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Bosch dryer not drying: what to check first

Your Bosch dryer may run a full cycle, count down like normal, then leave towels damp or cold. This page walks through the checks that usually matter on Bosch compact, condenser, and heat pump dryers. Start with airflow.

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Straight answer

A Bosch dryer not drying usually means air is restricted, the program is not matching the load, moisture is not being sensed correctly, or water is not being moved out of the machine. A common cause is lint or residue in the lint filter, condenser or heat exchanger area, moisture sensor area, or drain path.

Check these first

Safe to do yourself. Unplug the appliance before you start.

  1. Clean the door lint filter fully

    Pull the lint filter from the door opening, open it, and clear lint from both sides. If the mesh looks clean but feels waxy, rinse it and let it dry before the next load because softener film can choke airflow.

  2. Check the lower filter or heat exchanger

    Open the lower front maintenance flap if your model has one. Some models have a removable condenser, condenser cap, or EasyClean filter there instead of a simple lower filter. Clean only the removable parts your manual shows, let them dry fully, and don't scrape the metal fins with anything hard.

  3. Wipe the moisture sensor bars

    Look near the lint filter or inside the drum rim for two metal sensor strips. Wipe them with a damp cloth and a little white vinegar to remove detergent film or limescale. This helps when sensor cycles end early with clothes still damp.

  4. Empty the water container and check the drain hose

    Empty the tank. If your model has a filter in the condensation container, rinse that filter and push the tank fully back in. If the dryer drains to a standpipe or sink drain, check that the hose is not kinked and that the drain point is open.

  5. Use the right dryness setting

    Heat pump Bosch dryers run cooler than old vented dryers, so warm air and long cycles can be normal. For towels or heavy cotton, use a drier program such as extra dry if your panel offers it.

  6. Check the outside vent on vented models

    If your Bosch dryer vents outdoors, go outside while it runs and feel for steady warm airflow. A blocked wall cap or long lint-packed duct can leave clothes wet and can also trip a thermal fuse.

Side view of a dryer venting through a transition hose and wall duct to an outside flapLint screenTransition hose: crush pointWallOutside flap
Air leaves through the lint screen, the transition hose and the wall duct to the outside flap. A crushed hose or packed duct causes most heat and long-dry problems.
When it's a repair

A technician usually starts with a deep airflow clean-out, then tests before replacing parts such as damaged filters, clogged duct or condenser parts, a condensate pump or water-level sensor, moisture sensor bars or an NTC temperature sensor, a thermal fuse, high-limit device, or heating element on resistance-heat models, then the main control board if inputs and loads test correctly. On heat pump Bosch dryers, compressor or refrigerant work should be confirmed only after airflow, condenser care, water removal, and sensors are ruled out.

Models where this shows up most

Recent Bosch compact dryers are often ventless: many 300 Series machines are condensation dryers, while many 500 and 800 Series machines are heat pump dryers. Some self-cleaning heat pump models don't have a lower filter to clean. WTW, WQB, WQG, and WQH prefixes are commonly seen on heat pump units, but check the full E-Nr and manual.

Error code lists

Every Bosch dryer error code in one table, with what each means and what to check first →

Have the model number ready

The company will ask for it first. It's on a sticker or metal plate, usually in one of these spots:

Where the model tag usually is on a dryer12
  1. Inside the door opening, on the frame
  2. Some models: on the back panel
Worth knowing

Conditions that make this more likely

Lint and dust build up faster than you'd think

Dryer vents, refrigerator condenser coils and dishwasher filters collect lint, pet hair and dust. Homes with pets, long vent runs or dusty surroundings usually need these cleaned more than once a year.

The house drain can be the real problem

Older homes often have narrow or partly blocked standpipes and drain lines. If the machine's own filter and hose are clear, the house drain is the next suspect, and that's a plumbing call rather than an appliance call.

Hard water makes this more likely

Water above about 7 grains per gallon counts as hard, and USGS maps put much of the Southwest, Texas, the Great Plains and the Midwest above that. Scale builds up on inlet screens, valves, heating elements and spray arms years sooner than the manuals assume. If you're on hard water and this fault points to a fill or heating part, mineral buildup is the first thing a technician will look for.

What a technician tests

Most likely part first. These are for a technician with a meter and the tech sheet, not a weekend project.

PartHow it's tested
Airflow path, lower filter, and heat exchangerOn models with a user-access lower filter, EasyClean filter, or removable condenser, inspect that area with a light. A gray lint blanket on the fins, a glazed filter screen, crushed fins, or lint packed in the sump area points to restricted airflow. On self-cleaning heat pump models, also check lint screens, tank filter, air inlet, and service routines before blaming the sealed system.
Condensate pump and water-level switch or sensorCheck the tank or drain warning, sump, tank channel, and drain hose path. A pump that hums but moves no water, a silent pump when it should run, or a water-level switch or sensor stuck in lint sludge can stop drying or show a tank or drain warning when the tank is empty.
Moisture sensor bars and sensor circuitInspect the sensor bars for film, then compare timed dry with an automatic sensor cycle. If timed dry continues heating but the sensor cycle jumps down or stops early, the bars, wiring, or sensor input need testing.
NTC temperature sensorIsolate the sensor and meter it while changing its temperature. A good NTC changes smoothly as it warms or cools; an open, shorted, or fixed reading tells the control the wrong drum or air temperature.
Heating system or heat pump circuitOn electric heater models, test the thermal fuse and heating element for continuity; no continuity on either part is a failed part, and a blown fuse points back to an airflow restriction. On heat pump models, confirm the compressor starts, listen for a steady fridge-like hum, and suspect a sealed-system fault if airflow is clean but the air stays cold well into the cycle.

Don't see your symptom?

Describe it on the phone. The company on the other end works on these every day and will know what to ask.

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Common questions about appliance repair

Will resetting a Bosch dryer fix a not-drying problem?

Unplugging the dryer for a few minutes can clear a one-time control glitch. If the same drying problem comes back, the machine is reacting to lint, water removal, a sensor fault, or a failed heat part.

Why does my Bosch heat pump dryer feel barely warm?

That can be normal. Heat pump dryers use lower air temperatures and longer cycles, so judge the dryer by whether the load is dry at the end, not by how hot the air feels when you open the door.

Why does my Bosch dryer stop after a few minutes with wet clothes?

That often points to the moisture sensor bars or a sensor cycle setting. Clean the metal bars first, then try timed dry; if timed dry behaves differently, a technician should test the sensor circuit.

Should I call for service if my Bosch dryer is under warranty?

Yes, if basic cleaning and program settings don't solve it. Avoid opening the cabinet on a covered machine because Bosch recommends authorized service for repairs and internal work can create warranty trouble.

Is a Bosch dryer with a bad compressor worth fixing?

It depends on the dryer's age and condition. Have a technician confirm it first, because clogged condenser fins, a bad pump, or an NTC fault can look like a sealed-system failure from the outside.

Still showing the problem after the checks?

Call and describe what you tried. You'll be connected with an independent repair company near you.

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