Brand: SIEMENS
Category: Tumble Dryer
Document Type: Manual
Language: EN
Manual for WT4HY790GB
Uploaded: Nov. 21, 2025, 8:30 p.m.
Your new tumble dryer
Please take a few minutes to read and become familiar with the advantages of your tumble dryer.
To meet the high quality demands required by Siemens, every tumble dryer that leaves our factory is carefully checked to ensure that it functions correctly and is in perfect condition.
For more information on our products, accessories, replacement parts and services, see our website www.siemens-home.com or contact our Customer Service centres.
If the operating and installation instructions describe different models, any differences will be pointed out at the relevant points in the text.
Read these operating and installation instructions before operating the tumble dryer.
Display rules
Warning!
This combination of symbol and signal word indicates a possibly dangerous situation. Not heeding the warning can cause death or injuries.
Caution!
This signal word indicates a possibly dangerous situation. Not heeding the caution can cause property and/or environmental damage.
Note/tip
Information about the optimum use of the appliance/any other useful information.
1. 2. 3. / a) b) c)
The steps are represented by numbers or letters.
- / -
Lists are represented by a small box or a dash.
Troubleshooting and error codes
| Faults | Cause/remedy |
|---|---|
| Please empty condensate container on the display panel and drying has stopped. | Empty the condensation container; → Page 19 and the dryer; . If the optional condensation drain* has been installed, the drain hose may be blocked or kinked. Check the hose for deposits and flush the hose through. Lay the hose without any kinks. |
| Please clean lint filter on the display panel. | Clean the fluff filter and press the Start button → Page 32. |
| Heat exchanger is being rinsed on the display panel. | Not a fault. The heat exchanger is cleaned automatically. Do not pull out the condensation container while this is displayed. |
| Dryer will not start. | Mains plug plugged in or fuse/circuit breaker checked? Programme selected?Select a programme. Dryer door open? Close the door. Is the childproof lock activated? Deactivate childproof lock. "Ready in" time selected? Programme starts after a delay → Page 26. |
| on the display panel. | Wi-Fi is switched on but a connection to your home network cannot be established. Check whether your home network is available or try to connect to your home network again. |
| Home Connect is not working. | You can find solutions to problems with Home Connect at www.home-connect.com. The availability of the Home Connect functionality depends on the availability of the Home Connect Services in your country. Home Connect Services are not available in every country – for further information please check: www.home-connect.com. |
| Creasing. | Creasing occurs when you have exceeded the maximum load or selected the wrong programme for the type of fabric. All the required information can be found in the programme table → Page 25. Remove clothes immediately after drying; creasing will occur if they are left in the drum. |
| Water is leaking out. | Not a fault; the dryer may be positioned on an incline. Level the dryer. |
| Programme duration displayed changes during drying. | Not a fault. The moisture sensors detect the remaining moisture in the load and adjust the programme length accordingly (except timed programmes). |
| Laundry is not dried properly or is still too damp. | After the programme has ended, warm laundry feels damper than it actu- ally is.Spread the laundry out and allow the heat to disperse. Fine tune the dryness level – this extends the drying time but does not increase the temperature. Your laundry will become drier → Page 26. Select a programme with a longer drying time or increase the dryness level. This does not increase the temperature. Select a timed programme to add extra drying time for laundry that is still damp → Page 25. If you have exceeded the maximum load for the programme, the laundry may not be dried properly. Clean the moisture sensor in the drum. The sensor may become covered in a fine layer of limescale or detergent and care product residue, which then impairs its performance. This prevents your laundry from being dried prop- erly → Page 41. Drying has stopped as a result of a power cut, because the condensation container is full or because the maximum drying time has been exceeded. Note: See also the laundry tips → Page 24. |
| Drying time too long? | The fluff filter may be clogged, which will make the drying time longer.Clean the fluff filter. If the air inlet on the dryer is blocked or not freely accessible, this may increase the drying time. Make sure that the air inlet remains unobstructed. The optimum ambient temperature for drying is between 15 °C and 30 °C.Outside of this range, the drying time may increase. Insufficient air circulation in the room may increase the drying time. Venti- late the room. |
| Display panel goes out and Start button flashes. | Not a fault. Energy-saving mode is active → Page 12. |
| Residual water in the condensation container despite the dryer being connected to the condensation drain*. | Not a fault. If the condensation drain is installed, residual water remains in the condensation container due to the dryer's self-cleaning function. |
| Humidity in the room is increasing. | Not a fault. Make sure the room is adequately ventilated. |
| Power cut. | The drying programme is stopped. Remove the laundry and spread it out or restart the programme. |
| Unusual noises when drying. | Not a fault. Noises are produced by the automatic cleaning of the heat exchanger → Page 40. |
| The dryer feels cold despite drying. | Not a fault. The dryer can dry effectively at low temperatures using a heat pump. |