Furnace Issue
So I'm at the end of my rope. Atwood 8531-iv furnace in a 2005 Max Lite. Furnace started intermittently running ok and then not running at all. When it didn't run, it would start the fan, ignite the b...
Forum Discussion
Flame sensor failure... On most of these the flame sensor is also the spark rod. During IGNITION it has about 1,000 volts AC on the wire. then it swiches over to Flame Sense.. that's (ROunding shamlessely) about 1/2 volt DC.. Can you see a possible problem if the switchover goes funny and the last of the thousand volts hits that senisitive chip? Chips a poppin that's for sure.
Now it can no longer sense flame
So I got a new control board from Dinosaur boards.. First thign I noticed when I opened the box (I'm trained in electronics) Was that it was one quality board. Very well built. Solid plating of the traces. Well done.
Then I turned it over to the component side and right about next to where I thin that sensor chip is there sat what is called a Gas Discharge Tube (Like a NEON night light bulb.. in fact I suspect that's what it was The standard NE2 Neon bulb limits voltage to 90 DC at that point it lights up and sunts that thousand volt spike to ground protecting the chip.. Worked too.
Now it can no longer sense flame
So I got a new control board from Dinosaur boards.. First thign I noticed when I opened the box (I'm trained in electronics) Was that it was one quality board. Very well built. Solid plating of the traces. Well done.
Then I turned it over to the component side and right about next to where I thin that sensor chip is there sat what is called a Gas Discharge Tube (Like a NEON night light bulb.. in fact I suspect that's what it was The standard NE2 Neon bulb limits voltage to 90 DC at that point it lights up and sunts that thousand volt spike to ground protecting the chip.. Worked too.
