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Speed Queen Commercial Dryer starts then stops

If your Speed Queen commercial dryer starts then stops — for example it runs briefly then stops or the dryer starts then stops after a few seconds — the most likely problems are a faulty user control and display board or a bad timer, especially if the start/cancel button is intermittent or cycles off mid-cycle. After those, check the moisture sensor, which can falsely tell the machine the load is dry and end the cycle, then the motor relay which can drop power to the motor. Less commonly the control board or main control board will fail and shut the dryer down. Before ordering parts, verify the door switch and front controls are working and use a multimeter to test relays or timers if you can; visually inspect boards for burned components. Enter your model number on RepairClinic.com to pull up the exact replacement user control, timer, sensor, relay, or control board that fits your dryer so you get the right part the first time.

01 - Speed Queen Commercial 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 - Speed Queen Commercial 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 - Speed Queen Commercial 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 - Speed Queen Commercial 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 - Speed Queen Commercial 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 - Speed Queen Commercial 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

Why does my dryer start then stop after a few seconds?
Can a bad moisture sensor make my dryer stop before clothes are dry?
How do I test the motor relay or timer when the dryer starts then stops?
Could the user control, main control board, or display board cause the dryer to start then stop?
How do I enter my model number or part number on RepairClinic.com to get the right replacement part?