Auto works but Thermostat fan "on" does not - Appliance Repair Forum

Welcome Guest! You can not login or register.

Notification

Error

Auto works but Thermostat fan "on" does not Options Email this topic Watch this topic Print this topic » Normal Threaded
Model: TRANE XE80	Brand: -other-	Age: More than 10 years
Previous Topic Next Topic

officework13		#1 Posted : Monday, March 10, 2014 11:43:35 AM(UTC)
Rank: Member Groups: Registered Joined: 3/15/2011(UTC) Posts: 14		i have a trane xe80 furnace about 13 years old. air conditioner installed about 8 years ago. programmable thermostat - also 13 years old Everything works good EXCEPT. when i turn the thermostat to 'ON' from auto nothing happens. (i.e. the fan does not run) i want to leave the fan on all the time to circulate the air. at one time the fan "on" worked, and it also worked after i had the AC installed as well. perhaps the thermostat is shot. any pointers on testing this. i have some electrical skills and understand most principles and know how to use a volt meter and that it is not a good idea to stick a knife into an electrical socket.


User Profile View All Posts by User View Thanks

Sponsor

See inside of your appliance - diagrams and part photos for virtually every model.

officework13		#2 Posted : Tuesday, March 11, 2014 12:59:07 PM(UTC)
Rank: Member Groups: Registered Joined: 3/15/2011(UTC) Posts: 14		see attached picture OK, so i looked at the wiring and think i know what is likely wrong. 4 wires go to the thermostat. Red to R Green to G Purple to Y Black to W with thermostat on auto i have 24 Vac from red on thermostat to each of the 3 wires, turn thermostat from Auto to on and voltages to green drop to near zero. checked out furnace wiring. there are 3 sets of wires as follows Wire 1 - to thermostat Red to R, Black to W, Purple to Y, Green - taped off (not used). Wire 2 - to air conditioner Black to Y, Red to C Wire 3 - to exhaust fan Black to R, Red to G So how this is set up from my understanding is that the fan kicks in when we turn on the exhaust fan. However, i want to be able to turn on the blower fan without turning on the exhaust fan. in winter i am loosing heat by doing this, and in summer i am loosing cool air. my question, can i hook up the green wire (from the thermostat) to the circuit board (G) so i can use the thermostat to run the blower without turning on the exhaust fan. officework13 attached the following image(s):


User Profile View All Posts by User View Thanks

Users browsing this topic
Guest (2)

Forum Jump

You can post new topics in this forum.
You can reply to topics in this forum.
You can delete your posts in this forum.
You can edit your posts in this forum.
You cannot create polls in this forum.
You can vote in polls in this forum.

Important Information: The AppliancePartsPros.com uses cookies. By continuing to browse this site, you are agreeing to our use of cookies. More Details Close