On Nov 14, 5:04*pm, wrote:
Hi;

I have a ruud furnace that wont stay running. The unit goes through
the start up cycle. The electronic igniter will start sparking, and
the flame will ignite. It will run good for about *5-7 seconds, then
it *it will go out like the unit cut the gas off. I think it is a
flame sensor, but I am not sure what it is called.

This furnase has a circuit board with 3 leds. two are green and one is
yellow. It says Flame. This light flashes, but the other two stay
solid green. I cant find a manual to see how to read these. Any help
or pointers would be appreciated.

I was able to clean the flame sensor and all is well. Thanks for the
advice. My Yellow Flame Led is flashing which means it is a weak
signal. I will order a new flame sensor and install it when it
arrives.