Quadra fire 1200 freestanding, only runs with short

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Quad1200

New Member
Nov 11, 2026
1
Volcano
Hello everyone,

I have a free standing Quadra Fire 1200 that will only run when the pin #4 grey wire shorts to the frame at the snap disc #3 location "when this happens the convection blower is also continuous. Without the direct short the system will not run at all. Power is verified at 120v coming in, however measuring pin 4 and 11 only shows 71.8V and pin 4 to ground shows 50V. Continuity throughout measures correctly. I am at a loss. All 3 snap disc function properly. This unit was running fine until #3 popped and the unit was swapped for a cheaper model "brought the quad back in this year".
Any help would be greatly appreciated.

Thanks,