The short answer: Bosch dishwashers flag faults with an E code, and the number tells you which system to look at. Drain and filter codes such as E24 and E22 often clear with an owner check, while a heating code like E09 or a repeat E15 anti-flood trip names hardware that needs a technician. Bosch wall ovens use their own fault codes for temperature sensors and heating too. Here is how to read the family and decide whether to book service on North Fulton.
Bosch Lines and Models
Bosch is best known in Johns Creek kitchens for its exceptionally quiet dishwashers, and the range runs from the 100 and 300 Series up through the 500 Series to the flagship 800 Series and Benchmark lines. The upper models add features owners notice: CrystalDry that turns residual moisture into real drying performance, a flexible third rack for utensils, and the PrecisionWash sensing that adjusts the cycle to the load. Beyond dishwashers, Bosch builds single and double built-in wall ovens and a range of cooktops. Whatever the model, the diagnostic logic is consistent, so the first step on any call is reading the code and confirming the symptom before touching a part.
Common Bosch E-Codes
Bosch groups its dishwasher faults into an E-code family. The four you are most likely to see fall into the water, drain, and heating circuits. Write down the exact code before you do anything, because it points a technician straight at the right part.
| Code | System | What It Means | Owner Check |
|---|---|---|---|
| E15 | Anti-flood | Water in the base tray floats the anti-flood switch, so the machine halts to prevent a leak | Unplug, tip standing water out of the base, let it dry, then restart |
| E24 | Drain | Water is not draining, usually a clogged filter, kinked hose, or blocked disposal knockout | Clean the filter, straighten the hose, clear the knockout, run a cycle |
| E22 | Filter / drainage | A dirty filter or a restricted drainage path is holding water in the tub | Pull and rinse the filter basket, confirm the sump is clear |
| E09 | Heating element | The heater that warms wash and dry water has failed or lost its control circuit | None; the element is sealed and needs a technician to test and replace |
E15 and E24 are the two codes we get asked about most, and they each deserve their own walkthrough. Our dishwasher service page carries the deep dive on both, with the full step-by-step for tipping out the tray on an E15 and clearing every drain point on an E24. Use this guide for the wider picture and that page when you want to work one of those two codes end to end.
An E15 fires because water reached the base tray, so treat it as a small leak that has already started. Unplug the dishwasher before you reach into the base, and mop up any water on the floor so it does not reach the cabinet or subfloor. If E15 comes back after you dry the tray and restart, stop running the machine. A repeating trip means water is still finding the base from a hose, seal, or pump, and continuing to run it only feeds the leak. Book a technician before the next cycle.
Bosch Wall Ovens and Cooktops
Bosch wall ovens use fault codes as well, and the failures we see most are temperature and heating faults rather than drain issues. A drifted oven temperature sensor is the classic cause of an oven that bakes hot or cold, or that throws a code and refuses to heat. Bake and broil elements fail over time, and the control board that switches them can develop a relay fault. Because a wall oven runs on a dedicated high-amp circuit, an oven that is completely dead is worth confirming at the breaker first, but a code on the display points at the appliance rather than the panel. We measure the sensor, test the elements, and check the control before condemning any one part, and we match the replacement to your exact model number.
Maintenance That Prevents Bosch Faults
Most drain and filter codes are avoidable with a little routine care, and Bosch makes the steps simple. Pull the filter basket at the bottom of the tub every few weeks, rinse it under the tap, and clear any food or glass caught in the sump; a clean filter is the single best defense against E22 and E24. Keep the rinse-aid reservoir topped up, since it drives the drying performance that owners expect from an 800 Series or Benchmark and stops spotting on glassware. If your Johns Creek home runs on hard water, keep the water-softener salt reservoir filled on models that have one, which protects the heater and the internal plumbing from scale. None of this needs a technician, and it keeps the machine quiet and efficient between service calls.
When to Book
A single stray code is worth one reset, and the owner checks in the table above are reasonable first steps for E24 and E22. Book a technician when a code returns after a reset, when E15 trips more than once, when dishes come out wet and cold on an E09, or when a wall oven bakes off temperature or will not heat. The heating element, the anti-flood system, and oven sensors and boards all need proper testing rather than guesswork. We fit model-specific Bosch Genuine OEM Parts selected to your model, and every repair we complete in Johns Creek carries our Completed repairs include a 180-day repair warranty. Written terms are provided with the repair. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.