A commercial dryer that needs two cycles to dry a load is nearly always losing airflow or heat. The most common causes, roughly in order of how often we see them, are a restricted exhaust duct or lint-clogged screen, a gas burner or electric element that is not delivering full heat, a failed thermostat or moisture sensor, and a drum or seal problem that lets heat escape. Fixing exhaust restrictions solves a large share of cases, and it also reduces fire risk.
The problem tends to creep up. Dry times grow by ten minutes, then twenty, and eventually staff run everything twice. Because laundries pay for gas or electricity on every cycle and lose customers or turnaround time with every delay, this is worth fixing early.
Check in this order
| Check | What to look for | Who |
|---|---|---|
| Lint screen and lint trap area | Lint buildup, torn screen, waxy film from fabric softener sheets | Operator |
| Exhaust duct and wall termination | Weak airflow at the outside hood, crushed or long duct, blocked flap | Operator or duct cleaner; technician for measurement |
| Makeup air | Closed doors or vents starving the dryers of air | Operator, building manager |
| Heat output | Little or no heat in the drum, burner not lighting, element not glowing | Technician |
| Thermostats, limit and moisture sensor | Dryer shuts off early or runs too long | Technician |
| Drum seals and door gasket | Gaps leaking hot air, loose door | Technician |
| Washer extraction | Loads leaving the washer wet because of spin problems | Operator; technician for the washer |
Airflow comes first
Dryers move a lot of air. If the exhaust cannot carry that air out, the heat has nowhere to go, the cycle runs long and the high-limit thermostat may shut the burner or element off. Clean the lint screen after every load and wash it with soap and water every so often to remove the film left by softener residue. Then check the outside hood while the dryer runs. You should feel a strong, steady stream of warm air. A weak flow or a flap that barely lifts points to a restriction in the duct.
Long duct runs with many elbows, crushed flexible duct and ducts that share a main with other dryers all increase restriction. Duct cleaning is a job for a specialist, and we can measure airflow and tell you whether the restriction lies in the duct or the dryer.
Gas dryers and the smell of gas
If you smell gas near a dryer, leave the building and call the gas utility from outside. Do not switch lights or equipment on or off. After the utility clears the building, call us before using the dryer again. A gas dryer that lights slowly, burns with a yellow flame, or produces a clicking sound without igniting has an ignition or burner problem that should be checked promptly.
Electric dryers
Electric dryers use heating elements and contactors. If the drum is warm but not hot, one element may have failed, or one leg of the power supply may be missing. Do not open the electrical compartment. A technician can test each element for continuity and measure voltage at the terminals.
Sensors, thermostats and controls
Many commercial dryers use a moisture sensor, a bar inside the drum that detects when clothes are dry. Coated with softener residue, the sensor reads wrong and the cycle may end too early or run too long. Wipe it with a cloth dampened with rubbing alcohol as the maker allows. If the problem persists, a thermostat or control board may be involved. The technician can test the thermostat and high limit against a reference thermometer, and check the control for correct timing.
Do not forget the washer
When loads come out of the washer soaked because of an extraction problem, the dryer has to do much more work. If wet loads are the pattern, look at the washer’s spin speed, drain and balance. Heavy items, such as towels, hold water and need good extraction. We repair both sides of the laundry.
What a technician does
- Measures exhaust airflow and static pressure where the equipment allows.
- Tests burner ignition, flame quality and gas pressure on gas models.
- Tests elements, contactors and wiring on electric models.
- Checks thermostats, high-limit and moisture sensor operation.
- Examines the drum, seals, bearings, belts and blower wheel.
We tell you what we found, whether the fix is routine or larger, and quote in writing. Tell us the make, model and serial number when you call, and describe how long cycles now take compared with before. That helps us bring the right parts.
We repair commercial dryers for hotels, gyms, clinics and laundries in Miami, Los Angeles, Houston, New York and San Diego. We are an independent repair company, not affiliated with any maker. Same-day appointments are often available, and our work carries a 30-day warranty.
FAQ
How often should I clean the exhaust duct?
It depends on use and duct length. Heavy-use laundries need regular inspection and cleaning by a specialist, often at least once a year, and more often when dry times start to rise.
Can fabric softener sheets cause long dry times?
Yes. They leave a film on the lint screen and moisture sensor that reduces airflow and confuses the sensor.
Why is the dryer hot outside but clothes stay damp?
Often the exhaust is restricted, so humid air stays in the drum. Check the screen and duct first.
Is it safe to keep running a slow dryer?
Restricted exhaust raises heat and lint buildup, which increases fire risk. Fix the cause rather than running double cycles.