Ask Experts Questions for FREE Help !
Ask
    markrkinzel's Avatar
    markrkinzel Posts: 13, Reputation: 1
    New Member
    		  
    #1

    Apr 27, 2009, 09:01 AM
    Fan doesn't work in on position or on cool
    The inside blower doesn't work if I set the fan switch to the on position or if I turn the air on.it works great with the heat
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
    Ultra Member
    		  
    #2

    Apr 27, 2009, 09:23 AM

    I suspect the "fan switch" in the thermostat (that's where you try to turn it on, right?) isn't working. It works with heat because a thermal switch kicks in and turns it on.

    I believe you need a new thermostat. You can check this out by removing the cover or outer body of the thermostat to get access to where the wires are attached. For complete directions, you'd have to do this and tell me what you see. You can do this yourself if you have confidence in your abilities.

    This page shows color codes for most common thermostats:
    thermostat wiring color codes

    One wire powers the fan. According to the above page, it's a green or sometimes a gray wire.

    You need to determine which lug provides 24volts (hopefully your system is 24 volts). I would prefer that you use a voltmeter to make this determination. You take a wire and touch one end to the fan output (green wire) and one end to the 24 volts. If the fan comes on, you know that the switch in the thermostat is "toast" and it's time to replace the thermostat.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #3

    Apr 27, 2009, 09:27 AM

    Connect R to G

    If there is no R, connect Rc to G

    Fan should come on. If it does, then the tstat is bad.

    With the confusing codes: (Rc and R) or (Rc and Rh) may be found jumped on the tstat.
    markrkinzel's Avatar
    markrkinzel Posts: 13, Reputation: 1
    New Member
    		  
    #4

    Apr 27, 2009, 02:13 PM

    I put a jumper between the green and red but didn't get any results
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
    Ultra Member
    		  
    #5

    Apr 27, 2009, 02:29 PM
    Bad information - deleted.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #6

    Apr 27, 2009, 02:32 PM
    Quote Originally Posted by Perito View Post
    Looks like you need a new thermostat. There are some nice ones out there. Consider an automatic setback thermostat. I got one that handles both heating and cooling -- you don't have to switch between the two.
    Perito:

    I don't think so. The problem is at the furnace or the wiring to the furnace.
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
    Ultra Member
    		  
    #7

    Apr 27, 2009, 02:37 PM

    Oops. You're absolutely correct. I think I was asleep at the switch, there. As KeepItSimpleStupid noted, since the fan did NOT come on when you bypassed the thermostat, the thermostat is not suspected. You must look elsewhere for a fix to the problem.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Looking for a DATA ENTRY position to work from my home without paying any fee. [ 5 Answers ]

Hello everyone! Does anyone know how can I get a job as data entry from my home? Work from home as a data entry position. I will be very pleased and very happy if anyone can recommend any web-site or phone that I can contact and apply for free as a data entry position. Thanks for your...

Blower would not work on AUTO position just ON position [ 9 Answers ]

I have installed new rooftop unit- electrical heating & cooling- few weeks ago. When I run the cooling everything goes fine (blower and composer) but if I run the heating; heat element will fire up but the blower will not work unless I put the fan on ON position not AUTO position, so, please, I...

Stress or Anxiety due to work position [ 2 Answers ]

Hello, I'm a broker and I used to be on the telephones, however I hated it due to the high stress it entailed so I moved to electronic communication (i.e e-mail). Now because it is getting busy, I will have to get back on the phones at times. I cannot tell you how much anxiety I have when I...

A/C does not cool - fan doesn't seem to work [ 3 Answers ]

Hi Experts, I have an old mechanical thermostatT834C - I'm trying to replace with a programmable Honeywell RTH111. I have only 3 wires: R (Red), Y(Yellow), W(Green) - in my old thermostat. I have connected Rh,Rc(Red), Y(Yellow), W(Green) - in new thermostat. The Rh, Rc are jumpered. There...

View more questions Search