HVAC Blower not working, troubleshooting Fan Control board

IF YOU FIND THIS VIDEO USEFUL * please* feel free to make a donation!
Donation link: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=LNKJ...
take the time to visit my sponsors (advertisements)!
REMEMBER: This video is intended for technicians and those going to school for hvac, leave testing and repair to the professionals!
A quick easy way to trouble shoot most fan control boards to determine if the blower motor is working or if it is the control board

Category:

Education

Tags:

• blower
• motor
• fan
• control
• board
• hvac
• not
• working
• troubleshooting
• no
• air
• airflow

[oneadvent]

Hey I watched your video twice, and did what you said to do, and my fan kicked on! I noticed a blown fuse so I'm going to try and replace it first, but in the mean time, can I replace the heater wire instead of the cooling wire to the switch? It's winter now!

[mikie2501]

@oneadvent No! You can't bypass the control board in heat mode, especially gas. There are numerous safeties on the board to protect you and the system from fire hazards. In Cool mode it's not a big deal to do it till you get parts since the only thing the board does in cool mode is turn on the blower. In heat mode it's a whole different ballgame. Just leave it shut off until a technician can get you a replacement installed :)

[mikie2501]

@oneadvent I sent you a message on your youtube page with my number, give me a call today. (sunday)  Michael

[madamfreak]

i blew a fuse on circuit board...before this the led was blinking 3 times now i have two green leds and one yellow but blower motor still wont come on...circuit board for this rheem furnace are over 200 dollars off line...i found one for 145 online....i jumpered out the limit switch and still nothing

[mikie2501]

@madamfreak Check to see if there is a sticker on the unit showing what the blink codes mean, otherwise I can't help with that off the top of my head. Usually a blow fuse on the board is due to a short in the low voltage wiring. Check for rodent chewed low voltage wiring, weed eater or dog chewed wiring outside, etc. ...really hard to trouble shoot most things like this without actually being there. If it isn't something simple like damaged wiring it's best to hire a professional to fix .

[tallentedfab]

Hookin the blower up to the door switch is a stupid way to activate the blower! Most customers are not going to want the blower going non stop and add extra money to the electriv bill, u should wire the blower to a relay with a 24v coil hook up 115v to one side the hi speed to the other and hook the 24v coil side to the R and G on the board. So when your callin for cooling the 24v will active the coil and turn the blower on.

[TheRoadkill3]

Learn the sequence of operations, other wise ur just pissin in the wind cause u may have not had to take the board out. The problem could ha rest with the fan relay or the fan itself

[Santrial]

This video was a big help! if we have more problems or anythin again, we'll look you up :)

[MrGurudude5]

on this board can you tell me where to test for power in to make sure my fan control board is not bad. i have the same board in this video. i need to test for power coming in cause i have no diag light need to check to see if its the power switch or the board or the transformer can anyone help me on this thanks in advance!

[MrGurudude5]

i have the same board in my trane xb80 the diad light is off and nothing is working nothing. can you tell me how to test for the issue please!!!

[oneadvent]

@mikie2501 hahaha sorry I watched one of your other videos and you said "I cannot say it enough, do not bypass for heat" so I didn't. I noticed that the fuse is blown on the board, so I think that is what is wrong, and before it went bad there was a pretty loud sound from it, like a jet engine. I was going to replace the fuse and see what happens. Someone suggested that it may be some ball berrings or something, but it sounds fine when bypassed in cool mode. My fuse is 5 A, rated up to 32V