Here are some common issues that might need dryer repair:

Dryer not heating: In an electric dryer, this could be due to a faulty heating element, thermal fuse, or thermostat. In a gas dryer, it could be due to a problem with the gas valve solenoid, igniter, or flame sensor.

Dryer not spinning: This could be due to a worn-out drive belt, problems with the motor, a faulty door switch, or issues with the roller or idler pulley.

Dryer not starting: This could be due to an electrical problem such as a tripped circuit breaker or blown fuse, a faulty start switch, door switch, or thermal fuse.

Dryer making unusual noises: This could be due to a problem with the drum bearings, roller, or belt, or issues with the motor or idler pulley.

Dryer taking too long to dry clothes: This could be due to a clogged vent, a problem with the heating element (in electric dryers), or a faulty gas valve solenoid (in gas dryers).

Dryer shutting off too soon: This might be due to a problem with the thermostat, moisture sensor, or cycling thermostat.

Repairing these problems typically involves troubleshooting the issue, identifying the malfunctioning component, and then fixing or replacing it. Depending on the complexity of the issue, professional appliance repair technicians may be needed, particularly when dealing with electrical or gas-related components.

Some simpler problems might be suitable for DIY repairs, like cleaning the lint filter, checking the vent for blockages, or replacing a drive belt.

Regular maintenance can help prevent many common dryer problems. This might include tasks like regularly cleaning the lint filter and vent, checking and replacing the vent hose as needed, and ensuring the dryer is level. These tasks can help maintain the efficiency and longevity of the dryer.