This thread has had many solutions for this issue and all have worked for me with some success.
- Simply pushing the mouthpiece toward the LED "x" will usually get the Pax to heat up. Sometimes it will continue heating after I release my thumb and sometimes it goes back to displaying the temp light. The toothpick method to hold the mouthpiece looks like it would work well but I can't say I have tried it.
- Blowing into the mouthpiece has worked at times.
- Removing and reinserting mouthpiece has worked at times.
- One I have been doing lately that I came up with on my own is when this issue comes up, I press the mouthpiece down but not all the way to clicking into the off position, and then relaxing my thumb to allow the mouthpiece to spring back up. I do this up and down motion a dozen or so times then stop and see if the unit returns to heating without resorting to other fixes listed above. More often than not, this resolves my temp light issue for several days. If this does not work anymore I then do...
A complete cleaning. I have had good results doing the following.
- Soaking the entire mouthpiece in ISO and scrubbing the tube and baffle with a small dental brush and a pipe cleaner. I then rinse with water and dry well. I then use some ISO (carefully) on a small dental brush and scrub around the top of the spring and the top of the oven tube. I then dry this area with a dry pipe cleaner.
- I put a drop of mouthpiece lube (propylene glycol) on the outside of the mouthpiece tube and a drop just inside the tube on the bottom. I then spread it around with another dental brush used ONLY for this procedure.
- I then put the mouthpiece back into the unit and do the "thumb spring" motion up and down at least 20 times. The same way I described in #4 above.
- Since propylene glycol is a solvent, I remove the mouthpiece from the unit and do a repeat of all of the above again. The second time I skip the water rinse and dry all parts I cleaned with a paper towel or dry pipe cleaner (around the spring and oven tube).
- I then repeat step 2 and 3 and call it good.
After a thorough cleaning mentioned above, my Pax will usually not give me any "temp light" issues for several days. When it starts happening again, I go back to step 4 in the first list and do that until its time for another complete cleaning.
Keep in mind that I use my Pax often, and I use BHO's in every oven I load. This means that people that don't use their Pax as often, or like I do, may have these steps last much longer than a couple days.
Hope my post gave you some new things to try for your issue..