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Heat works until thermostat calls for aux heat, then blower shuts off with outside unit still running.

American Standard heat pump. Blower and capacitor recently replaced.

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Some blowers shut off depending on the system. Do you have electric hest strips inside? If not the blower will shut off. The outdoor fan should not be running if in defrost mode. If you have heat strips then you likely have low voltage wiring crossed

Posted on Dec 17, 2016

  • Anonymous Jan 04, 2017

    Thomas - thanks for the info. I tested the low voltage wiring as you suggested. It was fine, but testing that revealed that 1 of the 2 thermostats was only sending the command for aux heat and not including the command for heat and blower. Replaced thermostat and it works fine.

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American Standard Freedom 80 single stage fires up... runs and blows heat for a few minutes then shuts off but then 5 minutes later it repeats the cycle. Any ideas? I have replaced the filter.


A 5 min run time tells me that it is overheating. Probably a dirty evaporator coil, or a loss of airflow due to blower issues. Or even a high temp safety that is opening prematurely? Tstat is calling for heat so its doing its job. It could be overheating or a fault at any of the components in the furnace. 90 percent of the time its a dirty blower wheel, EV. coil, or a missing filter that's so dirty its cutting off the airflow. Hope this helps!

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Why does my American Standard heat pump compressor and condenser fan run when I have the thermostat set to emergency heat?


It's possible the "brain" thinks it can still supply some heat. Other wise there is a wiring problem or thermostat switch problem. Installed recently? Never used emergency heat before? What is your emergency heat type, gas or electric? Are you sure they are working. If not the "brain" senses and uses the only source available: heat pump. Thermostat? probably Honeywell? If so call Mfg customer service. Warranty on thermostat or heat pump? If so call customer service. Call your installer.

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What does it mean when the aux is flashing on my thermostat?


I assume that you have a heat pump system. If this is the case, the outside temperature is probably lower than the heat pump is sized for and it is using the auxiliary heating system to keep up. The auxiliary heating system usually is an electric coil in the heat pump unit which supplements the heat being produced by the heat pump. This is normal operations and does not indicate a problem with the heat pump, it is just really cold outside. If it is not colder than usual outside, there may be a problem with the heat pump and you should call a heating contractor to check it out.

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1 Answer

Replaced Thermostat and now Blower Motor will not run


Sounds like a set up issue on the tstat. You say this is a packaged unit, inside the machine you should find where the tstat wires hook up. Typically red is power yellow is compressor orange is reversing valve white is emergency heat green is blower. Put red and green together, test blower. Then red green and yellow, make sure blower works again. If blower runs both ways it's either the tstat wire or tstat itself. Make sure you are landing wires on dedicated heat pump terminals, make sure in settings you are set up for heat pump with back up electric heat and TSTAT CONTROLS THE FAN. Good Luck. Also if there is a switch on the tstat for gas or electric on the back you want electric.

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1 Answer

Bryant heat pump with aux.heat,no blower,outside unit cycles for approx 3 min then shuts down and will repeat cycle in 3-4 min.at no time will blower come on,tried setting fan to manual but no blower.


Chances are you have a bad capacitor or a bad fan motor, maybe a bad thermostat or thermostat connection. Your best bet without knowing what your doing would be to replace the capacitor( it is the part attached to the fan, bottom door, two wires coming out of it, silver). Even this requires some electrical know how. Turn off the power before you touch anything electrical. If that doesn't work then you should definitely call someone. Also a capacitor may be hard for you to buy in person without an account.
Good luck Hope this helps

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1 Answer

I tring to change thermosat I can not remeber what color go where


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

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1 Answer

Trying to figure out thermostat wiring diagham on a split system


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

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I believe the unit you are describing is a heat pump. Heat pump are great when the temperature isn't below 30 With low ambient temps. outside it is much more efficient and comfortable to run aux. electric heat from the heat pump.

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Fan keep,s blowing


Your thermostat is calling for blower, your fan relay is stuck, or that model had a time delay blower solid state board on it which had the blower relay on it, and it could be bad. I would turn the power off to all of your system for a few minutes and see if this could make something happen.

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