This is Turtle.

It would be hard to say which part it was but it is one of these. Flame
sencewr, stop up jet on pilot, Vent Fan Air prover switch, or the relay
board. Now it could be a squirrel that got stuck in the vent pipe from
the roof.

RPJ2 / Arcoaire/ Carrier / Whirlpool / or any ICP products will be
replaced with the parts. the last one i worked on , i got the parts
from Arcoaire warehouse for the model numbers was the same to find
parts.

TURTLE