--- title: "Commercial Laundry Tumbler Not Heating: Loads Still Damp After a Full Cycle: Causes and Fixes" description: "A commercial laundry tumbler not heating runs and turns but blows cool air, leaves loads damp after a full cycle, or takes two cycles to finish what used to…" url: "https://commercialappliancerepair.center/problems/commercial-laundry-dryer-not-heating/" --- # Commercial Laundry Tumbler Not Heating: Loads Still Damp After a Full Cycle A commercial laundry tumbler not heating runs and turns but blows cool air, leaves loads damp after a full cycle, or takes two cycles to finish what used to take one. ## What it usually means. A commercial tumble dryer, gas or electric, heats air and pushes it through the load and out through a duct. On a gas model, the burner lights only after the controls prove that air is moving through a switch in the airflow, and a flame sensor confirms ignition. On an electric model, elements heat under the same airflow check. Every tumbler also has high-limit controls that cut the heat if the air gets too hot. So the most common cause of no heat is not a failed part at all but air: a lint screen packed at the end of a busy day, or an exhaust duct clogged with lint or crushed behind the stack so the air cannot leave. When air slows, the airflow switch does not close or the high-limit trips, and the burner or elements stay off. Settings play a role too: a store that set a machine to low heat, or a card system with a no-heat cycle selected. After those come the ignition parts on a gas model, the igniter or the gas valve coils, and the elements on an electric one. Because lint is also where laundry fires start, a no-heat case is a reason to look at the duct. The 6 causes, cheapest first Answer these first 01 Does the tumbler turn and blow air, but cool, or does it not run at all? 02 When were the lint screen and the exhaust duct last cleaned? 03 Is it gas or electric, and on gas, do you hear the burner click and light? 04 Is the heat setting, or the card or coin price setting, on a low or no-heat cycle? 05 Does the outside exhaust hood open and push warm air when the machine runs? ## Check these before you book. Commercial laundry tumbler not heating: 5 checks, and none of them costs anything. 01 Clean the lint screen completely, and look for lint collected behind it. 02 Check the heat setting on the control and, in a vended store, the cycle and price settings in the card or coin system. 03 Run the tumbler and see whether warm air comes out of the outside exhaust hood. ### Also worth checking - If you smell burning or see smoke, switch it off, keep its door closed, and follow the burning smell page. - Leave the gas valve, the burner and the wiring to the technician, and never reach into a drum that is turning. ### How soon does it need a visit? A tumbler with no heat can usually wait for a booked visit within a couple of days, with an out-of-order sign on it. One that smells of burning, trips its high-limit repeatedly or smells of gas is handled the same day through the urgent pages. ## The causes, cheapest first. 6 things commercial laundry tumbler not heating: loads still damp after a full cycle turns out to be, from heat setting on low or no heat to igniter or gas valve coils failing to light. [The cost guide](https://commercialappliancerepair.center/cost/) 1. 01 no repair ### Heat setting on low or no heat A cycle or price setting chosen for delicates or changed during setup can leave a tumbler on air only. Checking the setting in the control or the card system restores heat. No repair: check it yourself 2. 02 no repair ### Lint screen packed at the end of the day A full screen chokes the airflow, and the airflow switch keeps the heat off. Cleaning it every load or every shift keeps the machine drying and safe. No repair: check it yourself 3. 03 low ### Exhaust duct clogged or crushed behind the stack Lint in the duct or a kinked section behind the machine slows the air until the heat shuts off. The duct is cleaned and any crushed section replaced. [Fixed by commercial laundry machine repair](https://commercialappliancerepair.center/services/commercial-laundry-machine-repair/) [On a commercial laundry machine](https://commercialappliancerepair.center/types/commercial-laundry-equipment-repair/) 4. 