Author Topic: Help reading wire diagram  (Read 2330 times)

Bruinguy

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Help reading wire diagram
« on: September 16, 2017, 11:25:17 AM »
I've got a range hood that stopped working. I've confirmed that there is power to the plug, but neither the lights or the fan work.  It seems like there should be a limited number of things that would affect both. But, looking at the wire diagram it doesn't seem like there are any components that would impact both the fan and the lights.  Am I reading this right? 



What should I be doing to trouble shoot this? 

Thanks!

Cadman

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Re: Help reading wire diagram
« Reply #1 on: September 16, 2017, 11:42:58 AM »
If that's the correct wiring diagram, you're right, not much can go wrong. If this unit plugs in, you might have a bad line cord, or loose connection in the hood. You could always pull the plug and test for continuity in the cord from each prong to respective hot and neutral connection in the hood. -C

sokoloff

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Re: Help reading wire diagram
« Reply #2 on: September 16, 2017, 12:02:17 PM »
Does the neon lamp light at all?

Bruinguy

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Re: Help reading wire diagram
« Reply #3 on: September 19, 2017, 01:46:34 PM »
Thanks for the feedback.  I'll update on my progress once I get a chance to dig into the project again!

KarefulKactus15

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Re: Help reading wire diagram
« Reply #4 on: September 21, 2017, 04:36:10 PM »
Your right,  not much can go wrong and take down both items...


Either
1.) The power is being lost in the cord, or shortly after it comes into the appliance.   That one BLK connector where 3 wires meets looks suspicious.    Take your meter, set to AC voltage , place black lead on ground and place red lead at that connector, OR at either of the switches L side at the bottom or top.  Should read 110.          WAIT WAIT WAIT... If you know how to safely use a meter you already know this... so im assuming you dont know how, at which point I tell you not to attempt it...  And if you do im not responsible... etc etc...

2.) The neutral path is open... 

I suspect Its one of those 2. They just dont share enough in common for both of them not to work.
« Last Edit: September 21, 2017, 04:38:16 PM by Kroaler »

SoundFuture

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Re: Help reading wire diagram
« Reply #5 on: September 25, 2017, 12:20:37 PM »
Your right,  not much can go wrong and take down both items...


Either
1.) The power is being lost in the cord, or shortly after it comes into the appliance.   That one BLK connector where 3 wires meets looks suspicious.    Take your meter, set to AC voltage , place black lead on ground and place red lead at that connector, OR at either of the switches L side at the bottom or top.  Should read 110.          WAIT WAIT WAIT... If you know how to safely use a meter you already know this... so im assuming you dont know how, at which point I tell you not to attempt it...  And if you do im not responsible... etc etc...

2.) The neutral path is open... 

I suspect Its one of those 2. They just dont share enough in common for both of them not to work.

Second this. It's in the cord or at one of the most common connections.  You can do this with a continuity check without power applied.  Basically make sure it's unplugged and turn your meter to continuity and make sure you have continuity where you expect it to be. Check plug hot to switch inputs, plug hot to thermostat input. Check the neutral return path from the light to the plug and the motor to the plug. If you find you don't have continuity where you expect it to be you can isolate it to a wire, cord, device, or connection point that you can then fix/repace and see if it works correctly (which it likely will as it's highly unlikely multiple things will fail at once).


dycker1978

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Re: Help reading wire diagram
« Reply #6 on: September 25, 2017, 12:40:23 PM »
You probably want to check your thermostat.  The way it is drawn my not be correct.  If the thermostat is out it may remove the line voltage from the other two components.

You should be able to test it with an ohm meter.  Google should tell you what resistance in the thermostat is normal.

Bruinguy

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Re: Help reading wire diagram
« Reply #7 on: September 25, 2017, 01:47:55 PM »
Thanks, all. Got a meter and cracked it open this weekend. Poked around and didn't feel like I did anything. Closed it up...and it worked. Until it didn't, then gave it a couple of bumps with my hand and it worked again. So, I think there is a short in there somewhere, probably by the buttons. Fingers crossed it will work for a bit though.

KarefulKactus15

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Re: Help reading wire diagram
« Reply #8 on: September 25, 2017, 01:58:45 PM »
Sounds like a bad connection.   Not to alarm you, but you should get this fixed.    If it starts doing funny stuff where it dims lights and chokes down then picks back up when you bang it there is some arcing going on, and arcing going on for long enough is a fire hazard (doesn't take very long)

SoundFuture

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Re: Help reading wire diagram
« Reply #9 on: September 25, 2017, 02:15:49 PM »
Sounds like a bad connection.   Not to alarm you, but you should get this fixed.    If it starts doing funny stuff where it dims lights and chokes down then picks back up when you bang it there is some arcing going on, and arcing going on for long enough is a fire hazard (doesn't take very long)

I agree that it would be best to take it out of service until they have time to fix it properly just in case. 

zolotiyeruki

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Re: Help reading wire diagram
« Reply #10 on: September 26, 2017, 07:56:34 AM »
Sounds like a bad connection.   Not to alarm you, but you should get this fixed.    If it starts doing funny stuff where it dims lights and chokes down then picks back up when you bang it there is some arcing going on, and arcing going on for long enough is a fire hazard (doesn't take very long)
+1 to this.  Open it back up, tighten all the connections, and try it again.  Arcing is how electrical fires often start :)

BTDretire

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Re: Help reading wire diagram
« Reply #11 on: September 26, 2017, 02:57:05 PM »
First, unlikely to be a short, probably an Open. (intermitent open)
The question about the neon light was a good one.
I suspect it is off and your open circuit is in the neutral run of the circuit.