Thermador Dishwasher E23 Error: Drain Pump Fault
Thermador dishwasher E23 error indicates drain pump fault. Review the diagnostic steps below before calling a technician for help. What Does Thermador Dishwasher Error Code E23 Mean? The E23 error code on a Thermador Sapphire, Star-Sapphire, or Emerald dishwasher indicates a drain pump malfunction. The drain pump is responsible for removing dirty wash and rinse […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. A drain pump fault leaves standing water in the tub between cycles. This creates sanitation concerns and can lead to odor buildup. Do not run cycles with standing water present until the drain is restored.
Can I reset the code?
Yes. A power reset can clear E23 if the drain pump was stopped by a momentary obstruction. After the reset, run a short cycle to verify draining. If E23 returns, the pump motor has failed or a hard obstruction is present.
When to stop immediately?
Stop if you notice: Standing water in tub after reset and test cycle, Burning smell from the drain pump area at the base.
Symptoms You May Notice
Standing water remains in the tub at the end of the cycle
After the cycle ends, several inches of dirty water are still present at the bottom of the dishwasher tub.
Cycle stops mid-program during a drain phase
The program halts partway through, typically at a point when drain pump activation is expected between wash and rinse phases.
Gurgling or grinding noise from the base of the dishwasher
An unusual sound comes from the pump area as the drain pump struggles to move water or operates against an obstruction.
Possible Causes
Drain pump impeller jammed with debris
The impeller wheel inside the drain pump has been stopped by a glass shard, bone fragment, or other hard debris that passed through the filter.
DIY PossibleFailed drain pump motor
The electric motor inside the drain pump has burned out or seized after years of continuous operation.
Requires ProfessionalKinked or blocked drain hose
The hose that carries drain water from the pump to the household drain has developed a kink, a blockage from debris buildup, or a partial blockage where it connects to the garbage disposal or standpipe.
DIY PossibleSafe Checks You Can Do
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1
Reset the unit and check the drain hose
Switch the circuit breaker off for 60 seconds. While the power is off, check the drain hose at the back of the dishwasher for kinks. If connected to a garbage disposal, verify the disposal knockout plug has been removed. Restore power and try a drain-only cycle.
Thermador Star-Sapphire dishwashers have a drain cycle accessible from the control panel. Starting a standalone drain cycle can clear a minor impeller jam.
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2
Clean the filter and inspect the pump area
Remove the lower rack, remove and clean the filter assembly, and use a flashlight to look for visible debris in the pump area beneath the filter housing.
Hard debris like glass or bone that reaches the drain pump often shows as a grinding sound. If you can see the obstruction from above, carefully remove it with tongs before reconnecting power.
When to Call a Professional
Contact a qualified technician if:
- Drain pump motor draws current but impeller does not spin
- Obstruction confirmed inside pump impeller housing that cannot be reached from above
- E23 persists after drain hose inspection and filter cleaning
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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