Bosch 300 Series Dryer DR Code

Most dryers utilize ductwork and vents to release moisture and lint during drying cycles. However, there are some models that dry clothes using other moisture-releasing technology, so they have different internal components. Problems with these dryers may manifest in other ways.

A DR error code on a Bosch 300 Series dryer shows an issue with the condensation drying function caused by buildup in the lint trap or condenser filter, a kinked drain hose, or a faulty drain pump. Clean the trap and filter, and adjust the hose. 

Bosch dryer

If doing the above doesn’t help, the drain pump may need replacing. This article explores what the DR code on a Bosch 300 Series dryer means and what you can do to remedy the problem. 

Bosch Dryer DR Code

The Bosch 300 Series Dryer is a compact condensation dryer. These dryers are unique, as they don’t require an exhaust vent to function. Instead, they utilize condensation drying, where moisture is released through a drain pump instead of a ventilation system seen in standard dryers.

They’re an excellent choice for small spaces or homes without access to an outdoor exhaust vent. 

Bosch dryer DR code

However, they experience frequent issues with the draining function, which often manifests as a DR error code on the Bosch 300 Series dryer. The Bosch 800 Series Dryer DR code means exactly the same thing, as both of these dryers use the same condensation drying function.

The Bosch dryer DR code means that moisture isn’t being adequately removed from the system, so the dryer isn’t operating effectively, which is usually a problem with the drain function. There might be other signs of a faulty drain pump, such as the dryer running hotter than usual or shutting off mid-cycle.

How To Fix a Bosch 300 Series DR Code

The Bosch 300 Series dryer has a small compartment beneath the drum that holds a drain pump and condenser cartridge. The pump removes water from the dryer, and the condenser cartridge collects the moisture

After repeated use, lint and other buildups may cause some of the internal components to stop working effectively. This can obstruct airflow or block sensors, preventing the dryer from properly functioning.

Below, we’ll cover four easy fixes to get the dryer up and running again. If these issues don’t remedy the problem, you may need to replace the drain pump entirely.

Clean the Lint Trap On the Bosch 300 Series

This is the easiest potential fix to get your Bosch 300 Series dryer working again if you suspect lint buildup is causing the DR error code. However, you must usually combine this fix with others, or clean the condenser cartridge, to get the dryer working optimally again.

Here’s how to clean the lint trap:

  1. Open the dryer door.
  2. Locate the lint compartment at the bottom of the door cavity.
  3. Pull out the lint trap.
  4. Open the lint trap over a trash bin to prevent debris from falling on the floor.
  5. Run your hand over the filter to remove any lint.
  6. Discard the lint.
  7. Close the filter by folding it.
  8. Slide the lint trap back into the cavity.
  9. Close the dryer door.

You should clean your lint trap before and after every dryer cycle to prevent excessive buildup and fire hazards.

Clean the Condenser Cartridge On a Bosch 300 Series Dryer

The condenser cartridge may become clogged with wet lint and other debris over time. You should make it a point to check this cartridge at least once a month to prevent clogs.

To remove the condenser cartridge on a Bosch 300 Series dryer:

  1. Unplug the dryer to prevent electrical hazards.
  2. Locate the maintenance flap on the dryer below the door.
  3. Place a towel or absorbent cloth under the maintenance door to collect residual water.
  4. Unlock and open the maintenance flap by pressing down on the tab and pulling it open.
  5. Turn the two corner latches on the compartment, so they face inward.
  6. Pull out the condenser cap and set it aside.
  7. Reach in and remove the condenser cartridge.

To clean the condenser filter on a Bosch 300 Series dryer:

  1. Manually remove any lint by swiping your hand along the front and back of the filter.
  2. Place the filter under pressurized running water to flush out lint and debris.
  3. Turn the filter around and rinse out the opposite end and sides.
  4. Reach into the condenser cartridge cavity on the dryer to remove any lint buildup.
  5. Remove visible lint from around the dryer seals.

To replace the condenser cartridge on a Bosch 300 Series dryer:

  1. Reinsert the condenser filter back into the clean recessed cavity.
  2. Push the condenser cap back into place over the filter.
  3. Relatch the two corner locks so they’re facing away from one another.
  4. Close the maintenance flap until it clicks.
  5. Restore power to the dryer and test.

Clean the Moisture Sensors On a Bosch 300 Series Dryer

If cleaning the lint trap or condenser cartridge didn’t remedy the issue with your Bosch 300 Series dryer and DR error code, try cleaning the moisture sensors.

This particular dryer model comes equipped with moisture sensors that indicate dampness, and it lets the dryer know when the clothes are dry so it can shut off. Over time, these sensors become dirty with limescale and soap buildup. 

When they’re covered in this film, it can prevent them from working properly and reduce the efficiency of your dryer. Fortunately, they’re fairly easy to clean.

To clean the moisture sensors on a Bosch 300 Series dryer:

  1. Open the dryer door.
  2. Locate the dryer sensors (they look like two bars alongside the lint filter).
  3. Dip a wet cloth in distilled white vinegar and wring out the excess liquid.
  4. Wipe down the sensors using a damp cloth.
  5. Allow the sensors to dry before closing the dryer door.

To maintain optimal dryer function, clean the moisture sensors once a month.

Check the Drain Hose On a Bosch 300 Series Dryer

When a Bosch Dryer DR code appears on your display, and the above steps don’t resolve the issue, check the drain hose to ensure it’s straight and free of obstructions. The Bosch 800 Series dryer DR code also displays the same problem, so this should fix that model as well.

Check to ensure the drain hose is sitting inside of the dryer without kinks, twists, restrictions, gaps, or other blockages. Any of these problems will prevent water from successfully exiting the tube, allowing moisture to back up in the hose, which might cause the dryer to become excessively hot or lead it to shut off mid-cycle.

Contact Customer Service

When all else fails, contact Bosch customer service. It’s best to reach out to a technician than to attempt any repairs without expertise, as you may void your warranty or cause additional damage. In some cases, the drain pump may need replacing or cleaning. 

Customer service can advise you further on which steps to take.

Resetting the Bosch 300 Series Error Code

To remove the DR error code from a Bosch 300 Series or Bosch 800 Series Compact Condensation Dryer, just turn off the power to the dryer. Then, unplug the appliance from the wall. Wait for about five minutes before restoring power to the device. This completely removes power from the system and resets it to remove all error codes from the display.


The Bosch 300 Series Dryer utilizes innovative technology to dry clothes without requiring ductwork or ventilation. Although this is great for limited space, it means the dryer must release moisture in other ways. With this dryer model, a DR code may appear on the display, indicating problems with the condensation drying system. Fortunately, you may be able to fix it with a few simple steps.