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Old 11-26-2020, 03:13 PM   #1
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Exhaust fan issue

My kitchen roof exhaust fan has been intermittently working for the past couple weeks. Finally it stopped working altogether. Iíve read that the ground thatís provided when the lid is opened can be funky, and thatís the first thing I looked at. But that works fine. It turns out itís this little box to the side of the fan, opposite the power knob.

On this box there is a yellow wire coming in that has 12vdc, as well as two wires that are jumpered together that have 12vdc. The power wire going to the fan is the single white wire leaving the box, and when I jumper 12 volts to it the fan works. Is this little box a relay of some sort? Can I just bypass this box?

In the pic thatís my yellow jumper hanging down.
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Old 11-26-2020, 03:25 PM   #2
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I pulled it down and it looks like it is a relay

Omron TV-8

So I guess my question is when is this relay open to inhibit the fan from working? Like is the fan inhibited while driving down the road?

And can I just bypass it.
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Old 11-26-2020, 04:01 PM   #3
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May have something to do with the hood door being open/closed, cuts power when door is closed?
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Old 11-26-2020, 04:24 PM   #4
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There is a relay in the opposite corner of the fan that has the door wire going through it. But this is for something else.
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Old 11-26-2020, 04:42 PM   #5
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Could it be the feed wire from the temperature control on the wall?

Ie, it sends the signal to the relay to turn on the fan using low voltage and the relay then shunts the connections?

What gets everyone on those fans is that, in my Diplomat, there is a control thermostat on the wall that turns the fan on or off due to ambient temperatures (a nice feature in my mind).

It's the 'third variable' that a lot of people tend to overlook.
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Old 11-26-2020, 05:38 PM   #6
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I’m not sure I have one of the control thermostats on mine. Where is it located in your Diplomat?

Edit: Oh man I feel silly. I found the thermostat. I thought that was for the furnace. Lol. Thanks.
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Old 11-26-2020, 05:40 PM   #7
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Right above the furnace/AC panel. It looks like this (the top one);
Or, the LEFT one since the site turned my picture sideways....
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Old 11-26-2020, 05:51 PM   #8
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Quote:
Originally Posted by JerryLook View Post
Iím not sure I have one of the control thermostats on mine. Where is it located in your Diplomat?

Edit: Oh man I feel silly. I found the thermostat. I thought that was for the furnace. Lol. Thanks.
That's funny! I have a freind that bought a MH, and was complaining that the fan wouldn't work.

I walked over to the thermostat, turned it down, and VOILA! the fan worked!
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Old 11-26-2020, 05:59 PM   #9
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Exactly!
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Old 11-26-2020, 08:29 PM   #10
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I bet if I was in a colder area right now I would have realized that thermostat wasn’t for the furnace real fast

Tomorrow it’s going to be 80 degrees for the high.
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