How to Troubleshoot & Replace Whirlpool AP6008273 / WP3387223 Dryer Moisture Sensor Bar

I replaced the Dryer Themister and the Moisture Sensor Bar. Most of the time was spent cleaning the lent from the dryer. 

Researched the likely causes for the failure on the Web using Google search and YouTube. Ordered all of the replacement parts that could fail and cause this problem. Also ordered a replacement belt. Removed the lower front panel, tested the fuse with an ohm meter and found had blown. Tested and found the other sensors were OK. However found a blanket of lint covering the inside of the machine. Needed to remove the upper front cover, dryer top, and drum to completely vacuum out the lint that had accumulated in the machine. Removed the fan housing. Cleaned the fan and housing thoroughly and replaced the covers, sealing with new foam tape. Replaced the fuse and the thermostat. Oiled the rollers and replaced the drum using the new belt. Reinstalled the top and front covers. Checked the vent line for obstructions. Tested the machine. The igniter glowed, the gas valve opened and the flame lit! Watched as it cycled on and off several times. Replaced the lower cover. All done! Packaged up the unused parts and returned them for a full refund. I didn't mind paying for the return shipping, considering how much I sacked by doing the repair myself. Five full loads later and the machine is running fine. 

Your videos are wonderful! I ordered the moisture sensor bar and did more research while waiting for it to arrive and realized there are 2...ordered again and got the second and the thermister. Yaaa! They both arrived the same day! OK I didn't look like Matt in the video...a lot more cussin', sweating and standing on my head...haha!...and the little wires felt like they were welded on due to the age of my dryer BUT it's running like a champ now! For the first 5 or 6 loads I would stand and listen just to see if all was well! You have to realize all this coming from a 64 yr old woman! It was a challenge but if I can do it so can you! I don't know whether to hug the dryer or Matt...maybe both! Thanks guys for your site and all the help!!! 

I youtubed a fix which called for checking resistance over the heater coil, the thermostat, and the high temp cutoff. The high temp cutoff was bad. I watched the videos at AppliancePartsPros to verify what I had to do. Previously, I had noticed the clothes were not completely drying and again I watched another video from AppliancePartsPros. I removed the old components plus the two moisture sensors and installed the new components no problem. i tried to complete the fault checklist that came with the high temp cutoff and the thermostat, but I didn't know most of the points it asked about. I did clean the lint as well as I could, especially the hose leading outside. The dryer seems to be working like new. I am happy. 

Replaced coils. 

Figured it was the heating element, but had never been inside this dryer before. Took off the back panel and top, which was easy, but later determined the back was the only panel that could stay in place. Oops. Could see the heating element near the bottom but drum was in the way to remove it, so did some more googling till I found that the front panels (bottom, door, top electronics) had to come off, the drum had to come out and THEN I could remove the heater box with the element in it. Did a bunch of lint clean up in dryer and inside the vent. Needed it bad. Then replaced the heating element, the gasket on the blower vent (part of door assembly, front and rear halves split apart and a cheap foam gasket must be replaced upon re installation), and buttoned it up. Looking back on it, I could have simply removed the bottom front panel and a few screws on the heater box, allowing the element to slide out towards the front. Would have taken 30 minutes total instead of three hours, but I learnxed all about this dryer now, if it ever needs another part. They are pretty simple machines. 

I watched the repair video at apliancepartspros, ordered the parts and the repair took 15 minutes. My repair was exactly what the video explained. It was a piece of cake!!!! 

I followed the diagnosis in the manual, determined that the problem was the moisture bars, ordered and installed the two bars and the dryer is now operating correctly. 

Replaced moisture sensor bars and dryer thermistor. 

Replaced both.