Trane heat pump fan problem


  #1  
Old 09-24-07, 10:05 PM
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Trane heat pump fan problem

Hi,
Have a 2 year heat pump with a service contract. About 6 months after we got this it started to make a bang.
The guys have been out for the past two years for annual service. I've told them about the bang they even heard it.
They just look at it and give this look like it's normal.
I never had heat pump before but been around some other makes and never have I heard a bang on shutting down the outside fan.
So i'll ask the experts is this normal ?

Jeff
 
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Old 09-25-07, 05:39 AM
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Without hearing it I would say no it's not normal. The guys doing your annual maintenance are not always techs. They are a lot of times newer guys getting into the trade. I would suggest that you call the owner and set up a visit with a tech to check it out.
 
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Old 09-25-07, 08:02 AM
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If you where to hit the top of the heat pump with a hammer
it would sound the same. I know its the flex of the metal as you can see the bend when it's running and the spring back up when it shuts down. It's enough to wake you up if your outside.
 
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Old 09-25-07, 11:27 AM
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Wink

Is the filter clean the coil clean?????? Is it in the unit or the duct ????
 
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Old 09-25-07, 03:50 PM
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The filters are clean.
Coils are fine. It's the outside heat pump fan where the bang comes from.
 
  #6  
Old 09-25-07, 06:59 PM
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I went back out and took a good look at the fan as it was running. When it did shut down it banged but I'm really not sure anymore if it's coming from the fan or something below the fan.
Due to looking through the blades it's hard to tell.
I hope you guys can help as I need Amo when they come back out.
 
  #7  
Old 09-26-07, 12:56 PM
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Originally Posted by JeffLG1 View Post
I went back out and took a good look at the fan as it was running. When it did shut down it banged but I'm really not sure anymore if it's coming from the fan or something below the fan.
Due to looking through the blades it's hard to tell.
I hope you guys can help as I need Amo when they come back out.

the internal mechanism of the compressor is often hung on springs inside the compressor shell. If one of those springs breaks, the compressor would make a loud banging noise when shutting down. maybe this is what you're hearing? I've seen compressors continue to run for years in thsi condition, however the banging could also break something internally.
 
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Old 09-26-07, 08:17 PM
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Compressor spring, Is this something they can check at the house or off to the shop?
 
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Old 09-27-07, 04:08 PM
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I spoke to there lead tech today.
There are two different types of compressor for my unit one which has the springs and another one I can’t remember the name of it sounded like sprang anyhow he said this one will make noise on shut down. They’re coming out next week.
Thanks for the help.
 
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Old 09-27-07, 04:51 PM
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Originally Posted by JeffLG1 View Post
I spoke to there lead tech today.
There are two different types of compressor for my unit one which has the springs and another one I can’t remember the name of it sounded like sprang anyhow he said this one will make noise on shut down. They’re coming out next week.
Thanks for the help.

he might be talking about a scroll compressor that is backspinning on shutdown. most newer scrolls have a check valve feature to prevent that.
 

Last edited by daddyjohn; 09-27-07 at 04:52 PM. Reason: spelling correction
  #11  
Old 09-27-07, 05:10 PM
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Yes, That's it. When you say newer like what year?
Ours was installed late 2005 I know this model has been replaced in 2006.

Would it sound like hitting the top of the unit with a hammer?
 
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Old 09-28-07, 01:26 PM
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Originally Posted by JeffLG1 View Post
Yes, That's it. When you say newer like what year?
Ours was installed late 2005 I know this model has been replaced in 2006.

Would it sound like hitting the top of the unit with a hammer?

yours should be new enough to have an anti-backspin feature. the problem was years ago [decade or so] my suggestion is you have it looked at by a real technician
 
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Old 09-28-07, 03:12 PM
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Thanks for all the help, At least now I have some Amo just in case I get that far out look.
 
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Old 10-03-07, 07:01 PM
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Hi,
The Serviceman came out today.He thinks the problem is the fan motors shaft. The shaft has about 1/4"play (in and out) going from the motor towards the fan blades. He order a new motor.
thanks for your help.

Jeff
 
  #15  
Old 10-04-07, 01:14 PM
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Originally Posted by JeffLG1 View Post
Hi,
The Serviceman came out today.He thinks the problem is the fan motors shaft. The shaft has about 1/4"play (in and out) going from the motor towards the fan blades. He order a new motor.
thanks for your help.

Jeff
You mean up and down or side to side? He didn't have any universal replacement motors on his truck?
 
  #16  
Old 10-04-07, 05:59 PM
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Yes, Up and down..
nope he said he need to order one including the blade.
 
 

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