Filed Under Dryer Repair
Gas dryers use a burner to create heat. This burner has a number of parts that are known to fail over time. You can test some of these parts, but some must be simply replaced based on certain symptoms.
The parts prone to failure in your burner assembly are:
Or the Flame Sensor
How a burner works: When the motor begins to turn, the motor switch closes allowing a current to reach the flame sensor. The flame sensor allows electricity to reach the igniter. The igniter then heats up to a temperature high enough to ignite the gas. Once the igniter is hot enough the flame sensor releases the igniter circuit which allows the current to run through the coils that open the gas valve. Gas then releases out past the igniter and lites fire and the heat is drawn into the dryer.
How to troubleshoot: Observation is key to troubleshooting a gas dryer.
If your dryer is hot at the beginning of the cycle but finishes cool then it is likely you have bad coils. As the coils age, they lose the ability to keep the gas valves open. This will sometimes cause the valves to open and close rapidly, resulting in a chattering sound. Unfortunately, the coils can’t be tested to verify the failure so replacing them is a decision based on the above.
If the dryer never gets hot, there are more items to check and test. The first item is the Igniter. There is a clear plastic connector attaching the igniter to the burner. Disconnect this and place your probes onto the two contacts of the igniter. The meter should read under 100 Ohms of resistance. Any reading above this means that the igniter needs replacing.
If the igniter passes the test then you need to test continuity on the flame sensor. You should have continuity between the two contacts. If not, then you need to replace the flame sensor.
If all of the above pass their tests, you need to make sure that there isn’t a build up of lint around the burner. Sometimes lint can block the flow of gas preventing it from igniting.
If you need more help with this, visit the Repair Forum.