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 12-27-2012, 09:02 PM   #1
Newbie
 
Join Date: Dec 2012
Posts: 3
Share |
Default

Blown carrier circuit board


I'm new & don't type well so please bear with me , My blower was not working had someone check that wasn't a tech but managed to hot wire motor to see if it worked , it did . so I called someone who service's hot water sys. & he thought it might be the circuit board but he doesn't know much about hvac . So he ordered new board , removed old & old board was burnt behind relay , changed bd. started furnace , still no blower . I switched the button on therm. to fan & the rest is history another $100 circuit bd for the trash . He is suppose to check with someone but I'm wondering if anyone has any thought's . I myself am a machinist & worked in engineering & am capable of using ohm meter's & I use to Drag race professianally & build motors but hvac is new to me . If anyone can point me in the right direction I would deeply appreciate it I can't afford another $100 bill out the window . Thank's

spoke69 is offline   Reply With Quote
Old 12-28-2012, 10:01 AM   #2
Newbie
 
Join Date: Dec 2012
Posts: 3
Default

Blown carrier circuit board


The new cicuit board had a fuse , just wondering why it didn't blow instead of frying the board behind the relay .

spoke69 is offline   Reply With Quote
Old 12-28-2012, 12:42 PM   #3
HVAC Tech/Owner
 
Join Date: Nov 2010
Location: VA
Posts: 435
Default

Blown carrier circuit board


The fuse is low voltage...not the 120 v to your board. What happened to the replacement board? I have a customer today that we hardwired the fan to run while I track down the proper board?
Technow is offline   Reply With Quote
The Following User Says Thank You to Technow For This Useful Post:
spoke69 (12-28-2012)
Old 12-28-2012, 01:44 PM   #4
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,538
Default

Blown carrier circuit board


Good chance the blower motor has a short in its windings. The short may be in the winding for the fan only/cooling speed, but not the speed that your friend used to test the motor.

As above, that is a low voltage fuse, not a line voltage fuse.
beenthere is offline   Reply With Quote
The Following User Says Thank You to beenthere For This Useful Post:
spoke69 (12-28-2012)
Old 12-28-2012, 04:51 PM   #5
Newbie
 
Join Date: Dec 2012
Posts: 3
Default

Blown carrier circuit board


First off thank you for the reply , I have both bds. (1) pn# st9103a1036 Honey well was the orig. from carrier , the repl. bd w/ fuse is pn# hqr99g004 from Acme , both have burnt relay . Thanks for the info on the fuse the Tech @ Acme didn't tell me that . I do know that my friend that is a licensed plumber not Hvac did jump the orig to run the blower , however I didn't pay att. to what wire it was because I don't like someone looking over my shoulder while I work so I did the same for him . besides that he was doing me a favor . I understand the short maybe in the fan "only" circuit but why didn't it come on when the furnace was up to temp ? that was why I switched therm. to Fan only & the fire works began with the new circuit bd ?

Last edited by spoke69; 12-28-2012 at 04:55 PM.
spoke69 is offline   Reply With Quote
Old 12-28-2012, 07:42 PM   #6
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,538
Default

Blown carrier circuit board


Depends on how the motor is shorted. Might be almost a dead short on one speed tap, but not another.

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
goodman circuit board help melissamcclain HVAC 7 08-29-2011 06:20 PM
American Standard/ Trane Air Handler TWg048a140b1 -circuit board ?? gorillames HVAC 2 06-20-2011 10:10 AM
Need Bryant Plus 80 Circuit Board tbzep HVAC 3 12-30-2010 12:14 AM
Obsolete Air Handler Circuit board dvsrikanth HVAC 3 12-03-2010 01:01 PM
Goodman Circuit Board Shot - Can I Jury Rig Fan? ChrisInAtlanta HVAC 2 08-03-2008 02:54 PM




Top of Page | View New Posts

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