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 > Limit switch trips on Atwood furnace

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LDMontgom

Tennessee

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Posted: 11/07/19 12:19pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the follow up questions.
Yes, it is possiible that I am calling it by the incorrect name. When I look at the wiring diagram I see a component called a Limit Switch. It shows a red wire oming from the Control Board and another red wire that goes to the gas valve area.
I know that it is tripping because I can see it trip and I have to reset it to get anything to work. Again, I could certainly mistake this switch for the Litmit Switch, but this one is definately tripping
Thanks,
Larry

Chris Bryant

Arden, North Carolina

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Posted: 11/07/19 12:35pm Link  |  Quote  |  Print  |  Notify Moderator

What is tripping is a circuit breaker, I suspect. Limit switches are self resetting. It may be bad, or the motor could be drawing too much current.


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LDMontgom

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Posted: 11/07/19 01:35pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks!
The circuit breaker wasn’t tripping until after I replaced the blower motor. It was supposed to be an alternate for the old one. I can short around the circuit breaker, but was hesitant to do so.

pushtoy 2

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Posted: 11/07/19 01:58pm Link  |  Quote  |  Print  |  Notify Moderator

LDMontgom wrote:

Thanks!
The circuit breaker wasn’t tripping until after I replaced the blower motor. It was supposed to be an alternate for the old one. I can short around the circuit breaker, but was hesitant to do so.


DO NOT SHORT AROUND THE CIRCUIT BREAKER you could take out the circuit board..have you checked the new motor for resistence? it could need more amps. to turn faster for more air volume. just guessing without being there.


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Chris Bryant

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Posted: 11/07/19 02:11pm Link  |  Quote  |  Print  |  Notify Moderator

Those do go bad- temporarily, just hook the leads to an act fuse- the breaker should have the value on it, maybe 10 or 15.

LDMontgom

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Posted: 11/07/19 02:39pm Link  |  Quote  |  Print  |  Notify Moderator

I have not checked the resistance on the motor. It will probably be a couple of days before I can due to all the rain we are getting

Dusty R

Charlotte Michigan 48813

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Posted: 11/07/19 05:25pm Link  |  Quote  |  Print  |  Notify Moderator

Look at the name plate on the new motor as to how many amps it draws, and compare it to the old motor.

Dusty

LDMontgom

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Posted: 11/07/19 06:56pm Link  |  Quote  |  Print  |  Notify Moderator

I will.
Thanks

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