Hello, I am currently residing in a rental home and woke up to a VERY cold home in the dead of the winter in Northern Michigan.

Upon inspecting the unit I have concluded that the board is flashing at me once (solid-flash-solid-flash-solid etc.) which corresponds to "Burner Limit Circuit Open" I am reasonably mechanically inclined and I have a multimeter accessible I am hoping someone would be able to help me figure out what voltages I should be testing for and where. The unit I am working on appears to be a Quatro 409290c with HWSV9500 There are several other part numbers throughout the furnace so its hard to tell exactly which one belongs to the furnace.

On the large "stack" above the burner compartment is a tag with the information:
ADP Model: HAD3224D175B160159
Serial: 6098m12438

Inside the burning compartment on the metal wall containing the Honeywell board (Im assuming) has the following information:
Consolidated Industries
Model: MBA 100 NH3R
Serial: 950111023

And on the outside of the door covering the burner compartment is the following information:

409290c (I googled this number and returned a Quatro 409290c furnace result)
HWSV9500 (and I am assuming this is the Honeywell Part number)

I would like to try and replace these limits myself although to the naked eye I cannot tell what is the primary and what is the burner limit. I was also hoping someone might be able to tell me if these limits are universal or am I going to have a problem finding a part for this furnace (15+ years old)

Any and all help will be greatly appreciated.

The limit switch does not need replacement, it is resettable. They are hard to find but look for two wires paired together going to either the area where you see the open end of the tubes where the flames are located. This switch catches and blow back from the flame and can be pushed to reset. There is another one most of the time higher up in this same panel area, it catches blow back from the exhaust. Use a flashlight and feel around where these two wires terminate, keep touching until you find a small button and then push it