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You can't bypass the flame sensor. You can check it's output with a digital multi-meter that can read micro (not milli) amps. It's possible this could be a draft issue but it's acting like a flame rectification (sensing) issue. Check to be sure the exhaust isn't blocked with snow. Also check to be sure the condensate drain is not clogged
A phone call is an additional charge and I'm not available for a call now. We can continue here if you like. I need the model number of your furnace if you want specifics on checking the condensate drain. Clearing snow away from the vent is self evident. Do you have a meter that can read micro amps?
The exhaust vent is connected to the small draft inducer fan on the front of the unit. You'd have to trace the path of the vent to were it terminates outdoors. Give me a few to look up the specs for this model.
Here is the manual for your unithttp://dms.hvacpartners.com/docs/1009/Public/0D/58MXB-1SI.pdf
Condensate drain configs start on page 7. You need to be sure water can flow out of the collector box into the trap then out of the trap to a drain. You'll have to disconnect whatever hoses you need to check/clean the drains
A 34 error is a flame sensing error but a drain blockage can and will also cut the burner out after it fires up and since you don't have a meter you can't test the flame sensor. Double check the flame sensor connections. You may have to replace it.
No way to fool the board and that's a good thing. You could blow your house up if there was a way to bypass the sensor. If you're snowed in then the vent and condensate approach is probably your only shot at getting this running