The short answer: an E24 on a Bosch dishwasher is a drainage fault, meaning water did not leave the machine in time. It is almost always a clogged filter, a blocked or kinked drain hose, a stuck check valve, or a tired drain pump, not a failed dishwasher.
Bosch monitors how fast water drains, and when it is too slow it posts E24 and holds the cycle. It is closely related to the E22 filter code and is among the most common Bosch faults we clear across Longmont. The fix is in the drain path.
What Causes an E24
| Symptom | Likely Cause | Our Fix |
|---|---|---|
| Standing water in the tub | Clogged filter or debris | Clean the filter and sump, clear debris |
| Slow or no drain | Kinked or blocked drain hose | Clear the hose, confirm the high loop |
| Drains partway | Stuck check valve | Clean or replace the check valve |
| Pump hums, no flow | Jammed or worn drain pump | Clear the impeller or replace the pump |
| E24 at the disposer | Blocked disposer knockout | Clear the disposer connection |
Working the Drain Path
A technician starts at the filter and sump, then follows the drain hose for kinks and blockages, confirms the high loop, and checks the check valve that keeps water from siphoning back. If the path is clear but the pump only hums, the impeller may be jammed with glass or debris, or the pump may be worn. Each is a defined repair.
What the Repair Involves
The filter and sump are cleaned, the hose and check valve are cleared, and the drain pump is tested for flow. A jammed or failed pump is replaced with a a part selected for the approved scope, and the machine is run through a drain cycle to confirm E24 does not return.
Bosch Showing E24?
We clear the drain path and repair with genuine OEM parts. Book online or call. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.
Start with the Filter Before Anything Else
If your Bosch throws an E24, spend two minutes on the filter before you spend anything else. It sits at the bottom of the tub, twists out by hand, and needs no tools at all. Pull it, look at it, rinse it under the tap, and put it back. A genuinely surprising share of the E24 calls we are booked for in Longmont kitchens would have been solved right there, and the reason is simple: nobody told the owner the filter existed. It is not mentioned at handover, the manual goes in a drawer, and the machine quietly silts up over several years of hard Douglas County water until the drain path cannot move what it needs to.
If the filter was clean, or cleaning it did not clear the code, the next candidates in order are the drain hose, the air gap if your installation has one, and then the pump itself. Working through them in that sequence matters, because the pump is the expensive one and it is the least likely of the three to be at fault. A pump that is straining against a blockage sounds exactly like a pump that is dying, and replacing it while the restriction is still there just puts a new part under the same load.
Related Reading
E15 Error
The leak-protection code explained.
Bosch Repair Guide
The full owner's guide to Bosch.
Dishwasher Repair
Our dishwasher service.