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Old 02-15-2012, 08:37 PM   #1
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furnace blower won't turn on at night.


My old... very old, 32 yrs old rheem furnace will work fine during the day but won't work in the middle of the night. Between two and 8 in the morning there is a buzzing sound like it wants to kick in but the blower doesn't work. In the morning I have to turn the switch on and off and it works all day until the middle of the night. I changed the capacitor since it was reading at 6.5 and same issue. I don't know if having the roof replaced has anything to do with this. I don't know if there is condensation or ice somewhere and that is why it is happening at night. Please help.

Hello again, Thank you for the responses. It is a Rheem rgac-095a highboy furnace. I can understand if the motor heats up and shuts down but when it starts buzzing and I turn the switch off and then try 4 hours later it won't turn on if it is still the middle of the night. Around 8 in the morning I can flip the switch and the motor starts running and works all day. Then at night goes out again.

Ben's Plumbing If it is a thermal overload does that mean I need to replace the motor?


Thank you all. It was my motor and bracket which was riveted and couldn't tighten it. Installed the new motor and got a new bracket and working perfectly thank you.

How: I do have another motor dl1036 but I didn't think that's what it was. Also, no not a euphemism. Didn't think of that.

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Last edited by mariamav3; 02-17-2012 at 04:40 PM. Reason: fixed
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Old 02-15-2012, 08:50 PM   #2
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furnace blower won't turn on at night.


Brand and model Please

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Old 02-16-2012, 02:19 AM   #3
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furnace blower won't turn on at night.


If you measure the power leg and the neutral into that motor and get 120V when the motor is not running and you are getting that buzzing sound, then you will know that the motor has overheated and has shut down.
If your furnace has a board then the turning of the power on & off would reset the unit after the furnace limited out when the motor shut down.

If you've changed the capacitor with one that had the identical rating of the old one then you are probably going to need to change the blower motor.

Last edited by how; 02-16-2012 at 04:40 PM.
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Old 02-16-2012, 04:29 PM   #4
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furnace blower won't turn on at night.


Sound more like fan relay problem to me.See if you can tell if the noise is coming from the motor or the relay and continue from there
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Old 02-16-2012, 06:36 PM   #5
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furnace blower won't turn on at night.


a 32 year old rheem is not going to have a relay on it for the fan, it uses a fan/limit combo. As how said, its probably over heating and shutting down.
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Old 02-16-2012, 07:06 PM   #6
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furnace blower won't turn on at night.


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Originally Posted by mariamav3 View Post
My old... very old, 32 yrs old rheem furnace will work fine during the day but won't work in the middle of the night. Between two and 8 in the morning there is a buzzing sound like it wants to kick in but the blower doesn't work. In the morning I have to turn the switch on and off and it works all day until the middle of the night. I changed the capacitor since it was reading at 6.5 and same issue. I don't know if having the roof replaced has anything to do with this. I don't know if there is condensation or ice somewhere and that is why it is happening at night. Please help.
I really think its time to replace this furnace....just because of its age....
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Old 02-16-2012, 07:12 PM   #7
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furnace blower won't turn on at night.


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I really think its time to replace this furnace....just because of its age....
I have to agree..........
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Old 02-16-2012, 08:00 PM   #8
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furnace blower won't turn on at night.


Hello again, Thank you for the responses. It is a Rheem rgac-095a highboy furnace. I can understand if the motor heats up and shuts down but when it starts buzzing and I turn the switch off and then try 4 hours later it won't turn on if it is still the middle of the night. Around 8 in the morning I can flip the switch and the motor starts running and works all day. Then at night goes out again.
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Old 02-16-2012, 08:51 PM   #9
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furnace blower won't turn on at night.


Quote:
Originally Posted by mariamav3 View Post
Hello again, Thank you for the responses. It is a Rheem rgac-095a highboy furnace. I can understand if the motor heats up and shuts down but when it starts buzzing and I turn the switch off and then try 4 hours later it won't turn on if it is still the middle of the night. Around 8 in the morning I can flip the switch and the motor starts running and works all day. Then at night goes out again.
sounde like it going into thermal overload heats up ....needs 4-5 hrs to cool down before it will restart...thats why it runs in the morning
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Old 02-16-2012, 08:54 PM   #10
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furnace blower won't turn on at night.


Is the motor belt or fan cage stiff to move normally? Is it harder to move them when the motor is buzzing...Change motor.
Warning. A buzzing motor can fire up unexpectantly and make future repairs more awkward with missing fingers.

You can see if the motor is getting 120V when its trying to run but isn't...Change motor.

You can measure the Amps and compare that against the motor plate...if higher than the rating...change motor.

FURNACE BLOWER WON'T TURN ON AT NIGHT
Furnace blower isn't a euphenism for anything else...is it?

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