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-   -   Lennox 80UHG failing to ignite-"Open Roll-Out Switch Circuit" (http://www.diychatroom.com/f17/lennox-80uhg-failing-ignite-open-roll-out-switch-circuit-170726/)

ruleof72 02-01-2013 07:24 AM

Lennox 80UHG failing to ignite-"Open Roll-Out Switch Circuit"
 
Hi,

Our 1999 Lennox 80UHG furnace has been failing to ignite on an intermittent basis. It's been every 1-3 weeks that it happens. Most of the time the ignitor is failing to come on. Each time I am able to "fix" it by removing and reconnecting the wire that connects to what I think is the flame sensor (the one on the opposite end from the ignitor). Each time the LED diagnostic light were both flashing quickly, indicating normal operation.


This morning, the furnace was failing to come on and when I looked at the LED's they were: Top light-on, Bottom-slow flash. By the guide on the panel, that indicates an "Open Roll-Out Switch Circuit". This is the 1st time I've seen this code. I was able to do what I've done in the past-Remove/re-connect the flame sensor wire- and the furnace seems to be working fine again.

Any suggestions as to what might actually be happening? I'm wondering if the control board is bad? I say this because it happened once the day after the furnace tech had come to inspect the system. He came back but couldn't find anything and indicated it might be the control board, which they would replace for $600 or so. Obviously, I'd like to fix it if I can for less than that if I can.

Any help will definitely be appreciated!

Marty S. 02-01-2013 11:35 AM

The flame sensor is not in the same circuit as the rollout switch. Disconnecting it should not reset your furnace. Sounds like a control board issue.

ruleof72 02-01-2013 12:29 PM

Quote:

Originally Posted by Marty S. (Post 1107146)
The flame sensor is not in the same circuit as the rollout switch. Disconnecting it should not reset your furnace. Sounds like a control board issue.

Thanks for the info. Now, if it's a control board, are there reliable replacements that I can get that are reasonably priced? The HVAC tech quoted around $600 to replace the board. I'm not a service tech but I can follow directions, is this something I can do safely for less?

fy171 02-01-2013 05:09 PM

whats the rest of the model number

http://www.midwesthvacparts.com/Prod...nox-17w82.aspx

ruleof72 02-01-2013 07:06 PM

Found a White Rodgers control board-Any feedback?
 
Quote:

Originally Posted by fy171 (Post 1107421)

The full model # is 80UHG3/4-100A

I've done some research and found a White/Rodgers "Universal" ignition control board that's around $100 and seems to get good reviews. Does anyone have experience with it?

Marty S. 02-01-2013 08:23 PM

I only use OEM parts for Lennox boards. Cozy parts will have one.


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