90448 LG Dryer - Instructions

I noticed the flame would start, then quit after about 15 seconds. I checked the flame detector, and found the lenze cracked. I replaced it, and it's as good as gold.

It looked like a hard job to take the drum out to get at the part. But the top was off with 3 screws, the front about 6 I think. Then the front frame, only 4 screws. I think setting the belt tentioner was the hardest thing to do.

Done in 45 minutes, both the job, then the next load of laundry.

The first thing I did was locate a copy of the Service Manual (not the User / Owner Manual). After looking at that and looking online I learned that there is no sensor for the Flow Sense feature itself. The Flow Sense doesn't detect a blockage. It detects excessive heat and the manufacturer has simply concluded that too much heat is most likely caused by a blocked duct and then it activates the Flow Sense safety feature: cutting off the heat source. Since I knew it was a heat problem I figured I'd get inside and check the two thermostats and the igniter. Igniter was fine, one thermostat was fine, the other one - the High Limit Thermostat - was giving inconsistent readings. I replaced it. Here's how: First I took the dryer apart. This is a little time consuming. There are a lot of parts that need to come out. I recommend that you put the screws in small baggies with a note as to where you took them out of so that you know where they go when you put it back together. You need to remove part of the back, the top and the front. I removed the electrical box because that is what is shown in the manual but I'm not convinced that I needed to. See if you can get the rest of the dryer apart without removing it but if you have to remove it it's not that big of a deal. It's a little tricky to detach the wire harnesses is all. And extra steps, of course. I did not remove the drum. Instead I just reached inside with the front off and pulled the wires off the thermostats to test them for resistance with a multimeter. It was kind of a pain and a little awkward but I did not want to mess with the drum tensioner. Once I figured out that the High Limit Thermostat was the likely culprit I removed it - which required a very short Phillips head screw driver and some patience since I could not actually see one of the screws. But all good. Just remember which wire goes on which terminal. Make a note for yourself: gray back / red front - something like that. Then I ordered the part and installed the new one and rebuilt the dryer in reverse from what I did.

Now, here's the thing: I actually did two things: aside from changing the thermostat I also thoroughly cleaned out the dryer. Somehow a lot of lint built up in there - no idea how since it all appeared to leave the dryer through the vent. but there must be some small gap somewhere. I cleaned everything including the flame detector. When I put it all back together it worked but I'm not 100% sure that the thermostat was bad. It's at least possible that all the lint and dirt was messing with the way the thermostats behaved. So what I would recommend, if you have this problem, is to clean it out first and then put it back together enough to run it and see of the heat comes on. It will take maybe 30-60 seconds for the heat to come on while the igniter lights. If not, go ahead and replace whichever thermostats or other parts you think are broken.

I did not do the repair I hired the propane company to do it . It was too difficult for me.they removed top & front of dryer .removed & replaced gas orfice reinstall all parts that were removed. Install and test dryer IT cost me $91.59 for labor & $24.65 for the part & shipping.If the dryer had a side access near the gas valve it could have saved me the cost of labor. I could have done it myself.

Pull off the top and front of the dryer and reached in and replaced the part it was easy. Had to clean all the dryer out real good with from the lint

Initially replaced igniter. Didn't think it was bad though. Read other suggestions on another website. None were the correct diagnosis for my situation. And when I figured it out they did not offer correct part. The dryer thermistor temp sensor (probe sensor) is what I replaced. Found it on Parts Select. I did replace other parts also. But that's the one that ultimately was the issue.
Was not hard at all if one is even a little handy.

There’s all sorts of videos on it I watched. It was actually very simple

Followed the instruction on video.was great after three parts now is OK .we have heat.still cheaper than having it service.

Completely had to dismantle the dryer to get to the igniter.
The screw holding the igniter is a SOB to get at for extraction, and even worse putting back.,

With a thin flat screwdriver I was able to pry out the old door switch, I replaced it with the new door switch, pushed back in dryer and so far is working since I installed a month ago.

I replaced the thermistor, then the gas ignitor which were easy to get to once the drum was out. The gas is still not igniting so not sure where to go from here. Putting the drum belt back on took some muscle. But then I'm 71.

FIRST REMOVED THE LID ON TOP OF DRYER.THEN THE CONTROL PANEL AND THE STEAM TRAY. HAVE TO UNCLIP TWO HARNEST CONNECTORS. REMOVED THE FACE PLATE THAT HOLDS THE DRYER WALLS TOGETHER ALSO REMOVE TO SENSOR HARNESS CLIPS. .REMOVED THE BELT FROM MOTOR. TOOK DRUM OUT . UNCLIPPED MOTOR COLLAR SNAP CLIPS DISCONNECT THE MOTOR HARNESS. INSTALL NE MOTOR AND CONNECT HARNESS INSTALL CLIP . REINSTALL DRUM AND PUT BELT ON. CONNECT HANESSES AND INSTALL FACE PLATE. INSTALL CONTROL PANEL AND THE TOP LID.

Called LG on the phone and they gave the button presses for diagnostics, which then gave the HST code, saying the Humidity sensor was bad.
The part was described as the Humidity sensor module. Actually it's just the wire leads for the sensor which must be electronic and only accessible by disassembling the dryer. There were descriptions about cleaning the wires, perhaps because some people use dryer sheets which cause a buildup on the wires and prevent them from doing their job. I use wool balls and have no buildup on my wires and replacing them did not fix the sensor, because the module accessible inside the dryer is not the moisture sensor, but only the wire leads.

The installation of the gas orifice was actually simple. Unscrew the old orifice and screw in the correct orifice. Tricky part of the process was accessing the area of the gas valve.

Followed YouTube video repair process. The only problem is that the door hinge has plastic bushings attached. A couple broke and the parts listing does not show the bushings, nor does the hinge come with them. The door is a bit loose without them. Nonetheless, the repair did the job for now.

Despite the young age of this dryer, and failure of all the other trials to fix the problem, I figured maybe the igniter is the problem. Ordered one. Followed a U tube video to take the unit apart. Noticed immediately that there was lots of lint pretty much everywhere inside the cabinet. Come to find that the blower and the vent had never been connected, with about two inches gap. So, some of the exhaust was going out the vent hose, but lots was not. In fact, lint had coated the propane jet and the air mixer assembly. Replacing the igniter was not particularly difficult, once the dryer was in lots of pieces. I did not test the igniter before replacing it. I did connect the vent outlet to the blower and secured it. End result was a perfectly functioning unit and a happy wife. I don't recall reading about this as a possible cause of propane odor and failure of the unit to heat up.