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If fuse is blowing there is a short somewhere in control circuit Could be in thermostat, wiring between units ,furnace board or internal components. Is there any patter as to WHEN it blows? Examples
1. Only when turned to AC
2.As son as fan comes on
3.When gas valve opens
Shots like this can be hard to find since not blowing every time not comes on.Even when blowing everytime often takes several fuses as we try different things to eliminate the short.The way to determine is first look for any nicked or chewed wires that may be touching in control circuit between units and thermostat. Then by disconnecting components until it no longer blows.My recommendation is to try to monitor it to see if there is a pattern that might indicate what is changing that would cause the short.
Let me know and we will see if we can determine what is creating short.
Do not see the furnace 2 image
Only seeing image 1
Ok the one in image two is a high temperature limit switch.Disconnecting wires would just break circuit in the control wiring
I honestly am suspecting you may have a control board going out.
Simple plug and play replacement