When I turn the heater it does nothing, there is a blinking red light at the bottom don't have a clue what that means one long, 4 short blinks) I shut it all off and waited 10 min and flip it back on and I saw it glow but didn't hear the gas or the ingestion start and then it just turned back off again. Please help

There is a code reference on the inside panel of the door... if not I need the Model of the furnace. If the valve isn't opening up then there could be a few different reasons. Do you have and know how to use a multimeter?

The model number is 310AAV042090ACJA, I do have a multimeter but I don't know how to use it. Thank you