Forums | Home Repair | Home Improvement | Painting | Interior Decorating | Remodeling | Landscaping


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 09-12-2009, 11:12 AM   #1
Newbie
 
Join Date: Sep 2009
Posts: 13
Share |
Question

Blower Fan Won't Come On


Yesterday I noticed frost around my outside unit (split uint, furnace piece & blower upstairs). I thought maybe low freon, and read to turn the fan on alone to let it thaw in case the coil were frozen over. I let it do this for about 6 hours. (we left for awhile).

When we got back.. still no go. I noticed at this time no air was coming through the vents. I went upstairs and cracked open my unit, and there was NO ice on the coil left, BUT at this time I noticed the fan wasn't coming on at all.

I looked around on forums and read that you could test the thermostats by connecting the red to the green. Tried that, still no go, so I believe the thermostat is good. The breakers have all been set and reset. Last night while I was holding down the switch manually (wall switch that's closed when you take the side of the fan wall off, I suck at terminology), the unit kicked to life for about 5 seconds (until I let go of the switch to put the plate back on). It wouldn't fire back up again no matter what I did.

This morning I was reading and saw that the "block box with wires out both ends" was the relay and that maybe the issue. I'm not sure. I can hear the relay kick over, but nothing happens at that time. The little black box in mine is labeled transformer. Is that the relay? It gets very warm after the relay has clicked over.

Would it help if I posted a pic of the board? Or perhaps did some multimeter checks?

Thanks in advance!
MichaelKB is offline   Reply With Quote
Old 09-12-2009, 11:36 AM   #2
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 8,330
Default

Blower Fan Won't Come On


Post a pic of the board and the complete make, model and serial # of the furnace.
yuri is offline   Reply With Quote
Old 09-12-2009, 06:40 PM   #3
Newbie
 
Join Date: Sep 2009
Posts: 13
Default

Blower Fan Won't Come On


Some of the pics are kinda big, hopefully it's what's needed!

Make/Model Info:


Board:


Schematic:


The Transformer I was talking about that gets hot when it's on (but still not spinning the fan):
MichaelKB is offline   Reply With Quote
Old 09-12-2009, 10:08 PM   #4
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 8,330
Default

Blower Fan Won't Come On


Check the pink 3 amp fuse on the board to see if it is blown. There is also a capacitor mounted on the fan housing for the motor and it may be faulty. You would need a capacitor tester to check it. Some multi meters can do that function. The relay is built inside the gray control board and the other item is your 24 volt transformer. Does the motor/fan spin easily by hand or is is stiff and seizing up?

Last edited by yuri; 09-12-2009 at 10:13 PM.
yuri is offline   Reply With Quote
Old 09-13-2009, 06:03 PM   #5
Newbie
 
Join Date: Sep 2009
Posts: 13
Default

Blower Fan Won't Come On


The motor turns very easily. And keeps on turning. It seems very well in shape. I took out the cap. and tried to measure with my multimeter, and couldn't get much a reading at all, so I'm thinking it's that. It's only $7 so I'm at least going to try and see if that does it. Thanks for the help!! I'll post my results (nobody is open today.. thank goodness it's cool and rainy out!)
MichaelKB is offline   Reply With Quote
Old 09-13-2009, 07:18 PM   #6
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Default

Blower Fan Won't Come On


How hot does that 'former get?

no skin burn ever at 42C(108F)
burn in 30 sec at 54C(129F)
5 sec at 60C(140F)
1 sec at 71C(160F)

Keep the old cap; there's an easy way to check it with any voltmeter, a 9v battery and a Radio Shack 1 megohm resistor. Also, it wouldn't hurt to check the new one before you put it in.

Last edited by Yoyizit; 09-13-2009 at 07:23 PM.
Yoyizit is offline   Reply With Quote
Old 09-13-2009, 09:00 PM   #7
HVAC / Plumbing
 
Join Date: Feb 2009
Posts: 1,801
Default

Blower Fan Won't Come On


have you checked for power at the blower motor when it was time for it to come on ?? I would do this b-4 I started replacing parts.. Could be bad board
kenmac is offline   Reply With Quote
Old 09-13-2009, 09:52 PM   #8
Member
 
