Blower Fan Runs Constantly - HVAC - Page 5 - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 11-23-2011, 01:50 PM   #61
I'm Your Huckleberry
 
Join Date: Mar 2011
Posts: 5,884
Rewards Points: 2,220
Default

Blower fan runs constantly


Quote:
Originally Posted by wmm View Post
That is what I thought too. I changed that first, sorry...I forgot to mention that.

This morning it has worked properly a couple of times and a few times it did the false start.

I should get the new board this Sat or Monday. Probably will not have much time to troubleshoot as I have to leave town for work.

Thanks for the speedy response.
Ww

I was under the impression that you had already installed the new board. Yup, it's a control problem, so either the board or the stat is telling the furnace to come on and shut off.

You can bypass the stat, completely removing it from circuit, and control the furnace at the board and see if the problem persists. I'd be willing to bet it does and that the board is the problem.

Let us know and we'll walk you through how to do it.

Advertisement

Doc Holliday is offline   Reply With Quote
Old 11-29-2011, 01:52 PM   #62
wmm
Newbie
 
Join Date: Nov 2011
Posts: 13
Rewards Points: 10
Default

Blower fan runs constantly


Ok, board installed. Applied power at breaker box, then turned on switch on side of furnace and as soon as I did that a relay threw a quick spark. The thermostat was off.

The relay is the one on the left in the picture. This is a picture of the old AMF one, the new one is a Potter Brumfield one. The relay on the board is labeled CRF. Two things...I don't know if I'm using proper terms here...I think it is a relay and I don't know what CRF stands for.

The fan will only turn on with the Thermostat in the ON position. In Auto, the burner lights, but no fan.

Ideas? seems to be similar to the old board.

Thanks
Attached Thumbnails
Blower fan runs constantly-imag0001.jpg  
wmm is offline   Reply With Quote
Old 11-30-2011, 01:14 PM   #63
wmm
Newbie
 
Join Date: Nov 2011
Posts: 13
Rewards Points: 10
Default

Blower fan runs constantly


Could the board be shorting out some how within the bracket holding it? I also noticed the pilot light seems to be a little longer...maybe 3 or 4 inches, could this have any affect on the running of the fan? thanks for the help, I wish i could get the auto mode working...don't like the fan running all the time.

Bill
wmm is offline   Reply With Quote
Old 12-06-2011, 06:52 AM   #64
Newbie
 
Join Date: Dec 2011
Location: hendersonville tenn
Posts: 4
Rewards Points: 10
Unhappy

Blower fan runs constantly


i have an electric furnace and the blower stays on i put a new relay in NO GOOD i put two new limit switches in NO GOOD THERE is a stack that i havent replaced.PLEASE HELP:whistlin g2: it says coleman on the door but MORT EX on the blower 1988 trailer furnace

Last edited by small; 12-06-2011 at 06:55 AM. Reason: word
small is offline   Reply With Quote
Old 12-06-2011, 07:20 AM   #65
wmm
Newbie
 
Join Date: Nov 2011
Posts: 13
Rewards Points: 10
Default

Blower fan runs constantly


Search for ” when blower comes on gas shuts off”

I ended up replacing the entire circuit board, which was not difficult. I did not have the ability to replace a relay individually. This fixed everything for me.

Good luck
wmm is offline   Reply With Quote
Old 12-06-2011, 07:57 AM   #66
Newbie
 
Join Date: Dec 2011
Location: hendersonville tenn
Posts: 4
Rewards Points: 10
Default

Blower fan runs constantly


i feel the same way YOU DONT HAVE TO BE RUDE to help some one .CAUSE i have the same problem and too need help PENNY TENNESSE

Advertisement

small is offline   Reply With Quote
Reply


Thread Tools
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
blower runs, with no heat captjack HVAC 6 12-14-2010 03:15 PM
furnace blower constantly running HELP! ice_wolf69 HVAC 16 10-26-2008 07:11 PM
Trane Carrier XL80 fan runs constantly when switch is on jheavner HVAC 13 10-25-2008 10:54 PM
RUUD furnace not working blower runs ddeatrick99@hotmail.com HVAC 2 01-16-2008 10:55 PM
Blower fan runs continuously mgeller HVAC 5 04-19-2007 10:27 PM




Top of Page | View New Posts