Bosch Dishwasher E15 Fault Code? Here’s What It Means (And How To Fix It)
If your Bosch dishwasher is showing E15, it isn’t a control board failure. It’s a flood sensor — water has collected in the base tray and tripped the switch. Here’s how to find the leak, and most of the fixes are free.
E15 means water has collected in the base tray and tripped the flood switch. It is not a control board failure. Turn off the water supply at the tap and don’t run another cycle — then find the leak. The most common causes are a door seal, a loose hose connection, or a blocked drain.
Your Bosch dishwasher is showing E15. The cycle has stopped, the dishes are sitting in water, and the machine won’t respond to anything except a reset.
Here’s the thing most people get wrong: they assume the control board has failed and start looking at replacement machines. In reality, E15 is a safety code. The machine is working correctly. It has detected water in the base tray and shut itself down to prevent flooding.
The fix is to find out where that water came from and stop it. In many cases, that’s free.
This page covers the four most common E15 fault patterns, the symptoms to look for, and the checks you can perform yourself. If you need the complete diagnostic sequence with component testing and repair-or-bin guidance, the full guide is linked at the bottom.
Bosch Dishwasher E15 Fault Code? Diagnosis
Quick Diagnosis
E15 with a visible leak: a door seal, hose, or connection fault.
E15 with no visible leak: trapped water in the base tray, or a hidden internal leak.
E15 after moving the dishwasher: spilled water or a loose connection.
E15 that keeps returning: the underlying fault hasn’t been fixed.
Why Your Bosch Dishwasher Shows E15
E15 is the flood protection error code. Bosch dishwashers have a safety system that detects water in the base of the machine. When water collects in the base tray, a float switch rises, the machine detects it, and the control board shuts down the cycle.
The system exists to prevent flooding. It’s a safety feature, not a fault in itself. The machine is doing exactly what it’s designed to do.
The chain works like this:
Water enters the base tray, either from a leak or from overfilling
The float switch rises with the water level
The switch sends a signal to the control board
The control board shuts down and displays E15
The machine won’t run again until the water is removed and the float drops
Common Causes
Failed door seal. The most common cause. The rubber gasket around the door has worn, cracked, or come loose.
Loose hose connection. A hose clamp has come loose, or a connection has worked free.
Cracked hose. A drain hose or inlet hose has cracked with age.
Trapped water. A previous leak filled the base tray, and it hasn’t been drained.
Overfilling. The machine is taking in too much water, and the excess overflows into the base tray.
Failed sump seal. The seal between the sump and the tub has failed.
Failed pump seal. The drain pump seal has failed.
Blocked drain. Water backs up into the base tray because the drain is blocked.
Symptoms To Look For
The symptom tells you which fault pattern applies.
E15 With a Visible Leak
A door seal, hose, or connection fault. Look for water at the door or under the machine.
E15 With No Visible Leak
Trapped water or a hidden internal leak. Check the base tray.
E15 After Moving the Dishwasher
Spilled water or a loose connection. Draining the tray usually fixes it.
E15 That Keeps Returning
The underlying fault hasn’t been fixed. Find the source before resetting.
How to Diagnose E15
Step 1 — Disconnect the Power and Water
Turn off the dishwasher at the circuit breaker. Shut off the water supply valve.
Step 2 — Check for Visible Leaks
Pull the dishwasher out and look at the floor underneath. Note where the water is pooling.
Check the door seal for cracks, tears, or deformation.
Check all hose connections at the back. Look for loose clamps, drips, or wet patches.
Check the hoses themselves for cracks.
Step 3 — Access the Base Tray
On most Bosch models, you tilt the machine back or remove the base panel to reach the base tray.
Check whether the tray contains water. If it does, drain it and dry it thoroughly.
Step 4 — Check the Float Switch
The float switch sits in the base tray. Press it gently with a finger. It should move up and down freely, with a click at the top.
If the float doesn’t drop when the tray is dry, it’s stuck. Clean around it.
