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Old 03-16-2014, 01:36 AM   #1
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HVAC Troubleshooting Help


Hi,

Would some input on this issue I'm having. I have a central HVAC and my thermostat sometimes turns off on its own and the vents only blow warm air, no matter what setting the thermostat is
turned to. Also, - though I suppose it could be unrelated - I think I should add that a few months ago the motor broke down and was replaced.

If anyone has any ideas what's going on, I'd be grateful to hear them.

Thank you!

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Old 03-16-2014, 04:31 AM   #2
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HVAC Troubleshooting Help


If your thermostat is turning off, then you shouldn't have any air blowing out of the registers.

Depending on your outdoor unit. It may have a safety switch in it that is shutting it off to protect the unit.

What have you checked.

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Old 03-17-2014, 03:23 PM   #3
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HVAC Troubleshooting Help


This is a tenant's unit, so only now after taking a look at it myself am I getting a better handle on the problem.

Cold air does come out of the register, but after a certain period of time (don't know how long) the cold air stops and I'm told hot air comes in it's place. And the thermostat display no longer shows anything at all.

So, it's not that the compressor doesn't work or that fuse is blown. But something is happening intermittently to cause the A/C to stop functioning.

Could it be I just need to change out the thermostat control module on the wall?

Any help hugely appreciated!!
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Old 03-17-2014, 03:27 PM   #4
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Check if its battery operated, and the batteries are getting weak.

Post brand and model number of thermostat and heat pump equipment.
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Old 03-17-2014, 04:15 PM   #5
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Tnx for quick reply. Turns out no batteries to replace so I guess it must be hard-wired.

Thermostat Brand: Carrier
Model TSTATCCPB501 #2360015.

HVAC Brand: Carrier
Model: Weathermaker 8000

Any ideas what I should be checking next?
Could it be a logic/mother board issue?
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Old 03-17-2014, 05:04 PM   #6
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Check air filter. I believe when that model furnace trips its high limit. It stops putting out 24 volts to the R terminal, which is what powers the thermostat.
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Old 03-17-2014, 05:28 PM   #7
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Just checked filter. Installed 9/13 and looks pretty clean. Is it time to dash the DIY dreams?
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Old 03-17-2014, 05:32 PM   #8
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Quote:
Originally Posted by Readytoplumb View Post
Just checked filter. Installed 9/13 and looks pretty clean. Is it time to dash the DIY dreams?
Not really. However, you made need to be there when it does it.

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