I have and lg gas dryer modeldlg7188rm cooling light is on constant wouldnt heat atall. replaced gas valve now it will fire up but after a few seconds shuts down. Cooling light still on on any cycle is it the control board? everything else checks out ok i think. Have seen this problem posted alot but nobodysays how they fixed it. the dryer is 6 years old.

SOURCE: After first Ignition cycle igniter stays on too briefly to open gas valve gas.

Valid Most likely the problem with your dryer is the coils for the gas valve. Remove the access door (on the bottom right side on the front panel) and you can see the gas valve with three coils on top of it. They are coming as a kit with complete instruction. The part number for this kit is AP2669614.You can buy it here http://click.linksynergy.com/fs-bin/click?id=SrmyP8LkIos&offerid=92089.542517043&type=10&subid=

Whirlpool 12001348 Coil Kit gas Valve 3 Coils Older...

appliancepartspros.com

SOURCE: whirlpool imperial series 6 cycle/3 temp electric dryer wont heat

My dryer is not heating, where is the cupling at in the dryer i have it open tho

SOURCE: dle2532 lg dryer, cooling light is always on

I'll take a stab that you use dryer softener sheets. These will deposit a coating on the two metal sensor bars (about 4 inches long, very near the lint filter inside the drum) which prevents the sensor from "seeing" that the clothes are still wet, so the dryer jumps to the cool down portion of the cycle. Clean the metal bars off and it should work again. (note: the bars are not in the cycle if you choose time dry instead of using the automatic cycles)

SOURCE: Kenmore Gas Dryer Gets Hot, Shuts Off Early in Cycle

Sounds like a faulty high limit or cycling thermostat. The thermostat tells the dryer to heat until the interior of the dryer reaches a certain temp. It should be mounted on the exhause duct inside the back of the dryer. It should look something like the one in the picture:



Hope this helped and best wishes.

SOURCE: LG DLG5988W Gas Dryer (NO HEAT)

I'm pretty sure that the cooling light is always on and blinks when it is cooling. I look at my brother's and he has the EQ bar and it acts the same.