This article includes instruction regarding what to do if a grill is running too cool, or the flame is out.
Even though the controller blinks 450°F (232°C) when turning the controller to high, high is a range of 425 - 450°F (218 - 232°C). The Controller goes up in an incremental pattern of 25°F (15°C). There is no need to troubleshoot if your grill performs within these ranges.
If you have a connected grill, ensure your grill is on the latest firmware.
An incorrect start-up can cause the flame to go out even hours into a cook.
The grill needs to be allowed to run its whole shutdown cycle and then it can be powered off. An excess amount of ash can be blocking the hot rod from igniting the pellets or blocking airflow.
Ensure there is at least 1 inch of clearance on all sides. Cooking with a large pan can prevent proper airflow causing the grill to run cooler or have some drastic temperature swings.
Having a dirty grill can affect the temperature of the grill in multiple different ways.
Sometimes it is too cold outside, which makes it difficult for the grill to reach temperature. In this scenario, use an insulation blanket.
The lid should sit flush against the barrel. A small gap is ok as long as it is less than a quarter of an inch (0.65 cm)