Bosch Heat Pump Dryer Not Collecting Water (Try this first!)

Bosch heat pump dryers are one of the most popular choices for energy-efficient clothes drying. Unlike conventional dryers, they do not vent the moist air outside but instead collect the water in a tank that you can empty quickly. This way, you can save energy and reduce your environmental impact.

However, sometimes you may notice that your Bosch heat pump dryer is not collecting water as it should. This can affect the performance and quality of your drying cycle and even damage your dryer in the long run. Therefore, it is important to identify and fix the problem as soon as possible. 

Here are some common causes behind a Bosch heat pump dryer failing to collect water and solutions to resolve them.

Cause 1: A full Condensation tank

One of the most prevalent reasons a Bosch heat pump dryer may fail to collect water is a full condensation tank. 

The condensation tank collects all the moisture absorbed during drying. However, if the tank is not emptied regularly, it can become full and prevent further water collection.


The solution is to empty the condensation tank.

To do this, follow these steps:

Pro Tip: Bosch recommends emptying the condensation tank after each use. 

Cause 2: Clogged lint filter

The lint filter is one of the essential components of your Bosch heat pump dryer that needs regular cleaning. 

The lint filter is located inside the door of the dryer, and it traps the lint and fluff from your clothes. 

If you don’t clean the lint filter regularly, it can become clogged with lint and dust, which can cause water collection issues.


The solution is to inspect and clean the lint filter. 

To inspect and clean the lint filter, follow these steps:

  1. Open the dryer’s door and pull out the lint filter from the slot.
  1. Open the lint filter and remove any lint or fluff from the surface. You can use your fingers, a soft brush, or a vacuum cleaner to do this.
  1. Close the lint filter and insert it back into the slot. Make sure it is aligned and pushed firmly until it clicks into place.

Pro Tip: You should clean the lint filter after each drying cycle, or at least once a week, to prevent it from getting clogged and affecting the airflow and the water collection.

Cause 3: Faulty condensate pump

A less common but more serious cause of water collection issues in Bosch heat pump dryers is a faulty or damaged water pump. The condensate pump is the part of the dryer that pumps the water from the condenser to the water tank. 

It is located behind the condenser unit, and it is activated by a sensor that detects the water level in the condenser.

 Without a functioning condensate pump, the water may not reach the tank, or it may leak or overflow inside the dryer. 


The solution to the faulty condensate pump is to replace it as soon as possible.

Besides, you also need to check the condensate pump wire for blockages. To do this:

  1. Remove the condenser unit from the bottom door.
  2. Find the condensate pump behind the condenser unit. It is a black box with a white tube.
  3. Check the white tube for any blockages, kinks, or twists. If you notice any blockages, use a wire or a needle to clear them. If you notice any kinks or twists, straighten them out.

Then, check the condensate pump for any visible signs of damage, such as cracks, leaks, or corrosion. And if you notice any damage, it means you need to change your condensate pump. 

However, don’t attempt to repair it yourself, but contact Bosch customer service or a qualified technician to inspect and replace it for you.

Additional considerations

1). Power Issues with the Dryer

Besides the common mechanical problems mentioned above, an electrical issue could be preventing the dryer from functioning properly. 

The dryer may not be receiving power if it is not securely plugged into a working electrical outlet. Ensure the plug is fully inserted into the wall, and check the circuit breaker box for any tripped switches.

It is also important to confirm the dryer is connected to a power source that matches its voltage requirements. Most dryers operate on 240V power and will not work with a standard 120V household outlet. The electrical cord and outlet must be compatible to avoid power failures.

2). Ensure Proper Installation and Ventilation

Another factor to evaluate is how the dryer was installed and whether it has sufficient ventilation. 

For optimal performance, the dryer should be placed on a stable, level surface away from possible obstructions.

Improper installation in a tight space could restrict airflow and cause the dryer to shut off as a safety precaution. Vent ductwork should also be free of lint buildup. Checking these installation requirements can help rule out any issues related to ventilation or ventilation safety features.

Still, having trouble?

Most problems can be fixed by cleaning, clearing a blockage, or adjusting some settings. 

However, you might need to change a part every now and then to keep running your dryer optimally, and that’s worth it, given the benefits of a dryer!

To find out more, you can contact us. We can do some basic tests to see if the problem with the dryer can be solved over the phone, and if not, we can help you arrange for a manufacturer engineer, if available, to check it out.