Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-03-2009, 10:46 PM   #1
Member
 
Join Date: Apr 2009
Location: Vancouver B.C., Canada
Posts: 37
Share |
Default

blower won't shut off on new gas furnace


I can't figure this out. I have a 2year old gas furnace. The blower won't turn off and I can't find a switch on the furnace like my old one had that can keep the blower always on or off. The only switch is for the lower cover that shuts it off. I am not familiar with this furnace because it is a house that I rent to tenants. I tried an old school t stat and a new digital one with the same results. There are only 2 wires coming from the circuit board right now. The only time it shut off was when I raised the heat and then it turned on again and stayed on. The heat works fine. Is there a switch that I am not seeing on the furnace?

johnny67 is offline   Reply With Quote
Old 09-03-2009, 10:53 PM   #2
GC/Master Plumber/Mech
 
Join Date: Feb 2009
Location: Hays, KS
Posts: 1,470
Default

blower won't shut off on new gas furnace


How many wire are connected at the thermostat?

Also post brand and model of furnace

__________________
John Wayne once said "Life is tough and it is even tougher if you are stupid"

Tempstar and Trane Dealer
Plumber101 is offline   Reply With Quote
Old 09-03-2009, 11:01 PM   #3
Member
 
Join Date: Apr 2009
Location: Vancouver B.C., Canada
Posts: 37
Default

blower won't shut off on new gas furnace


2 wires at the t stat. I am not sure what model it is because I am not at the house but if this helps it is a 80+ AFUE upflow/horizontal furnace with no A/C.
johnny67 is offline   Reply With Quote
Old 09-03-2009, 11:03 PM   #4
GC/Master Plumber/Mech
 
Join Date: Feb 2009
Location: Hays, KS
Posts: 1,470
Default

blower won't shut off on new gas furnace


Where is the furnace installed? Basement, attic...where?
__________________
John Wayne once said "Life is tough and it is even tougher if you are stupid"

Tempstar and Trane Dealer
Plumber101 is offline   Reply With Quote
Old 09-04-2009, 04:35 AM   #5
Member
 
Join Date: Apr 2009
Location: Vancouver B.C., Canada
Posts: 37
Default

blower won't shut off on new gas furnace


It is in the basement.
johnny67 is offline   Reply With Quote
Old 09-04-2009, 05:10 AM   #6
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,791
Default

blower won't shut off on new gas furnace


Probably has a dirty/plugged air filter. And the limit switch tripped when they ran it for heat on a cool night.
beenthere is offline   Reply With Quote
Old 09-04-2009, 07:17 AM   #7
Member
 
biggles's Avatar
 
Join Date: Jan 2008
Location: Long Island
Posts: 3,627
Default

blower won't shut off on new gas furnace


fan ON limit disc might be closed shut.the FAN during heating cycle is 100% isolated from the stat action or call.the actual heating of the heat exchanger or a time delay on the furnace solid stae board(fan relay) runs fan.it's either that disc or the relay on the board is arced closed...tap the relay on the board with a small screwdriver handle see if it opens.if you have the stat in hand with just the subbase wired looking at it the fan closure to run is in the furnace limiting wiring.when the furnace is called for the HEAT-X gets hot and the supply fan comes ON when the stat is satisfied the gas shuts off and the HEAT-X cools down and that disc should open shutting off the fan.

Last edited by biggles; 09-04-2009 at 07:22 AM.
biggles is online now   Reply With Quote
Old 09-05-2009, 01:35 AM   #8
Member
 
Join Date: Apr 2009
Location: Vancouver B.C., Canada
Posts: 37
Default

blower won't shut off on new gas furnace


The filter was very dirty, I put a new one in now. Is there any other clue you guys can give me to know what to look for when looking for the relay to tap on. I will be at the house tomorrow and I will note the make of the furnace and take a few pics of the electronics board etc.. thanks
johnny67 is offline   Reply With Quote
Old 09-06-2009, 07:09 AM   #9
Member
 
biggles's Avatar
 
Join Date: Jan 2008
Location: Long Island
Posts: 3,627
Default

blower won't shut off on new gas furnace


the relay on a solid state board is about 1" x 1/2" in size even though the stat isn't calling it the contacts might be be swinging open when the control voltage is stopped.
biggles is online now   Reply With Quote
Old 09-06-2009, 05:32 PM   #10
Member
 
Join Date: Apr 2009
Location: Vancouver B.C., Canada
Posts: 37
Default

blower won't shut off on new gas furnace


The furnace is a Nordyne model #FG6RA 072C-12A. I took a picture of the board and I was told by the installer that it is probably due to the clogged filter just like you guys said and that the limit switch needs to be replaced. He said that the part is $25 and he could come down and put it in plus a $100 service call. Is this something a handy guy like me can do. I have experience with electrical work. Or is this something left to a professional? I did tap on a few of the black boxes in the pic but it did not turn the fan off (not sure which one was the relay switch)














Last edited by johnny67; 09-06-2009 at 05:36 PM.
johnny67 is offline   Reply With Quote
Old 09-06-2009, 06:24 PM   #11
Member
 
JohnH1's Avatar
 
Join Date: Jan 2009
Location: Chicago, IL.
Posts: 428
Default

blower won't shut off on new gas furnace


Its not a open limit. You said the heat started and ran fine. If it was a limit the burners would not run. The only thing I could think of is a bad board.
JohnH1 is offline   Reply With Quote
Old 09-06-2009, 06:30 PM   #12
Member
 
Join Date: Apr 2009
Location: Vancouver B.C., Canada
Posts: 37
Default

blower won't shut off on new gas furnace


thats right. When I turn the heat up the fan will shut off for about 10 seconds then it will kick on again with the heat. Although I am not sure if I have let it run the cycle yet since the days around here have been hot, but I can try that tomorrow.
johnny67 is offline   Reply With Quote
Old 09-06-2009, 06:33 PM   #13
Member
 
JohnH1's Avatar
 
Join Date: Jan 2009
Location: Chicago, IL.
Posts: 428
Default

blower won't shut off on new gas furnace


I am also not thrilled with the copper gas line. Gas and copper dont play well together.
JohnH1 is offline   Reply With Quote
Old 09-06-2009, 06:55 PM   #14
GC/Master Plumber/Mech
 
Join Date: Feb 2009
Location: Hays, KS
Posts: 1,470
Default

blower won't shut off on new gas furnace


Check the limits that are on the blue wire. There is one right up front and one that is by the blower. They should be closed circuit. They also had a manual reset. The button in the middle of the connector. Just a thought to see if one has tripped.
__________________
John Wayne once said "Life is tough and it is even tougher if you are stupid"

Tempstar and Trane Dealer
Plumber101 is offline   Reply With Quote
Old 09-06-2009, 07:01 PM   #15
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,791
Default

blower won't shut off on new gas furnace


Quote:
Originally Posted by JohnH1 View Post
I am also not thrilled with the copper gas line. Gas and copper dont play well together.
Natural gas, and copper are fine together.

Its the acid that some of the companies don't remove that is a problem.
Some areas certify their gas to be acid free.

His may be one of those areas.

beenthere is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How much power does a small furnace blower use? Red Squirrel HVAC 10 07-31-2009 09:03 PM
Problems with new furnace..Overheating, having to reset. Furnace too big? Tommy2 HVAC 41 12-01-2008 01:55 PM
Bryant Furnace Blower Running Constantly GhostBuster HVAC 15 11-30-2008 09:08 PM
Newmac furnace blower won't shut off dsgreer HVAC 2 11-03-2008 01:23 PM
Oil furnace won't shut off tef HVAC 3 11-13-2007 08:43 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.