Blomberg Heat Pump Dryer Not Drying? Clean These 4 Things First
A Blomberg ventless heat pump dryer (DHP24400W, DHP24412W, DHP24404W and similar) dries more gently and uses less energy than a vented dryer, but it depends completely on airflow through a closed loop. When that loop clogs with lint, drying times grow longer every week until clothes come out damp. Here’s what to clean, in the order Blomberg’s own manual lists it.
1. Lint filter (every load)
Pull the lint filter up out of the door opening and remove the lint by hand. Blomberg also recommends washing the filter in warm water when a thin film builds up on the mesh, which you often can’t see. Let it dry completely before putting it back. Wipe the inner surface of the door and the door gasket with a damp cloth too.
2. Filter drawer: sponge and cloth (every few loads)
Behind the kick plate at the bottom front is a filter drawer with a sponge and a filter cloth. Press the kick plate button to open it. The dryer reminds you with a flashing light at most every 3 cycles. Rinse the sponge and the cloth by hand to remove lint and let the sponge dry well. A clogged sponge is the number one cause of slow drying we see.
3. Evaporator fins (behind the filter drawer)
With the drawer out, look at the metal fins behind it. If they’re grey with lint, vacuum them gently. Blomberg warns not to touch them with bare hands because the fins are sharp. Don’t bend them.
4. Moisture sensor (about 4 times a year)
Inside the drum are two metal bars that sense when clothes are dry. Fabric softener and minerals coat them over time, which can end cycles early or run them too long. Wipe them with a cloth dampened with vinegar, then dry. Don’t use metal tools.
Other things that slow drying
- Overloading. Blomberg lists 18 lbs for Cotton, but only 4 lbs for Synthetics and Delicates.
- Poor spin in the washer. Wetter clothes take much longer to dry.
- Room too cold or too hot. Blomberg rates these dryers for +5°C to +35°C. An unheated garage in January is below that.
- Closet with no ventilation openings. A heat pump dryer in a closed closet needs the openings described in the installation manual, or the room overheats.
When it’s a repair
If everything is clean and drying is still poor, the problem is usually inside: lint packed deep in the evaporator or condenser, a weak fan, a faulty sensor, or a problem with the heat pump system itself. These need a technician. Our technician is ODP-certified for refrigerant handling, so we can check the heat pump properly.
What a service visit involves
- Check the air path end to end: lint filter, filter drawer, evaporator and condenser. Lint packed deep in the heat exchanger is common on dryers that went a long time without drawer cleaning.
- Check the fans. A weak or noisy fan moves less air and drying slows down.
- Test the sensors. Faulty moisture or temperature sensors can end cycles too early or run them far too long.
- Check the heat pump. If airflow is good and the dryer still doesn’t get warm enough, we check the compressor and refrigerant side.
Normal vs. a real problem
Heat pump dryers dry at lower temperatures than vented dryers, so cycles take longer. That’s normal. Signs of a real problem are cycles that keep getting longer week by week, clothes that come out damp on a normal load, a dryer that feels cold inside mid-cycle, or new noises.
Repair or replace?
Cleaning the heat exchanger, replacing a fan or a sensor are usually well worth it. A failed compressor or sealed system is a bigger repair, and on an older dryer we’ll tell you honestly if replacement makes more sense.
Frequently asked questions
How long should a load take?
It depends on the load and program, but heat pump dryers typically take noticeably longer than vented dryers. Compare with how long the same load took when the dryer was new.
Can I clean the evaporator myself?
You can vacuum the visible fins gently. Lint packed deeper inside needs the dryer opened up, which is a technician’s job.
Why do my clothes come out damp but the cycle ends early?
Usually the moisture sensor bars are coated. Clean them with a vinegar-dampened cloth. If that doesn’t help, the sensor or control needs testing.
Call 604-729-0499 or leave a request online. See also: Blomberg dryer repair.