04 low ### High-limit tripped from a choked duct Heat builds when air cannot leave, and the high-limit opens to protect the tumbler. After the duct is cleared, the limit is tested and replaced if it has failed. [Fixed by commercial laundry machine repair](https://commercialappliancerepair.center/services/commercial-laundry-machine-repair/) [On a commercial laundry machine](https://commercialappliancerepair.center/types/commercial-laundry-equipment-repair/) 5. 05 low to moderate ### Airflow switch not proving A switch stuck with lint or bent out of position reports no air even when the fan is running. It is cleaned or replaced and the burner is watched through several starts. [Fixed by commercial laundry machine repair](https://commercialappliancerepair.center/services/commercial-laundry-machine-repair/) [On a commercial laundry machine](https://commercialappliancerepair.center/types/commercial-laundry-equipment-repair/) 6. 06 low to moderate ### Igniter or gas valve coils failing to light An igniter that glows but does not light the burner, or coils that open the valve only when cold, give heat on and off. The failed part is replaced and the flame confirmed. [Fixed by commercial laundry machine repair](https://commercialappliancerepair.center/services/commercial-laundry-machine-repair/) [On a commercial laundry machine](https://commercialappliancerepair.center/types/commercial-laundry-equipment-repair/) ## What else it could be. Most often confused with commercial laundry machine not spinning: loads left soaking wet, then restaurant equipment burning smell: scorched oil, hot wiring or lint. [All problems](https://commercialappliancerepair.center/problems/) Codes that come with it - [`TEMP SENSOR SHORT` Dexter · Sensors and probes](https://commercialappliancerepair.center/error-codes/dexter-temp-sensor-short/) - [`TEMP SENSOR OPEN` Dexter · Sensors and probes](https://commercialappliancerepair.center/error-codes/dexter-temp-sensor-open/) - [`ESH` Huebsch · Sensors and probes](https://commercialappliancerepair.center/error-codes/huebsch-esh/) - [`EoP` Huebsch · Sensors and probes](https://commercialappliancerepair.center/error-codes/huebsch-eop/) - [`EAF2` Huebsch · Sensors and probes](https://commercialappliancerepair.center/error-codes/huebsch-eaf2/) - [`E Ht` Huebsch · Temperature and alarms](https://commercialappliancerepair.center/error-codes/huebsch-e-ht/) [2 more codes, by make](https://commercialappliancerepair.center/error-codes/) Also related - [**Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display** 8 causes](https://commercialappliancerepair.center/problems/commercial-error-code/) ### Commercial Laundry Machine Not Spinning: Loads Left Soaking Wet 6 causes Gas, fire, food at risk or water near power ### Restaurant Equipment Burning Smell: Scorched Oil, Hot Wiring or Lint 6 causes Gas, fire, food at risk or water near power ### Commercial Kitchen Gas Smell Along the Cooking Line: Clear the Room First 6 causes ## The makes it happens on. 35 makes on this site; commercial laundry tumbler not heating: loads still damp after a full cycle can show up on any of them. Each mark opens that make's own page. [All 35 brands](https://commercialappliancerepair.center/brands/) ## Commercial Laundry Tumbler Not Heating: Loads Still Damp After a Full Cycle, where we come out. 9 metros, each with its own page. 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What is the first thing to check? The lint screen and the exhaust duct. A choked airflow switches the heat off in most tumblers, and it is also the most common cause of laundry fires. ### How often should the exhaust duct on a commercial laundry stack be cleaned? It depends on how many loads you run; busy laundromats often need it several times a year. A PM plan can include it. ### The gas tumbler clicks but does not light. Is that the igniter? It can be, or the gas valve coils or a missing airflow proof. The technician tests each part in turn. ### Can the store's card system cause a no-heat problem? Yes, if a cycle or price is set to air only or a low heat level. Checking those settings is worth doing before booking. --- **[Read on the site: Commercial Laundry Tumbler Not Heating: Loads Still Damp After a Full Cycle: Causes and Fixes](https://commercialappliancerepair.center/problems/commercial-laundry-dryer-not-heating/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**