I have an LG DLG7188WM gas dryer. The "cooling" light is always on and there is no heat. I have confirmed the vent line is clean. Your help is really appreciated! 3 boys and a labrador make for a whole bunch of laundry :)

If it's an electric drier the heating elements could be bad. If gas, the valve could be bad.

I would check your vent. It may be clogged somewhere. Cool light is normal.

Hi, If you have a gas dryer.
The most common problem with a gas and no heat is the ignitor going bad...

Here is a tip that I wrote about that problem...

Gas Dryer not Working Gas Dryer Not Heating
http://www.fixya.com/support/r4398592-gas_dryer_not_working_gas_dryer_not

If your dryer is electric..
There could be a number of different problems...
Check out this tip that I wrote about this problem...

Dryer Troubleshooting Electric Dryer won t Heat
http://www.fixya.com/support/r3866345-dryer_troubleshooting_electric_dryer_won

heatman101

Several things can be the problem.
Is 220v present @ the outlet?
Heat element?
High limit thermostat?
Main computer?
Bad dryer cord? Ect...

Proabably time for a service call.

Take top off, then start unit. You can see orange glow in about 10 seconds on front bottom right by looking down from the top if the glow igniter is working.

Most likely the igniter needs replacing tho it also could be thermistor or lack of gas flow or a few others.

I believe that it does. All of these parts should be functioning properly in order to dry the clothes well.

Try cleaning off the two curved metal bars (about 4 inches long) on the inside near the lint filter. They are what senses the moisture on automatic dry. When you use fabric softener sheets, the stuff from the fabric softener sheets can coat the bars, which makes the dryer think the clothes are already dry, and puts the dryer into cool down. (using time dry will also take the moisture sensor out of the cycle, if you'd like) This should be a Fix-Ya for your problem.

The vent is clogged.  To make sure, disconnect the vent from the dryer and run the dryer normally.  If your clothes dry normally, then have a professional vent cleaning company take care of the vent.  
The cooling light will always stay on during the run.  When it is blinking, the heat has stopped and is in the cooling process.
If there is no heating, you have a problem with the high limit switch or something else electrical and needs to be addressed by a qualified LG technician.

Same problem after 1 year of use. In the past couple of months, the Sensor and Cooling mode light stay on and unit does not dry.