Blower motor housing model #900759
I am having to reset the limit switch for the burners to kick on...but now, after resetting, fan motor just hums and does not run.
My assumption is the motor is bad. Good assumption or bad. Thanks in advance.
Craig Smith
blower fan hums and trips limit switch
Hi,
Never reset limits without first repairing the problem, resetting can make them weak and inoperable.
Set t-stat to call for heat and when blower should run, spin the blower wheel in correct direction and see if it starts up and runs.
Could be motor, run capacitor or wiring problem.
Thanks,
Robert
Never reset limits without first repairing the problem, resetting can make them weak and inoperable.
Set t-stat to call for heat and when blower should run, spin the blower wheel in correct direction and see if it starts up and runs.
Could be motor, run capacitor or wiring problem.
Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
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Hi Robert,
Thanks much for the quick reply!
Yes, the motor runs slowly to begin with after I spin the wheel and then spins freely.
Should I try changing out the fan capacitor?
Thanks again.
Craig
Thanks much for the quick reply!
Yes, the motor runs slowly to begin with after I spin the wheel and then spins freely.
Should I try changing out the fan capacitor?
Thanks again.
Craig
Hi Craig,
You would have to replace the run cap any way if the motor is bad. So go ahead and see if that works.
Can give ordering info if needed. Will need same mfd rating and same voltage or higher rating.
Thanks,
Robert
You would have to replace the run cap any way if the motor is bad. So go ahead and see if that works.
Can give ordering info if needed. Will need same mfd rating and same voltage or higher rating.
Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
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Hi Robert,
Hey thanks a bunch! That's kinda what I figured.
I ordered a 10mfd 370VAC from your online parts catalog. I cant' read the rating on the existing run cap but thought the 10mfd would be equal to or higher rated than the exising.
Thanks again. I really appreciate your input.
All the best,
Craig
Hey thanks a bunch! That's kinda what I figured.
I ordered a 10mfd 370VAC from your online parts catalog. I cant' read the rating on the existing run cap but thought the 10mfd would be equal to or higher rated than the exising.
Thanks again. I really appreciate your input.
All the best,
Craig
Hi Craig,
What is your furnace model number ?
Do you have heat only or heat and a/c ?
MFD rating MUST be same, voltage rating can be same or higher.
You can call toll free to 1-877-263-7860 and cancel order until we verify correct run cap.
Thanks,
Robert
What is your furnace model number ?
Do you have heat only or heat and a/c ?
MFD rating MUST be same, voltage rating can be same or higher.
You can call toll free to 1-877-263-7860 and cancel order until we verify correct run cap.
Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
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- Posts: 6
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Hi Robert,
Furnace model number is 7900. Heat and A/C.
My mistake....I thought the mfd rating could be the same or higher not the voltage.
Also, the blower housing is a Nordyne model 900759...if that helps.
Thanks!
Craig
Furnace model number is 7900. Heat and A/C.
My mistake....I thought the mfd rating could be the same or higher not the voltage.
Also, the blower housing is a Nordyne model 900759...if that helps.
Thanks!
Craig
Hi Craig,
Look on furnace facing for data sticker or nameplate to get furnace model number. 7900 is just a series, the model number will be something like 7956-856 .
Need complete model number.
They change p/n's constantly and the furnace model is needed to get new p/n.
Thanks,
Robert
Look on furnace facing for data sticker or nameplate to get furnace model number. 7900 is just a series, the model number will be something like 7956-856 .
Need complete model number.
They change p/n's constantly and the furnace model is needed to get new p/n.
Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
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Hi Robert,
The model number is 7956A856.
BTU input 56,000
BTU output 46,000
BTW I did call the office and ask them to hold the order but I thinked it got shipped anyway. No big deal....we will work it out.
Thanks for all you do!
Craig
The model number is 7956A856.
BTU input 56,000
BTU output 46,000
BTW I did call the office and ask them to hold the order but I thinked it got shipped anyway. No big deal....we will work it out.
Thanks for all you do!
Craig
Hi Craig,
The 10mfd / 370V is correct run cap, so call back tomorrow toll free to 1-877-263-7860
and see if it was shipped. If not, reorder it .
Take care and best wishes,
Robert
The 10mfd / 370V is correct run cap, so call back tomorrow toll free to 1-877-263-7860
and see if it was shipped. If not, reorder it .
Take care and best wishes,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
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Hi Robert,
Hey...great...lucky guess on my part.
I will call to confirm order.
Thanks again for all your help!
Merry Christmas!!
Blessings,
Craig
Hey...great...lucky guess on my part.
I will call to confirm order.
Thanks again for all your help!
Merry Christmas!!
Blessings,
Craig
Hi Craig,
You're very welcome, happy to help. Merry Christmas to you and yours !!
Take care and best wishes,
Robert
You're very welcome, happy to help. Merry Christmas to you and yours !!
Take care and best wishes,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
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