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Bosch Dryer starts then stops

If your Bosch dryer starts then stops, or the dryer stops after a few seconds or runs briefly then stops, the most likely causes are the user control and display board or the timer. Intermittent start/cancel button behavior points strongly to the user control/display board, and a faulty timer can also cut cycles short. Less likely causes, in descending order, are a bad moisture sensor (rare), a failed motor relay, or problems with the control board or main control board. Before you replace parts, verify the door switch and front controls for intermittent contact, and perform simple checks: the timer and motor relay can be tested with a multimeter and the control boards inspected for burned or shorted components. If tests point to a part replacement, enter your model number at RepairClinic.com to find the exact replacement part that fits your dryer. Our repair guides will walk you through the testing and safe replacement steps so you can get the dryer running reliably again.

01 - Bosch Dryer Moisture Sensor

The moisture sensor monitors the clothing’s moisture level and sends a signal to the control board when the clothes are dry. If the moisture sensor is malfunctioning, it could inaccurately report that the clothing have sufficient dried, causing the drum to stop spinning. However, this is rarely the case. Before replacing the moisture sensor check all the more commonly defective parts. If you have determined that all of the other components are working properly, replace the moisture sensor.
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02 - Bosch Dryer Motor Relay

If both the door switch and dryer touchpad are working appropriately, it's possible the motor relay is defective. However, this is not that common of a problem. Before replacing the motor relay, check all the more commonly defective parts. If you determine that all of the other components are working properly, you can test the motor relay by using a multimeter and consulting the wiring diagram to help determine if it is malfunctioning.
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03 - Bosch Dryer Control Board

If both the door switch and dryer touchpad are working appropriately, it's possible the control board is defective. However, this is not that common of a problem. Before replacing the board, check all of the more commonly defective parts. If you have determined that all of the other components are working properly, replace the control board. (The control board cannot be easily tested, but you can try to inspect it for signs of burning or a shorted-out component.)
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04 - Bosch Dryer Main Control Board

If both the door switch and dryer touchpad are working appropriately, it's possible the main control board is defective. However, this is not that common of a problem. Before replacing the board, check all of the more commonly defective parts. If you have determined that all of the other components are working properly, replace the main control board. (The control board cannot be easily tested, but you can try to inspect it for signs of burning or a shorted-out component.)
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05 - Bosch Dryer User Control and Display Board

If the dryer's start/cancel button is only working intermittently, it's likely the user control and display board is malfunctioning and causing the dryer to stop running. A new board will need to be installed to resolve the problem.
Highly Likely

06 - Bosch Dryer Timer

If both the door switch and dryer touchpad are working appropriately, it's possible the timer is defective. However, this is not that common of a problem. Before replacing the timer, check all the more commonly defective parts. If you determine that all of the other components are working properly, test the timer by using a multimeter and consulting the wiring diagram. If the timer is defective, replace it.
Highly Likely

Frequently Asked Questions

My Bosch dryer starts then stops after a few seconds — what should I check first?
Could a faulty moisture sensor make the dryer stop even though clothes are still damp?
How can I test the motor relay or timer myself?
My start button is intermittent and the controls not working reliably. Is the user control and display board the problem?
How do I enter my model number or part number on RepairClinic.com to find the right replacement part?