Thermador Dishwasher E25 Error: Drain Pump Impeller Blocked
Thermador dishwasher E25 error indicates drain pump impeller blocked. Review the diagnostic steps below before calling a technician for help. What Does Thermador Dishwasher Error Code E25 Mean? The E25 error code on a Thermador Sapphire, Star-Sapphire, or Emerald dishwasher indicates the drain pump impeller is blocked or the pump cover is loose. It is […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Do not run cycles with standing water in the tub. Resolving E25 requires checking the pump cover and clearing any impeller obstruction before the next cycle.
Can I reset the code?
Yes. After removing the obstruction or seating the pump cover, reset the dishwasher and run a short drain cycle to verify. E25 should clear if the physical cause has been resolved.
When to stop immediately?
Stop if you notice: Pump cover is seated but E25 returns on every drain cycle, Scraping sound continues even after debris removal.
Symptoms You May Notice
Dishwasher does not drain and water remains in the tub
Water sits at the bottom of the tub after the cycle completes, at a level suggesting no draining occurred at all.
Rattling or scraping sound from the base during drain phases
An unusual mechanical noise from the bottom of the dishwasher during drain attempts, distinct from normal pump hum.
E25 follows a cycle where broken glass or hard debris was washed
The error appeared after a load containing a broken item, a toothpick, or other small hard object that slipped through the filter.
Possible Causes
Hard object lodged in the pump impeller
A glass shard, toothpick, piece of bone, or twist tie has wedged between the impeller blades and the pump housing, preventing rotation.
DIY PossibleDrain pump cover not properly seated
The drain pump cover was not clicked into the locked position after a previous filter cleaning, causing it to rattle loose and restrict impeller movement.
DIY PossibleKinked drain hose creating backpressure jam
Extreme backpressure from a kinked drain hose forces water back against the impeller and can simulate a physical jam.
DIY PossibleSafe Checks You Can Do
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1
Remove the filter and inspect the pump cover
Remove the bottom rack and filter assembly. Look for the drain pump cover — a round or oval cap directly below the filter housing. Press firmly on it to confirm it is seated and locked. If it moves or rattles, push it firmly until it clicks into position.
An unlocked pump cover is responsible for a significant number of Thermador E25 codes. Always check the cover first — this takes under one minute.
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2
Check for debris around the pump impeller
With the pump cover removed (if your model allows it), use a flashlight to inspect the impeller area for visible obstructions. Use tongs or tweezers to remove any glass, bone, or other debris.
Even a single toothpick wedged between impeller blades can completely stop the pump and trigger E25. Remove it and run a drain cycle to confirm clearing.
When to Call a Professional
Contact a qualified technician if:
- Impeller visible but will not turn freely even after removing all debris
- Pump cover cannot be seated correctly due to damage
- E25 returns immediately after clearing and confirming no visible obstruction
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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