Charts and diagrams are interesting, but they don't answer your question.  NTC thermistors, are inrush protection resistors.  These resistors have a relative higher resistance when cold and a relatively lower resistance when warm/hot.  Their usual purpose is to protect motors and other electronic equipment from damage due to high inrush currents at startup.  Typically, these parts run around 20 ohms when cold, and only a few ohms when hot.  That behavior prevents excessive voltage drop when the inrush is over (a second or so). the part normally runs hot when the equipment is on.  So if the designer were otherwise distracted when specifying the correct part, it will tend to overheat, crack and self-destruct.  Since the part fails open, your equipment is usually saved, but doesn't work until a new part is installed.  Sometimes the part is out in the open and can be desoldered and replaced.  Other times the part is partially potted.  If you can leave pigtails exposed, a new part can be soldered to those pigtails.  Inrush protection is a big subject and needed almost universally.  It is a cost effective solution compared with more expensive relays and current detectors.  Hope that helps.

-Ghost

There are both types I think

take a blower motor on a ecm electrical commentated motor. In the housing end where the blower has its power and control module there is a thermistor soldered onto the board. It is there to do ? I don’t know but overload at lower startup speeds makes sense. 
and when we encounter NTC on appliances the thermistor is used as a sensor. 
so I may not understand the way a ecm blower works in reguards to a thermistor. But it would make sense that that thermistor could protect da motor or the electronics in its board. Is this true? Or am I needing to understand more?

I understand this from Scotts lessons and agree with it 

There is a part on the "brain end" of a electrically communicated motor used in higher end furnaces, that there is a part on that board that is referred to as a thermistor. It has 2 soldered connection points on the motor board. 

grayfurnaceman.com/the-ecm-motor.html

http://www.grayfurnaceman.com/the-ecm-motor.html

There is a thermistor used in this some ecm design mounted on board. Now I dont know if its a thermistor or not but I understand somewhat limited it is referred to as a thermistor. It does heatup. And from the definition given in wickapida the thermistor can act as a fuse with reseting ability  I E when the resistance is so great from heat it is blocking electrons. Once the load is allowed to cool it will be inrange of allowing electron flow. Thus resetting the fuse application. 

From Wikipedia:

"A thermistor is a type of resistor whose resistance is strongly dependent on temperature, more so than in standard resistors. The word is a combination of thermal and resistor. Thermistors are widely used as inrush current limiters, temperature sensors (negative temperature coefficient or NTC type typically), self-resetting overcurrent protectors, and self-regulating heating elements (positive temperature coefficient or PTC type typically). An operational temperature range of a thermistor is dependent on the probe type and is typically between −100 ⁰C and 300 ⁰C (−148 °F and 572 °F)".

a general definition +¹Qq q

I'm not missing or misslabeling the part? I'm only calling it what the people that I have dealt with call it.

Oh I see now. The motor ecm type use a ptc so as they heatup the resistance increases. I'm sorry I'm so thick headed.  The thermistor general definition needs scotts charts to explaine the difference and also will show the major difference

Hit me in the head and call me golfball.

So in a heating application using an ntc the resistance is decreasing and a board is seeing the lesser resistance and will decide to cut off power to the heater?  Is this deduction correct?

Ok the webinar I will try to find

on a related matter I’m wondering if I need a hz meter to check the water fill on washers that use this technology. What meter do you recommend? Approx cost? I was thinking about getting just a cheap hz meter but I have no idea on connecting or if I have a need of something better. If I followed you correctly in the washer advanced troubleshooting lesson we are looking for a difference in the cycles. If I start out with 60 hz (I’m assuming 60 is the starting point) then read the hz as it’s filling I should be loosing hz? Is hz connected to the meter just like volts? Black - red + ? If polarity is reversed does it have an effect?

On 2/12/2022 at 5:23 PM, Far field said:

Ok the webinar I will try to find

on a related matter I’m wondering if I need a hz meter to check the water fill on washers that use this technology. What meter do you recommend? Approx cost? I was thinking about getting just a cheap hz meter but I have no idea on connecting or if I have a need of something better. If I followed you correctly in the washer advanced troubleshooting lesson we are looking for a difference in the cycles. If I start out with 60 hz (I’m assuming 60 is the starting point) then read the hz as it’s filling I should be loosing hz? Is hz connected to the meter just like volts? Black - red + ? If polarity is reversed does it have an effect?

The webinar is posted in this very blog post, no need to go searching for it. 😅