Fan won't turn off

[V0RT3X]

MMM

Plug everything it, flip the switch, all the usual beeps but the fan will not stop. Always spins, even if I start it the next day. Thought it was getting hot but I don't think that's the case, 6S 5000 30C with 1520 geared for 38-40mph. (Flux XL)

Not that it's a big deal but can something be dead inside? (like the thermal sensor)

Temps on motor after hard run were 50°C and the ESC about the same(at the motor bullets), lipos were 30°C max.

[What's_nitro?]

Reload the firmware?

[V0RT3X]

Done, still the same. I reloaded the 1.21 firmware.

[What's_nitro?]

Yup. Must be a component defect then. It's not really a bad thing that the fan runs all the time. Maybe a bit annoying, but not bad...

[rtoc]

Mine does the same thing. I purchased the MMM about a month and a half ago from Tower. Called CC and they told me it's most likely a hardware problem because updating the firmware didn't do anything. They described it as something along the lines of a "thermal resistor failure." They assured it me it's nothing to worry about, but who knows.

[suicideneil]

So long as it is just that component thats failed, then theres nothing to worry about- constantly spinning fan is a good thing in my book, I kinda prefer it that way.

[squeeforever]

Not really sure, but the only problem I would worry about is if that same thermal resistor controlled the thermal shutoff. In the event it got extremely hot for some reason, it wouldn't shut itself off. Like I said, I'm not sure if Castle uses one for the fan and another one for the thermal shutoff, or one for both.

[sikeston34m]

Originally Posted by squeeforever

Not really sure, but the only problem I would worry about is if that same thermal resistor controlled the thermal shutoff. In the event it got extremely hot for some reason, it wouldn't shut itself off. Like I said, I'm not sure if Castle uses one for the fan and another one for the thermal shutoff, or one for both.

Hi Squee,

How've you been doing? Long time no see.

I'm pretty sure there are two thermistors involved since the fan comes on at one temp and thermal shutdown occurs at another temp.

Two setpoints would require two thermistors.

[BrianG]

...unless one thermistor controls both circuits. Thermistor's resistance varies with temperature (not on/off), and so the monitoring circuit could be watching for different resistance values.

[simplechamp]

If it was one component controlling both functions it would be a problem if it failed, but since Castle told him it's nothing to worry about I think we can assume it's two separate components.

[Jahay]

castle should offer function where you can have it on at all times!!!
just have your temp gun at all times and check frequently...

[Kcaz25]

Originally Posted by Jahay

castle should offer function where you can have it on at all times!!!

Agreed!

[danielc79]

it would definately affect the longevity of the fan if it was constantly running. not sure if it would matter as in my experience the fan would outlast the esc nearly always, but it could be an issue.

[Pdelcast]

Originally Posted by Jahay

castle should offer function where you can have it on at all times!!!
just have your temp gun at all times and check frequently...

Even better--- Castle should offer a programmable fan "on" temperature. That would be cool. This way, you could adjust the temp where the fan comes on up or down depending on how abusive your setup was.

[BrianG]

Hey Patrick, while you're on here, do the "fan on" and "thermal shutdown" functions operate on the same thermal sensor? Just curious...