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Hello, one minute while I get some information together.
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You need to remove 1 thermostat wire at a time from the board starting with the Yellow wire then try it to narrow down which one is causing it to blow. The you will have to trace the wires to see if one is rubbed through or there is a bad connection on the wire. One of the thermostat wires is typically causing this issue.
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Yes then you need to put one wire on at a time to see which one is causing it or run a new thermostat cable.
OK then remove the G wire
Read the error code on the back of the panel for the two slow flashing lights...I think that is in standby waiting for a signal from the thermostat.
Jumper R to W at the board and see if the heat comes on if it does something is wrong with the thermostat wiring or thermostat...also make sure you have the switched depressed on the panel on the furnace or it will not work.