Join Date: Sep 2009
Posts: 78
Default

Blower Fan Won't Come On


Look at the schematic: You see there are four tabs (heat, cool, spare1, and spare2). Remove one of the wires in the park position. Look at the schematic again, right below the hsir box, you will see two tabs (l1 and pr1) remove the wire in the pr1 tab. This will prevent the control board from energizing. Now plug one of the wires that was removed from the spare tab and insert it into the pr1 tab.
Push in the door switch. If the fan runs, you likely have a bad board. Now thats just internet advise. I am not there, and there is a possibility that something may be wrong with the transformer or something else that wasn't seen. But at this point you need to determine if the problem is within the load, or the control.
Flashheatingand is offline   Reply With Quote
Old 09-15-2009, 05:50 PM   #9
Newbie
 
Join Date: Sep 2009
Posts: 13
Default

Blower Fan Won't Come On


Flashheatingand, I'll give that a shot. I bought a new capacitor to give it a shot and it was no go. I still here the relay click but nothing happens.
MichaelKB is offline   Reply With Quote
Old 09-26-2009, 04:12 PM   #10
Newbie
 
Join Date: Sep 2009
Posts: 13
Default

Blower Fan Won't Come On


Thanks for the tip! It's not the blower motor.. it's running right now wired like you suggested for testing. Now I guess I know it's the relay/board?

Quote:
Originally Posted by Flashheatingand View Post
Look at the schematic: You see there are four tabs (heat, cool, spare1, and spare2). Remove one of the wires in the park position. Look at the schematic again, right below the hsir box, you will see two tabs (l1 and pr1) remove the wire in the pr1 tab. This will prevent the control board from energizing. Now plug one of the wires that was removed from the spare tab and insert it into the pr1 tab.
Push in the door switch. If the fan runs, you likely have a bad board. Now thats just internet advise. I am not there, and there is a possibility that something may be wrong with the transformer or something else that wasn't seen. But at this point you need to determine if the problem is within the load, or the control.
MichaelKB is offline   Reply With Quote
Old 09-26-2009, 04:37 PM   #11
Newbie
 
Join Date: Sep 2009
Posts: 13
Default

Blower Fan Won't Come On


I noticed this says direct replacement for a bunch of models, and I found my model number in there (58PAV090). Would this be the part I need to get up and running?
http://www.thecoolingstation.com/ind...roducts_id=117
MichaelKB is offline   Reply With Quote
Old 09-27-2009, 08:24 PM   #12
Member
 
Join Date: Sep 2009
Posts: 78
Default

Blower Fan Won't Come On


Sorry Homey, your going to have to figure that one out on your own...
Flashheatingand is offline   Reply With Quote
Old 09-27-2009, 08:31 PM   #13
Newbie
 
Join Date: Sep 2009
Posts: 13
Default

Blower Fan Won't Come On


lol.. man it's a hot night. I suppose running the spare to both the spot you told me (pr1) and the spot it was resting in would be a bad idea? I'm bout ready to rig it on for some sleep... lol
MichaelKB is offline   Reply With Quote
Old 10-31-2009, 01:42 PM   #14
Newbie
 
Join Date: Sep 2009
Posts: 13
Default

Blower Fan Won't Come On


I opened up my circuit board and took a look. Big black burn spot on my relay. If I can solder, and since it's only $1.30, is there any reason why I shouldn't fix it myself by soldering in the new part as opposed to buying the whole board for $195.00? The part is http://www.mouser.com/ProductDetail/...qY6CWmcjPlU%3D
MichaelKB is offline   Reply With Quote
Old 10-31-2009, 02:06 PM   #15
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Default

Blower Fan Won't Come On


Quote:
Originally Posted by MichaelKB View Post
is there any reason why I shouldn't fix it myself by soldering in the new part as opposed to buying the whole board for $195.00? The part is http://www.mouser.com/ProductDetail/...qY6CWmcjPlU%3D
If your furnace relay really does run on DC you might need a coil transient suppression diode unless it is already in this Mouser relay.
Yoyizit 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
Comfortmaker blower intermittent problem jh44ny HVAC 12 07-31-2011 06:41 PM
Heat comes on but blower never does aczer HVAC 12 02-13-2011 06:57 AM
Acceptable Blower Vibration John_NH HVAC 15 11-21-2010 12:49 PM
AC blower short cycling-works on heat though Steve60007 HVAC 14 06-22-2009 04:00 PM
Blower keeps cycling on and off simonb HVAC 1 01-17-2009 10:56 AM




Top of Page | View New Posts

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