How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Rick Your Own Question
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 21524
Experience:  40+ yrs. experience as a licensed oil & gas technician.
Type Your HVAC Question Here...
Rick is online now
A new question is answered every 9 seconds

I have a dgah077bbsb. with a 120v supply tested ok coming to

Customer Question

I have a coleman dgah077bbsb. with a 120v supply tested ok coming to the board The furnace will not light unless i run a jumper wire to the hot side of the fan. That means that the neutral is ok but I'm guessing that something is not triggering the hot side of the fan to start ignition. Is there a quick te
JA: Did you check the furnace's filters?
Customer: Yes furnace filters are new.
JA: Do you plan on doing the work yourself?
Customer: Cost wise yes
JA: Anything else we should know to help you best?
Customer: The furnace seemed to operate perfectly fine at the end of last season and hasn't been attempted until now.
Submitted: 10 months ago.
Category: HVAC
Expert:  Rick replied 10 months ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

If you're talking about the draft fan then if you have established a call for heat and you have power to the board then the board is suspect. There is one other possibility that you can eliminate by jumping the R & W terminals on the furnace thermostat terminal strip. If the problem persists then the board is the likely culprit.

Customer: replied 10 months ago.
Ok must be the board. I did try the R W jumper.
Expert:  Rick replied 10 months ago.

If I was at your place and found what you describe I'd replace the board but I'd check to be sure there is 24 volts at the trans former secondary before I went for a new board.