Hello, are you familiar with what and where the pressure switch is ?
I am not completely familiar, but I see a device hooked to the blower by tubing with some electrical terminals.
The rest of the components are in the lower section behind a cover/
looks like this.
we want to identify if the fault is in the proving section of air flow. Turn the power off.
Remove the 2 wires from the switch, start the furnace, after the exhaust fan starts touch the 2 wires together so they make contact. Hold them that way. Tell me unit progresses or not.
put wires back. Now around the burner box are dime sized switches with tiny reset button in the center. See here -
Press center button on all the switches around the burner...tell me if one clicks.
Do I need the power on before hitting the resets?
How many resets should I find? I see something outboard the circuit board that looks like a reset, but nothing on the board that I can identify.
Excellent!....now, here is the deal...If the reset pops again we have to find out why. The safety can pop if the vent was plugged a bit...or if the heat exchanger has a crack.
The thing to do is watch the flame as it starts, watch the pattern and when the blower kicks on see if the flame flutters at all. That would be the sign of a blocked or cracked exchanger.
I thank you for your patience, it was nice working with you.
Sorry, wish you had heat. The great thing about that furnace though...you can only be cold if something goes wrong. It is loaded with safetys.