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Speed Queen Commercial Dryer starts on its own

If your Speed Queen commercial dryer starts on its own or keeps running when it should be off, the most likely cause is a faulty motor relay that is sticking or shorting and closing power to the motor. If the relay checks out, the next suspects are the timer and then the main control board or other circuit boards, which can fail and send power unexpectedly. Less common causes are a failing touchpad or a faulty user control and display board, especially if the start or cancel button works only intermittently. Start by checking the user controls for obvious issues, then test the motor relay and timer with a multimeter using the wiring diagram, and inspect control boards for burned components or visible shorts. If you confirm a bad part, replacing the relay, timer, or control board will stop the dryer from starting on its own. Use RepairClinic.com to enter your model number and find the exact replacement part that fits your dryer so you can fix the problem without guesswork.

01 - Speed Queen Commercial Dryer Motor Relay

If the dryer touchpad is 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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Highly Likely

02 - Speed Queen Commercial Dryer Timer

If the dryer touchpad is 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.

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Common

03 - Speed Queen Commercial Dryer Control Board

If the dryer touchpad is 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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Common

04 - Speed Queen Commercial Dryer Main Control Board

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Common

05 - Speed Queen Commercial Dryer Touchpad and Control Panel

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 start running. A new board will need to be installed to resolve the problem.

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Less Common

06 - Speed Queen Commercial Dryer User Control and Display Board

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Less Common

Frequently Asked Questions

My dryer won't stop or sometimes starts on its own — what could cause that?

Dryer controls not working: can a bad touchpad or control board make the dryer start without pressing start?

Can I test the motor relay or timer myself to see if they cause the dryer to start on its own?

Do I need to replace the main control board, or can it be tested?

How do I enter my model number or part number on RepairClinic.com to get the correct replacement part?

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