Commercial Dryer Not Heating? Common Causes and Fixes

When a commercial dryer runs but does not heat, the problem usually comes down to airflow, ignition, gas valve coils, thermostats, or safety switches. For laundromats, apartments, hotels, and other shared laundry rooms, fast troubleshooting matters because one down dryer can quickly create customer complaints and backup loads.

The guide below explains common causes behind commercial dryer no-heat problems, including sail switch open faults, sail switch closed faults, glow-bar ignition issues, spark ignition problems, and blocked exhaust airflow. If the issue keeps returning, Commercial Laundries of West Florida can help with commercial dryer repair, replacement equipment, leasing options, and maintenance support.

No Heat

The most common problem that occurs in commercial dryers is a lack of heat. The drum continues to turn, but the clothes just won’t dry.  The most common problem is a bad ignition, depending on what type of ignition system the dryer runs on.

• Glow-Bar Ignitions – A glow-bar ignition works by sending electricity through a heating element until it is hot enough, which signals the gas valve to turn on. Check the glow bar when the dryer is in operation. If it doesn’t begin to glow red hot, you will need to check the voltage.
• Spark Ignitions – Spark ignitions light the gas by generating a spark rather than heating the glow-bar. If you do not hear the spark igniting, or it won’t stay on, you may have a faulty ignition cable.
• Gas Valve Coil – If the gas valve doesn’t click, or the glow-bar is turning on and off, or the spark is working correctly, you may be experiencing an issue with the gas valve coil.
• Sail-Switch – The sail-switch is a component that pulls in when the air starts circulating in the dryer. Heavy lint buildup or a blocked exhaust vent can reduce circulation, causing the sail-switch to fail. This, in turn, shuts off the heating system. Make sure the sail-switch is properly aligned.
• Ignition Modules – If no voltage is coming through your ignition modules, you may have an issue with your transformer.

A dryer that does not produce any heat is simply the most common issue. In our next post, we will walk you through two more issues that can happen to your commercial dryer. When you need new commercial dryers in Florida, contact Commercial Laundries of West Florida. We offer the highest quality laundry equipment available to buy, rent, or lease and provide ongoing support for the equipment. Several financing options are available.

Questions and Answers

Q: Why is my commercial dryer running but not heating?
A: A lack of heat can be caused by faulty gas valve coils, a broken igniter, or a malfunctioning thermostat. Checking these components and performing regular maintenance can prevent prolonged downtime.

Q: What causes a commercial dryer to take too long to dry clothes?
A: Clogged lint screens, restricted exhaust vents, and failing heating elements can all contribute to long drying times. Cleaning lint traps and checking airflow can help resolve the issue.

Q: How can I prevent frequent breakdowns in commercial dryers?
A: Regularly inspecting and cleaning the machine, ensuring proper ventilation, and replacing worn-out parts before they fail can extend the lifespan of a commercial dryer and prevent costly repairs.