If your dryer runs but leaves clothes damp, the first useful question is how it makes heat. Gas and electric dryers look almost identical from the outside and share most of their mechanical parts, but their heating systems fail in different ways and call for different safety rules. Here is how to tell them apart, what tends to go wrong with each, and where the safe do-it-yourself checks end.
Which Kind Do You Have?
Look behind the dryer. An electric dryer plugs into a large 240-volt outlet with a thick cord and has no gas line. A gas dryer plugs into a standard 120-volt outlet and has a gas supply line with a shutoff valve. The model label, usually inside the door, also says which type it is. Both types are common in Las Vegas homes, since many neighborhoods have Southwest Gas service and many others are all-electric.
The Parts Both Dryers Share
Most dryer breakdowns have nothing to do with gas or electricity, because both types share the same mechanical parts:
- Drive belt, idler pulley and drum rollers or glides. Squealing, thumping or a drum that will not turn usually starts here.
- Drive motor. A motor that hums but will not start may have a bad start switch or a jammed blower wheel.
- Door switch. A dryer that does nothing when you press start often has a failed door switch.
- Thermal fuse or thermal cutoff. A one-time safety device that opens when the exhaust overheats. On many dryers a blown thermal fuse stops the dryer completely, and on some it only cuts the heat.
- Cycling thermostat and high-limit thermostat. These regulate temperature and shut the heat off if it climbs too high.
- Moisture sensor bars and control board. Faults here make cycles end too early or run too long.
An important point: a blown thermal fuse is a symptom. Fuses usually blow because airflow is restricted, typically by a lint-packed vent. Replacing the fuse without clearing the vent often means it blows again.
How Electric Dryers Lose Heat
An electric dryer passes current through a coiled heating element in a metal housing. Common faults include:
- Broken element coil. Elements eventually burn through, especially after running hot because of a restricted vent.
- Half-tripped breaker. Electric dryers use a double-pole breaker. If one side trips, the motor can still run on 120 volts while the element gets nothing. Check the panel and reset the dryer breaker fully off and back on.
- Thermostats and thermal cutoff on the heater housing.
- Worn cord or outlet connection. Scorch marks at the terminal block or plug mean a loose connection. Stop using the dryer and have it inspected.
How Gas Dryers Lose Heat
A gas dryer uses an igniter that glows hot, a flame sensor (also called a radiant sensor) that confirms heat, and a gas valve with solenoid coils that open to feed the burner. Common faults include:
- Weak or broken igniter. The igniter glows but the gas never lights, or it does not glow at all.
- Failed valve coils. A classic symptom is that the dryer heats for a while, then stops heating once it is warm. The igniter glows, goes out, and the flame never lights.
- Flame sensor fault. The burner may not light, or may not turn off properly.
- Gas supply. A closed shutoff valve after a move or remodel, or a kinked flexible connector.
Gas dryers also produce combustion byproducts, including carbon monoxide, which the vent carries outside. That makes a clear, properly connected vent even more important on a gas unit.
Safety First
- Unplug the dryer before you open any panel. On a gas dryer, also close the gas shutoff valve.
- Do not disconnect, reconnect or repair gas lines or valves yourself. If you smell gas, do not touch light switches or electrical plugs, leave the home and call Southwest Gas or 911 from outside.
- Do not bypass a thermal fuse or thermostat, even temporarily. They exist to prevent fires.
- Keep a working carbon monoxide alarm in the home if you have gas appliances.
Safe Checks Before You Call
- Clean the lint screen and look into the screen slot with a flashlight for buildup.
- Check the outside vent hood while the dryer runs. You should feel strong, warm airflow, and the flap should open. Weak airflow points to a clogged or crushed vent.
- Look at the transition duct behind the dryer. It should be a short run of semi-rigid or rigid metal duct, not a crushed vinyl hose.
- Check the breaker (electric) or the gas valve handle position (gas).
- Try a timed high-heat cycle instead of a sensor cycle, which helps separate a heating problem from a moisture-sensor problem.
Why Vents Matter More in Las Vegas
The NFPA and the U.S. Fire Administration both name failure to clean dryers and vents as a leading factor in home dryer fires. Several local conditions make vents clog faster here. Fine desert dust and wind events load exterior vent hoods. Two-story homes and laundry rooms in the middle of a house often have long vent runs with several elbows, and some vent through the roof, where lint collects at the cap. In summer, a hot laundry room or garage adds to the heat the dryer has to shed. Longer drying times, a laundry room that feels hot and humid, or clothes that come out very hot are all signs to have the vent cleaned before replacing parts.
Weighing a Repair
Most heat repairs on either type, such as elements, igniters, valve coils, thermostats and fuses, are moderate and worth doing on a dryer in reasonable shape. Belts, rollers and idlers are routine wear items. Repairs get harder to justify with a failed main control board on an older electronic model, a rusted-through drum, or a motor failure on a dryer that also needs rollers, belt and bearings at the same time. A dryer's simple design means many keep running well past their tenth year with basic parts replaced.
If you are deciding which type to buy, base the choice on what your laundry room already supports, a gas line or a 240-volt outlet, because converting either one is a separate project.
Professional Help
Our dryer repair service handles gas and electric models from all major brands. We test heating components with a meter instead of guessing, and we check airflow so the new part is not the next one to fail. If your dryer sits on top of a washer, see our guide to stackable washer-dryer repair. You can check the neighborhoods we cover on our service areas page, then call us or book online.