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is the small exhaust fan running that is attached to the vent/exhaust pipe?
ok that is the issue...the control box says "I sent power to exhaust fan"...now it is waiting for a air proving switch to close...which cant close if the exhaust does not run.
That is the issue...we need to see why the fan is not running...does it have power but is stuck? Does not have power?
by fan...I mean small exhaust fan..not main blower
now with exhaust running...connect the 2 wires you tested directly together..
do the 2 black wires have 120v? keep the red and blacks separate
as far as testing....only test red to red and black to black.
If you have zero volts black to black...we have no power to the exhaust fan motor.
Trace the black wires back to origin..does the black start from a control board?
You have a bad control module. The control "thinks" it sent power is waiting for the air switch to close...but it actually did not send power.
You will need to replace the control
I am available for 30 days after the service is rated so if you need help just return here.
correct.....IND = Inducer motor.
That wire should have 120v on it anytime the control is blinking that fault code.
If you turn power off to furnace and back on....does it start solid...then blinks?