
The control board has failed on a machine over eight years old
The machine has multiple failed components
The repair cost exceeds half the cost of a comparable new machine
Safety Warning
Electrical risk. Dishwashers run on mains voltage. Disconnect the power at the circuit breaker before removing any panel.
Water risk. The base tray and sump will contain water. Have towels and a shallow tray ready.
Sharp edges. Dishwasher components can have sharp edges. Handle with care.
FAQ
What do Bosch dishwasher fault codes mean?
Each code points to a specific fault. E15 is flood protection. E24 and E25 are drain faults. E09 and H01 are heating faults. E17 is a water inlet fault.
What is the most common Bosch dishwasher fault code?
E15 is the most common. It means the flood protection has triggered.
Why does my Bosch dishwasher show E15?
Water has collected in the base tray. This is usually caused by a leak or overfilling.
Why does my Bosch dishwasher show E24?
A blockage in the drain path. Usually the filter or the drain hose.
Why does my Bosch dishwasher show E25?
A drain pump fault or debris in the pump. E25 usually means the pump itself, not a blockage.
Can I fix a Bosch dishwasher fault code myself?
Yes, in most cases. Filter cleaning is free. Hose and seal replacements are cheap. Pump and heating element replacements are more involved but still DIY-friendly.
Is it worth repairing a Bosch dishwasher with a fault code?
Usually yes, if the fault is a filter, hose, seal, or pump. If the control board has failed on a machine over eight years old, replacement is usually the better call.
Get the Complete Guides
Each common Bosch fault code has its own dedicated guide with the full diagnostic sequence.
Bosch Dishwasher E15 Fault Code — $3.95
The complete guide to the flood protection error. Diagnose the leak, drain the base tray, and fix the underlying fault.
repairorbin.com/downloads/bosch-dishwasher-e15-fault-code/
Bosch Dishwasher E24 Fault Code — $3.95
The complete guide to the drain error. Diagnose the blockage, clear the filter, and check the drain path.
repairorbin.com/downloads/bosch-dishwasher-e24-fault-code/
Bosch Dishwasher E25 Fault Code — $3.95
The complete guide to the pump error. Diagnose the pump fault, test the impeller, and check the drain path.
repairorbin.com/downloads/bosch-dishwasher-e25-fault-code/
Have More Than One Bosch Problem?
If you’re dealing with several problems rather than a specific code, the Bosch Dishwasher guide covers the most common faults in one reference.
$7.95
Looking for Brand-Specific Guides?
Our brand guides cover washers, dryers, and dishwashers from Fisher & Paykel, Samsung, LG, Bosch, Whirlpool, Maytag, GE, and Miele.
$12.95
Repair or Bin?
Before spending money on a repair, find out what is actually wrong with your appliance.
Repair or Bin gives you the information to diagnose the problem and make an informed repair-or-bin decision.
Related Articles
Bosch Dishwasher E15 Fault Code
Diagnose the E15 flood protection error and fix it step by step.
Bosch Dishwasher E24 Fault Code
Diagnose the E24 drain error and fix it step by step.
Bosch Dishwasher E25 Fault Code
Diagnose the E25 drain error and fix it step by step.
Bosch Dishwasher
Complete diagnostic guide for Bosch dishwashers.
Bosch Fault Diagnosis
The complete Bosch fault reference, covering every common fault in one guide.
It would be useful to add E18 and E:32-00 to the water-supply section for models that use those displays. Their inlet screen is separate from the filter inside the tub, so cleaning the tub filter does not address a restricted incoming supply. This guide explains that distinction and the external checks . Bosch’s own list also covers E18/E3200: https://www.bosch-home.com/us/owner-support/dishwashers/error-codes . Follow the full E-Nr.’s manual, and never bypass or immerse an AquaStop unit.