Gas Dryer Not Heating
Gas Dryer Not Heating | Troubleshooting a gas dryer can be quite complicated. In fact, it’s not uncommon for appliance service technicians to say, “I don’t work on gas dryers.” Usually, when a technician says this, they are calculating the estimated benefit of the repair, versus the potential liability. That’s why good, experienced appliance service technicians love working on gas dryers. The fact is that if you know what you are doing, the risk is relatively low. Gas dryers have several built-in protections, to prevent gas from flowing into the burner when it is not supposed to.
Almost all gas dryers manufactured today operate with the same burner control systems. In fact, most home appliance manufacturers source all of their gas dryer burner parts from one or two suppliers. Therefore, a gas dryer coil set up for a Frigidaire dryer, in most cases, is the same as gas drying burner coils in a Maytag or Whirlpool dryer.
When the timer or electronic control, and the control thermostat or thermistor are satisfied, power is applied to the lighter through the primary coils, and it begins to glow red. The heat from the light heats the flame sensor to a point that is enough for the gas to ignite. The current that passes through the primary coils creates an electromagnetic field that lifts a plunger inside the gas valve and allows gas to flow to the second portion of the gas valve. At this point, no gas comes out of the valve. The heat from the lighter flexes a bimetal in the sensor that opens the circuit to the lighter. Since electricity always takes the path of least resistance, if you have the option of going through the low resistance lighter, or the higher resistance coils, you will always choose the lighter.
Once the bimetal flexes and takes the circuit path through the lighter, the current will flow through the secondary coil in the coil kit. When that happens, the coil creates an electromagnetic field, lifting a plunger on the gas valve, which until now has been preventing gas from flowing to the burner. And since the light is still red hot, because it hasn’t had time to cool down, once the gas starts to flow, it will light up. The heat from the gas burner will keep the bimetal in the flame switch flexed, keeping the contacts close, allowing current to flow through the secondary coil in the gas valve, allowing gas to continue to flow.
Under normal conditions, the control thermostat or electronic control is interrupted by interrupting the circuit to the gas burner assembly, causing the coils to lose their electromagnetic fields, stopping the flow of gas. Once the control thermostat cools and closes the contacts within it, or when the electronic control energizes the heat relay, the energy is applied to the lighter again, to start the sequence again. This is the best article for your washing machine repair near me.
