Bosch dryer error codes: most of them are the fluff filter, the water container, or the heat exchanger.

Not a fault. The container that collects the water pulled from the clothes is full and the dryer stops until it is emptied — about every load on a condensation model, less often on a heat-pump model.

1. Pull the container out by its handle (top left of the front), pour it out, slide it back until it seats — the message clears when it clicks home.
2. A container that fills every load on a dryer plumbed to a drain: the drain hose is kinked, lifted above the dryer, or pushed too far into the standpipe so it cannot run off.
3. A container that never fills and clothes come out damp: the dryer is not condensing — see Clean heat exchanger below.

Empty it and press Start to carry on; a cycle interrupted by a full container finishes where it left off. The drain hose kit from Bosch takes the container out of the routine for good — the hose end goes into the standpipe or a sink tailpiece, never below the floor.

Not a fault. The two-part fluff filter in the door opening has lint on it — the dryer prints this after every cycle on most models, and stops early with damp clothes when the filter is actually blocked.

1. Open the door, lift the filter out of the opening by its handle, fold the two halves apart and strip the lint from both screens.
2. Rinse it under warm water when the lint will not strip clean, dry it, and fold it back together before it goes in.
3. A 300 series dryer also has a fine filter behind the base flap — see Clean heat exchanger below; a heat-pump model has a second filter in the heat exchanger door at the bottom left, cleaned every few cycles.

A clean filter clears the message on the next start. Lint left on the screens is the one thing that makes a compact dryer run long and leave clothes damp.

Not a fault. On a condensation dryer the heat exchanger (the finned block behind the flap at the bottom left of the front) has fluff packed in its fins and cannot condense — clothes come out damp and the cycle runs long. A heat-pump model cleans its own exchanger and prints a filter reminder instead.

1. Open the flap at the bottom left, turn the locking levers and pull the heat exchanger out by its handle; a little water comes with it, so a towel first.
2. Hold it under the shower or a tap and wash the fluff out of the fins from the back side; the fins bend, so no brush.
3. Let it drain, slide it back in until it stops, lock the levers and close the flap — levers left open print the message again.

A clean exchanger clears the message and brings the drying time back. Every month in normal use; a dryer that still dries slowly with a clean exchanger and a clean filter has a fan or a pump fault — a technician's look.

Not a fault. The dryer will not start, or stopped, because the door switch does not report closed.

1. Push the door shut until it clicks; a sock caught in the opening, or the fluff filter not seated flat, keeps it from latching.
2. A door that clicks and still shows the message after a power cut is the door switch — a part.

Close the door and press Start — the cycle picks up where it stopped. A switch that does not report is replaced from inside the door frame, a technician's job.

Not a fault. The panel is locked so a child cannot change the program — the key symbol shows in the display and the keys do nothing.

1. Press and hold the key the panel marks with the key symbol (Start/Pause on most models, or the two keys printed with it) for about five seconds until the symbol goes out.

The lock turns off and the panel answers again.