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 Randall Your Own Question
Randall, RVIA Certification
Category: RV
Satisfied Customers: 15400
Experience:  RVDA/RVIA Master Certified Technician with many years experience.
Type Your RV Question Here...
Randall is online now
A new question is answered every 9 seconds

I have an Atwood 8500 series furnace in my RV. When I turn

This answer was rated:

I have an Atwood 8500 series furnace in my RV. When I turn it on it sounds like it comes on but then shuts off after a short time, maybe 15 seconds. I though it lit before it shut down but can't be sure.
JA: Just to clarify, what are the exact lights you're talking about?
Customer: lighting the burner
JA: What is the model of your '15 RV?
Customer: 2012 Crusader 355BHQ
JA: Are you fixing your RV yourself? What have you tried so far?
Customer: I have not tried anything yet since I do not know what to look for. I will try myself if something i can do.
JA: Anything else you want the mechanic to know before I connect you?
Customer: No

Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.

Customer: replied 12 months ago.
like what

That is usually the result of a flame sense failure on the control board. These OEM boards are not good quality and made in China. I only sell an after market board made in Oregon by Dinosaur Electronics. Superior quality. If you give me the make and model of your furnace I can supply a manual and offer more here. If you have an outside inspection cover over the furnace these are easy to access and replace. If not, the furnace has to be removed from the inside. Hope that gives you some direction here. Please get back to me with the information above if you need more as all follow ups are included in our one time fee. No time limit.

Customer: replied 12 months ago.
Ok thanks. I will have to go back out to the RV to get the model.

You reported it was an 8500 series, but there are multiple models of those. The control board for most of those in that year are called a "Fan 50 Plus" model and you can Google that for the best price. Amazon has them as do many other RV online dealers.

Customer: replied 12 months ago.

You are most welcome! I can get you a Service Manual later today as soon as I get to my computer. Helpful to have.

Customer: replied 12 months ago.
Great thanks


See the attached link for a copy of the manual. Print this out so you have it.

Customer: replied 12 months ago.
the model is Atwood 8535 IV DCLP. The light on the circuit board is flashing 3sec intervals. It does try to light 3 times then shuts down. What should I check?

Is this with the old or new circuit board?

Plenty of LP in the tanks? Pressure checked and adjusted recently?

Customer: replied 12 months ago.
old board and yes plenty of gas. We just recently put on a full tank.
Customer: replied 12 months ago.
have not checked the pressure. Don't have a way to do that.

I thought you were getting a new board? If you take the regulator into shop they can adjust it for you, as long as it is an adjustable version.

Randall and other RV Specialists are ready to help you