E22: the Filter Fault
E22 appears when the filter or the area around it is restricted, so water cannot circulate or drain the way it should. It is one of the most owner-friendly Bosch codes because the fix is almost always cleaning. Twist out the cylindrical filter in the base of the tub, rinse it under the tap, clear the coarse screen underneath, and check that nothing, glass, labels, or food, is caught in the sump. Reseat the filter and run a cycle. In most cases E22 does not come back once the filter is clean.
E09: the Heating Fault
E09 points to the heating system, the flow-through heater that warms the wash water. When it fails, the water stays cool, so dishes come out poorly cleaned and wet because there is no heat to dry them. Unlike E22, this is not something to fix by cleaning; the heater and its wiring need to be tested, and a failed heater is replaced. Because it is integrated into the pump assembly on many Bosch models, this is a professional repair.
Why Filter Care Prevents More Than E22
A clean filter does more than clear E22. It also keeps the drain path open, which helps prevent drain codes, and it improves wash quality. In mountain second homes that sit idle between visits, running a rinse when you arrive and keeping the filter clear goes a long way.
Codes at a Glance
| Code | Meaning | Response |
|---|---|---|
| E22 | Clogged filter / restricted flow | Clean filter and sump; reseat |
| E09 | Heating element / flow heater fault | Professional diagnosis; replace heater |
| E22 recurring | Trapped debris or pump restriction | Inspect sump and pump |
| E09 with wet, cool dishes | No wash-water heat | Technician service |
Heating Fault or Stubborn Code?
Book a brand-focused diagnosis for your Bosch. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.
Frequently Asked Questions
What Does E22 Mean on a Bosch Dishwasher?
What Is a Bosch E09 Code?
Can a Dirty Filter Really Cause a Fault Code?
Related Reading
Bosch E15 and E24
Leak and drain faults.
Bosch Maintenance Guide
Prevent the common codes.
Bosch Repair
Models and problems we service.