Quote:
Originally Posted by Bugsinrugs
It has three lights on top of the control board. One orange and two green. The green ones are on but the orange one flashes when I push in the interlock button. This button is usually depressed when the panel is on. When I depress this button the unit has a faint humming sound..
It's a Ruud/ Rheem LPG unit.
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That is the door switch and it prevents the furnace from running without the blower door.
The humming is the transformer. It hums because it has forgotten the words....
Turning the unit off and on again typically resets the board and it will not necessarily show the fault after the reset.
Edit: Looked up a generic Rheem/Ruud wiring diagram and it looks as though there are two manual reset limits then two automatic limits in series with the W1 heat terminal. All these need to be in there normal position (closed) before the unit will try to fire the heat. Finding which one is open could be as simple as pressing a small pushbutton on the limit or finding 24 VAC potential across the switch when it is calling for heating.