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Bosch Dryer steam function not working

If your Bosch dryer’s steam function is not working, the most likely cause is a failed control board or main control board that is not sending power to the steam components. Start by visually inspecting the board for burned spots or shorted components since the electronic controls are hard to bench test. Next most likely is a bad steam generator: if the generator has power but nothing is being delivered to the drum, the generator may have failed. After that check the basics: make sure the water supply hose is actually connected to the dryer and the shared Y fitting, since no water means no steam. Inspect the steam nozzle inside the drum for clogs or damage that would block mist, and finally test the water inlet valve with a multimeter for continuity if you see no mist when the valve is energized. These steps cover the common causes when your dryer steam is not working or the steam fresh/sanitize options fail. Enter your model number on RepairClinic.com to find the exact replacement control board, generator, inlet valve, or nozzle that fits your dryer.

01 - Bosch Dryer Control Board

If no power is getting to either the dryer's water inlet valve during the steam cycle or the steam generator, then it's likely the dryer's control board is defective and the cause of the steam function problem. The control board cannot be easily tested, but you can try to inspect it for signs of burning or a shorted-out component to help determine if the part should be replaced.
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Common

02 - Bosch Dryer Main Control Board

If no power is getting to either the dryer's water inlet valve during the steam cycle or the steam generator, then it's likely the dryer's main control board is defective and the cause of the steam function problem. The control board cannot be easily tested, but you can try to inspect it for signs of burning or a shorted-out component to help determine if the part should be replaced.
Common

03 - Bosch Dryer Steam Generator

If no power is getting to the dryer's water inlet valve during the steam cycle, but power is reaching the steam generator, then it's likely the steam generator is defective and will need to be replaced.
Common

04 - Water supply not connected.

The water supply hose needs to be connected from the home's water supply to the water inlet valve on the dryer. The water line is usually connected to a “Y” connector and shares the same cold-water supply as the washer. Refer to the owner's manual for water hookup instructions.
Common

05 - Bosch Dryer Nozzle

The nozzle, normally located at the rear interior of the dryer, may be damaged or clogged with debris and unable to allow the steam to enter the drum area. Inspect the nozzle or any damage or obstruction and replace if necessary.
Less Common

06 - Bosch Dryer Water Inlet Valve

The dryer's water inlet valve provides the water necessary for the steam function to work. If there is no mist coming from the nozzle when the valve is energized, it's likely the inlet valve is defective. You can use a multimeter to test the valve for electrical continuity. If the valve tests negative for continuity, you'll know the part has failed and will need to be replaced.
Less Common

Frequently Asked Questions

Why is my dryer steam function not working?
Can a bad control board stop the steam cycle?
How do I test the dryer water inlet valve?
No mist coming from the nozzle — what should I check?
How do I enter my model or part number on RepairClinic.com to find the right replacement part?