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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
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.
What thermostat do you. Model number please. Russ
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
If you know how to get into installer mode on thermostat go to setup 170 option 7. Make sure thermostat is set there. Russ
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
Here is manual. Russ
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
The W1 w2 w3 are jumpered to bring on all the aux and emergency heat. Did you remove Green from inside G terminal. Russ
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
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.
When you changed thermostat did you change sub base.
One more thing go to option 650 and 660 set for no extended fan. Russ
No problem. Get back with me. Russ
No problem. Russ
Did you check the options for extended fan operation
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.
Can you attach photo of terminal board in the air handler please. Russ
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
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
If you can attach picture of terminal wiring on the air handler. Russ