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I have an American Standard m#4tee3f37a1000ac and the fan

Customer Question
Good evening, I have an...
Good evening, I have an American Standard m#4tee3f37a1000ac and the fan motor will not shut off. When placed in ON or circ position it only fans slow. When AC or heat pump kicks on the fan goes to max blow. The fan will shut off when the thermostat is removed.
Submitted: 2 years ago.Category: HVAC
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Answered in 7 hours by:
12/19/2015
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago
gotoman for ac
gotoman for ac, HVAC Technician
Category: HVAC
Satisfied Customers: 5,288
Experience: 51 years of experience install design and repair of all makes and models of AC
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That is a variable speed air handler. Remove G wire on control board at furnace and see if that fan stops. If it does not stop it is module problem. Remove G wire and let me know. I am a Trane dealer and worked for them in Engineering Dept. Russ

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Customer reply replied 2 years ago
Good morning, I removed the green wire and the fan stopped. What part are you referring to as the module. I replaced part #C800796P01 because a small capacitor/diode/small round tubular thing at position C1 had its cap blown off. Background...I recall, #1) with the AC or heat in OFF, when placing the fan motor to ON, , it would come up to full speed. When placed on circ it would have a slow blow. When fan in OFF it did not run at all. #2) When AC or heat is ON, fan would operate the same way. Now the fan is slow blow in CIRC or ON. but comes up to full when AC/heat kicks on. The only thing that changed is we had a service call to replace the condenser fan capacitor. Several months after that service is when I noticed the fan never shutting off. It is usually very load in my garage and one day it was quiet and that is when I noticed the fan running.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

If you remove wire from G on the board and fan stops fan and board OK. Remove wire from thermostat G terminal and see if fan stops.

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Customer reply replied 2 years ago
I need a few minutes to get to it. Thank you for your assistance!
Customer reply replied 2 years ago
I removed the G wire and snapped the thermostat back into place. The fan is not run.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

What thermostat do you. Model number please. Russ

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Customer reply replied 2 years ago
Are you still available? Over the past week I replaced the thermostat with several different models. All had the same result...not shutting off fan.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

Yes still here. If you remove G from thermostat and fan shuts down . Sounds like thermostat. Can you give me model number of thermostat. Russ

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Customer reply replied 2 years ago
American Standard ACONT802AS32DAA, touch screen. when I first noticed the fan running I removed the thermo and the three AAA batteries had significant corrosion. I cleaned and replaced batteries. Of course no change.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

If you know how to get into installer mode on thermostat go to setup 170 option 7. Make sure thermostat is set there. Russ

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Customer reply replied 2 years ago
I do not and I do not have an owners manual. Is there an online source for manuals?
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

Sorry last reply was not yours. Getting lots of Trane and American Standard questions today. You can move unit back around the corner. Just leave room to get to disconnect. Price to move about 300.00 Russ

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HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

Here is manual. Russ

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Customer reply replied 2 years ago
Reviewed install manual plugged in 170 - 7. When I scrolled to that point it was already displayed that way.
Looking at the wiring diagrams, none of the examples match my current wiring to the thermo. See attached photo. Which wiring diagram should I be using based on the A.S. system I have?
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

It is wired correctly. Make sure thermostat is in the off position when you remove G. If Green wire is removed and fan shuts down it is a thermostat problem. Russ

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Customer reply replied 2 years ago
On the furnace block all the Ws (W1, W2, and W3) are jumped together. That is the one wire (white) that is on the left side of the thermo block.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

The W1 w2 w3 are jumpered to bring on all the aux and emergency heat. Did you remove Green from inside G terminal. Russ

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Customer reply replied 2 years ago
Good morning Mr. Gotoman, Yes I removed green from the thermo. The fan stopped. However, when I replaced the thermo (two times with two different new units) the fan continues to run. That is why I thought the issue may be in the wiring.
My goal is to have #1) the fan run on high when set on AUTO and the AC/heat kick on #2) run on high when the fan is set to ON #3) run on low when the fan is set to CIRC #4) not run at all when fan is on AUTO and the AC/heat are not running. does that seem realistic? We like to run the fan in the spring/fall but of course it does not need to run ALL the time. Thanks
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

Should not have any power to G terminal when thermostat is off position and fan is in auto. I have the same thermostat in my house. When you just pull front off thermostat does fan stop. Russ

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Customer reply replied 2 years ago
the fan stops when I pull the thermo.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

In a variable speed the fan will run 50% of high speed in on position. Lets remove one wire at a time on thermostat to see if the fan will shut off. First remove the red wire and put front back on thermostat. Let me know if fan shuts off with red wire removed.

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Customer reply replied 2 years ago
red wire removed, thermo face put back on, fan is not running.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

When you changed thermostat did you change sub base.

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Customer reply replied 2 years ago
completely changed everything when I installed both new thermo's.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

One more thing go to option 650 and 660 set for no extended fan. Russ

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Customer reply replied 2 years ago
Reattached red wire at 650 and 660 time was already at 0 for both settings.Mr. Gotoman, I was hoping to resolve this issue prior to my departure for vacation. Is it possible to connect back with you when I return on the 28th? I will reconnect the red wire to keep the system running while I am out. It is finally getting cold here and I can't shut the system completely off. Please let me know. You have been very helpful and I do not like to leave a project incomplete. We have an extended drive and nee to depart soonest.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

No problem. Get back with me. Russ

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Customer reply replied 2 years ago
Sir, Thank you for your patients and understanding. If you do such, have a Merry Christmas.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

No problem. Russ

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Customer reply replied 2 years ago
Russ, I am following up with a previous troubleshooting forum. I have reviewed the past suggestions. Fan still runs on low speed all the time. I am ready to get this issue resolved. If you have the time, please let me know.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

Did you check the options for extended fan operation

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Customer reply replied 2 years ago
both 650 and 660 are set to "0". you previously provided the service manual and I am pretty familiar with it now.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

There are three settings on your thermostat for fan. Auto,circ,on. If the fan is set to auto and the fan stops when you remove the wire on G terminal. Problem is thermostat. You can leave the green wire disconnected and heat and cool will work fine.

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Customer reply replied 2 years ago
removed green wire, reinstalled thermostat, set a/c to on, a/c kicked on but no fan at all.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

Can you attach photo of terminal board in the air handler please. Russ

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HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

The thermostat controls all functions on air handler. The troubleshooting we have done indicates thermostat problem. When green wire is removed fan stops. If it was module,wiring harness or short in wiring it would keep running. Russ

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Customer reply replied 2 years ago
installed Honeywell RTH8500WF (the closest unit to my old one)
This unit does not have a Circ optionSystem = a/c or heater
system OFF - fan Auto - fan does not run
system OFF - fan On - fan runs slowsystem Heat and not running - fan Auto - fan runs slow
system Heat and not running - fan ON - fan runs slowsystem Heat and running - fan Auto - fan runs full
system Heat and running - fan On - fan runs fullstill cannot get fan to shut off when system is on but not running.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

When fan is running check to see if green light is on at the Zone board. How are the other thermostats in the other Zones set. Russ

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Customer reply replied 2 years ago
I'm not sure what you mean by Zone Board, bit when the system is on Heat and the fan is in Auto or On - the fan green light is on all the time (on the board in the picture 1602 I sent previously). The CFM light flashes 6 times then goes solid for 5 seconds. This the same thing it was doing with the previous thermostat.
HVAC Technician: gotoman for ac, HVAC Technician replied 2 years ago

If you can attach picture of terminal wiring on the air handler. Russ

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