Step 5 — Check the Drain Path
Confirm the drain hose isn’t blocked and the sink connection is clear.
Check the filter inside the machine for blockages.
Step 6 — Run a Test Cycle
With the machine pulled out so you can see underneath, run a test cycle.
Watch for the moment water starts to appear in the base tray. That tells you where the leak is.
Fixing Specific E15 Faults
E15 With a Visible Leak at the Door
A failed door seal. Clean the seal and check for damage. If it’s worn, replace it.
E15 With a Visible Leak Under the Machine
A hose connection or sump fault. Check all connections and look for drips around the sump.
E15 With No Visible Leak
Trapped water. Drain the base tray and reset the float.
E15 After Moving
Spilled water or a loose connection. Drain the tray, then check all hose connections.
E15 That Keeps Returning
An unfixed leak. Find the source before resetting again.
E15 With Water in the Bottom of the Machine
A blocked drain. Check the filter and the drain hose.
Repair Cost Guide
Door seal: $20 to $50 for the part, $50 to $100 fitted.
Hose: $10 to $30 for the part, $40 to $80 fitted.
Hose clamp: $2 to $10.
Float switch: $15 to $40 for the part, $60 to $120 fitted.
Sump seal: $20 to $50 for the part, $100 to $200 fitted.
Pump seal: $15 to $40 for the part, $80 to $150 fitted.
Base tray draining: $0.
When to Repair vs Bin
Repair if:
The fault is the door seal, a hose, a clamp, or trapped water
The dishwasher is under six years old
The repair cost is under half the cost of a comparable new machine
The machine has no other faults
Bin if:
The sump seal 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 may contain water. Have towels and a shallow tray ready.
Sharp edges. Dishwasher components can have sharp edges. Handle with care.
Water damage risk. A recurring leak can damage flooring and cabinetry. Address the fault promptly.
FAQ
What does E15 mean on a Bosch dishwasher?
E15 means the flood protection system has triggered. Water has collected in the base tray and the float switch has shut the machine down.
How do I reset E15 on a Bosch dishwasher?
Drain the base tray, dry it thoroughly, and press the float switch down. Then power the machine back on.
Why does my Bosch dishwasher keep showing E15?
The underlying fault hasn’t been fixed. Water is still reaching the base tray. Find the source before resetting again.
Can E15 be caused by too much detergent?
Yes. Excess suds can cause the machine to overfill, and the excess water can reach the base tray.
Why did E15 appear after I moved my dishwasher?
Tilting the machine can spill water from the sump or internal plumbing into the base tray. Draining the tray fixes it.
Is E15 dangerous?
No. It’s a safety feature. The machine has shut down to prevent flooding.
Is it worth repairing a Bosch dishwasher showing E15?
Usually yes, if the fault is the door seal, a hose, or trapped water. If the sump seal has failed on a machine over eight years old, replacement is usually the better call.
Get the Complete Diagnosis
Need to determine exactly what’s causing the E15 code?
The complete diagnostic guide takes you beyond the basic checks and walks through all four E15 fault patterns step by step.
The complete guide includes:
Float switch testing with expected readings
Base tray inspection and draining
Door seal testing
Hose and connection testing
Sump and pump seal inspection
Overfill diagnosis
Repair and replacement considerations
Repair-or-bin guidance
Bosch Dishwasher E15 Fault Code Repair Guide
Complete diagnostic guide for Bosch dishwashers showing E15.
What’s included:
Diagnosis for all four E15 fault patterns
Step-by-step testing procedures
Float switch and base tray testing
Door seal, hose, and sump testing
Required checks and tools
Repair information
Replacement considerations
Repair-or-bin guidance
Download instantly
$3.95
Have More Than One Dishwasher Problem?
If you’re dealing with several problems rather than just an E15 fault, 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 E24 Fault Code
Diagnose the E24 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.
Dishwasher Not Draining
Diagnose why your dishwasher won’t drain.
Dishwasher Not Cleaning Dishes
Fix cleaning problems step by step.
