Traeger Temperature Swings: Why Your Grill Fluctuates and How to Fix It

Traeger temperature swings of +/- 25F are NORMAL for pellet grills - this is how PID (Proportional-Integral-Derivative) controllers work. The controller feeds pellets, lets the fire build, then reduces feed, creating a wave pattern. However, swings of +/- 50F or more indicate a problem. The #1 cause of excessive temperature swings is a dirty firepot: ash buildup creates inconsistent combustion - sometimes the fire burns hot through an air pocket in the ash, then smothers when the pocket collapses. The #2 cause is the RTD temperature probe being bent or touching the grill barrel: metal contact gives false readings, causing the controller to overcorrect. The #3 cause is pellet quality: pellets with high sawdust content or moisture burn inconsistently. The #4 cause is wind: even light wind through the chimney cap affects the fire. Traeger's WiFIRE D2 controller handles temperature better than the older non-WiFi controller because the PID algorithm is more aggressive at maintaining temperature. Older Traegers use P-settings to adjust swing behavior.