A faulty thermal fuse is among the most common causes for a dryer not heating up. You can find the thermal fuse on the blower housing or at the dryer’s heat source. A defective thermal fuse needs to be replaced.
Gas Valve Solenoid
Another possible cause why a dryer won’t heat is a faulty gas valve solenoid coil. You can find one or two gas valve solenoid coils in a gas dryer. In the dryer, they serve to open the gas valve ports letting the gas get into the burner assembly.
The igniter is a part that uses heat to make the gas move into the burner assembly. If there is a problem with the igniter, you will have to replace it so that the gas will start igniting again.
To make the dryer heat again, you need the flame sensor to be working properly. This device detects the heat emitted by the flame.
The heating element is crucial for the system. This device is responsible for warming up the air before it gets into the drum. A defective heating element needs to be replaced.
Heating Element Assembly
This part of the dryer is responsible for warming up the air before it gets into the drum. If it is worn out, the dryer will not make heat until you replace the heating element assembly.
Check out the fuse box or circuit breaker to make sure there are no problems with the incoming power. Alternatively, you may determine whether everything is fine with voltage using a multi-meter at the outlet. Your dryer needs 240 volts to work properly.
High Limit Thermostat
If the dryer is heated too much, the thermostat may turn off the burner. The high-limit thermostat is designed in such a way that it does not let the dryer overheat.
You have chosen the settings that do not use heat
The AIR DRY Cycle and the AIR ONLY option use only cold air to dry the items inside the dryer. So, you cannot expect any heat when you opt for these settings.