My mom's 5yo LG gas dryer (DLGX7601KE) suddenly quit heating

[ch!l@q!l3]

The control panel just shows "GAS," and no other errors. The igniter glows fine, but we never get any gas, no click from the valves, nothing.

We've checked the gas supply, all the thermostats, and even the igniter itself, all good. The gas valves also show correct resistance. But when we test the voltage at the gas valve connectors during a cycle, there's nothing there.

We found the service manual, and it looks like the motor controls the gas valves.

My mom thinks she might've put a super wet load in before this happened, and we did see some corrosion inside.
Now, checking the motor, its resistance is off, and the gas valve terminals on the motor show an open loop.

Could this really be a bad motor? Or are we missing something here before replacing it?

 

[ToastAndBoast]

It seems like you've done a great job of pinpointing the problem. The igniter's functioning, and the gas valves have the right resistance, but it looks like there's no voltage getting to them during the cycle. Since the motor controls those valves and you've detected an open circuit at its terminals, the motor or the control board is likely faulty.

Before you replace anything, it's a good idea to double-check any safety switches that might be interrupting the power supply. If those are all okay, then it's probably time to consider the motor or control board as the main issue. Generally, replacing the motor tends to solve this type of problem.

 

[PineappleTough56]

It seems like you've done a great job of pinpointing the problem. The igniter's functioning, and the gas valves have the right resistance, but it looks like there's no voltage getting to them during the cycle. Since the motor controls those valves and you've detected an open circuit at its terminals, the motor or the control board is likely faulty.

Before you replace anything, it's a good idea to double-check any safety switches that might be interrupting the power supply. If those are all okay, then it's probably time to consider the motor or control board as the main issue. Generally, replacing the motor tends to solve this type of problem.

Thanks for this. Just wondering how do you safely test things like voltage or resistance on dryer components?

 

[chosen one]

If the gas valve switch is showing open when it should be closed, that would explain why the valves never get power. With the other components testing fine, it just sounds like the motor switch has failed. Replacing the motor is probably the next step