I recently bought a used LG DLG2532
dryer. The seller assured me that he never had any problems with it.
He had it configured for propane (and had lost the original NG orifice), so I had to order a new NG orifice, install it, and adjust the gas-control screw all the way out for NG.
Now... about 2/3 of the time, the manual-reset thermostat (part M230 in the service manual diagram... or LG part number #6931EL3003C) trips and the dryer won't heat anymore until I take the front off and reset the little button on it. I'd like to find out why this is happening.
The after-dryer ducting is about 10 feet of straight (non-corrugated) 4-inch steel, with a couple of steel adjustable elbows. According to the manuals, this is much shorter than the max duct length. Lint screen is clean (although the "check filter" light always blinks when I turn the dryer on)
I've got a Fluke infrared thermometer, and the side of the dryer does get pretty hot (I measured up to 144F at one point). Not sure if that's normal.
So, my questions are:
1 - What are some common causes of this? I know the impeller/fan is the last thing before the air leaves the dryer. If there's some air leakage between it and the flame funnel, could that cause there to be not enough air being drawn out of the funnel (like the extreme case when someone tests the dryer with the front off or door open)?
2 - There are two thermostats: One is a auto-resetting lower-temp one that is supposed to trip at 203F +_ 7F and the high-temp manual-reset one that's supposed to trip at 212F +_ 12F. It strikes me as a little odd that the lower-temp one isn't tripping first. Is it plausible that the higher-temp one has gone bad and is tripping at an abnormally-low temp? How would I test for this? Or, has the lower-temp thermostat failed because it's not tripping *before* the high-temp? Should the lower-temp thermostat be tripping as a part of the normal operation of the dryer (ie, is that the primary way that the temperature is controlled) or are the gas valve and orifice supposed to be calibrated to deliver the right amount of gas and neither thermostat should normally be tripping?
High Limit Thermostat Part # 6931EL3003C