Hi,
I'm trying to find an answer to a question on my earlier post about this clothes dryer moisture sensor situation where the dryer does not run long enough to completely dry the clothes. I've gone trough every suggested cause and still have the same problem. So I'm wondering if you could take a look at the schematic of the dryer circuitry at this site:
https://www.easyapplianceparts.com/...51310&Position=8&mfg=Maytag&Type=Dryer&Mark=8
The "electronic" board in upper area with dotted lines around it, shows the moisture sensor connected with blue wire at pin on lower right corner. I need to make the system more sensitive (having it behave like the sensor still is seeing moisture). Would changing the values of the two 510K resistors make a difference? Or what change could I make to achieve the desired outcome.... no I don't want to create a hazard, just improve on the situation. BTW what is PTC on lower left of the circuit board all about... appears to be adjustable.Thanks very much !

 

Would changing the values of the two 510K resistors make a difference?

I believe it would, as long as the sensor is still doing something. I see no risk in performing an experiment where you bypass one of them completely (by placing a jumper wire across it). This might make your dryer run longer, perhaps forever, so keep an eye on it. It may take quite a lot of futzing to arrive at the right value, though. And if the sensor is completely kaput, nothing you do with the resistors can fix that.

 

PTC means Positive Temperature Coefficient. In other words, resistance increases as temperature rises.

 

Another thing you might try is running the dryer with the moisture-sensing bars shorted, maybe with a piece of foil or a jumper on the backside. If the problem persists, then it's not the sensor.

 

Thanks for the tips... yes it is likely that jumpering the moisture detector terminals would cause it
to run continually.

 

Hi,
I'm trying to find an answer to a question on my earlier post about this clothes dryer moisture sensor situation where the dryer does not run long enough to completely dry the clothes. I've gone trough every suggested cause and still have the same problem. So I'm wondering if you could take a look at the schematic of the dryer circuitry at this site:
https://www.easyapplianceparts.com/...51310&Position=8&mfg=Maytag&Type=Dryer&Mark=8
The "electronic" board in upper area with dotted lines around it, shows the moisture sensor connected with blue wire at pin on lower right corner. I need to make the system more sensitive (having it behave like the sensor still is seeing moisture). Would changing the values of the two 510K resistors make a difference? Or what change could I make to achieve the desired outcome.... no I don't want to create a hazard, just improve on the situation. BTW what is PTC on lower left of the circuit board all about... appears to be adjustable.Thanks very much !

Trying a different tack....consider how it would behave if the internals of the dryer were getting too hot too quickly. The moisture sensor could be fine, but one of the (usually two or three) over temperature breakers could be tripping. That would give you premature shutdown, because it isn't running long enough for the moisture sensor to be the final arbiter of the cycle. And it would work again after a while because the breaker has cooled and reset.

Easy to check. Set the timer to max, and run it with moisture sensor bypassed and see if it stops or runs to timer's end. Test it with a damp load (no sense wasting the electricity!....and because a load simulates the usual operating mode).

Look for airways or vents blocked by fluff (which would cause overheating and a thermal trip).

I'm not saying this analysis is right - just that it is consistent with the observed behaviour, therefore worth investigating or eliminating.