My electric LG dryer has the flow sense and dying and cooling flashing. How to stop it

Most Dryers has a thermal switch that when the air flow gets so hot it will shut down the dryer until it cools down or on some models the thermal switch has to be replaced .. The most common problem to cause this is a restricted air flow somewhere in the exhaust of the heated air causing the dryer to reach too high of temp, which could cause a fire .. Hope this information is help full......

Call LG people before you call the service man.
Really, you have no heat. Check out the heating circuit...heater, t/stats; vent. etc. Something is sensing that the filter is blocked when it is not....check air flow.
I doubt the board is a problem at this point.

Is this the gas or electric model you have?

There is a thermal cutoff switch in all hairdryers. If you by accident block the air intake or the filter is dirty, then the heat from the nichrome wire is not sufficiently cooled to keep the thermal switch from tripping. After the dryer cools down then the thermal switch resets and allows operation. Be sure the air flow into the dryer is not obstructed

I had the same problem, Check Filter light blinking and beeping, could not select drying type or start dryer. Short story, turned out to be the Less time button was stuck pushed in. Long story, a week before I had replaced the drum rollers and belt, everything was working fine for the week after then this problem. Totally by accident, after trying all the recommended actions (unplugging, pushing buttons, etc.) leaning on the right front corner would stop the beeping and allow the machine to work. Pushing all the buttons, I found the Less time button would not click. Apparently, when I took the control panel off to change the rollers and belt I flexed the control panel enough to misaligne the button and switch. Pulling the back of the control panel loose and making sure the push button and switch were aligned and working correctly everything works fine now.

I had the same problem & just had a repair man out. A Thermal Fuse was blown - this occurs if you run your dryer a lot & don't let the cycle complete so the dryer cools down. If you stop the dryer mid cycle it's important to leave the door open so it can cool down or run a timed dry cycle on Air Only so the dryer can cool off.
My repair took less than 30 minutes & you can get the Thermal Fuse (item #2986) on www.repairclinic.com - part is $13.05 + shipping. Shipping varies depending on how soon you want the part.
Thermal fuse. If the dryer overheats, this device stops the flow of electricity to the heat source and/or the entire dryer. It is located on the blower housing and cannot be reset. The most common cause for overheating is a vent tube clogged with lint, a birds nest or other debris.
To test it, use an Ohm meter or continuity checker, if no continuity it must be replaced. Unfortunately, you can't tell if it's bad by looking at it.

Maybe a sensor at the back sensed overheating. You might be able to remove the backplate and search for a little button, which acts as some sort of reset button. (I do have a different tumble dryer, but it's the same brand and had similar problems). Maybe more ventilation is needed to prevent this from happening again.

The cooling light is always on, it flashes when it is in that part of the cycle, sounds like he put it in to a test mode. Was it a thermistor that he changed?
No heat, sounds to me like a thermostat might be blown. Call the guy back, if you haven't already.

Sgt 48

call svc tech under warrenty, also sensor rellies on clothes touching two shiny strips to sense the dryness of the clothes ussaly in front or rear of drier drum or rather back or front wall inside wet clothes short the bars and stalls timer when they are dry does not short bars so sensor knows dryness by resistance of short tilt drier front or back where ever bars are to make shure clothes main tain contact lots of time this cures the promblem