I used a very small piece of aluminum, placed into the connector on the wires that goes toward the board. I put a small piece of electric tape on the end. You probably could use a small sliver of standard aluminum foil. Be careful not to bend the pins as the connector and pins are quite small.I'll definitely have to look into this. What did you use to connect the wires together? I'll have to double check where that piece is holding my exhaust sensor down.
I read a post on this forum going back 11 years (link provided) where someone with a Mt Vernon was having a similar problem with their hopper door switch shutting down their stove (see comment #6 in particular): Hopper Switch Shutting Down Stove
The exhaust sensor does a lot more than just provide "proof of fire" to the circuit board. It provides periodic information that the board uses to set up how the stove runs. Since I moved the probe further out from the clamp and centered it on the exhaust fan housing I've lowered the "Heat Level" to 3, tuning still at 7, with no feed errors. The stove is capable of getting much hotter now and "Heat Level 5" was too warm! It's nice to know that that extra heat is available if/when it becomes necessary.
From the Trekker manual:
"The exhaust probe is a temperature-sensing device attached to the exhaust blower housing via screw and clamp. It provides sympathetic exhaust temperature feedback to the control board. In turn, the control board uses this information to adjust its heat-output systems for best performance."