If the temperature of the grill falls below 120° F for 600 sec then your grill will go into a shutdown state and you will see low temp error on display. Hopefully, you can fix this by removing pellets the turning the controller off and on again. Now, restart your grill.nnAnother reason how cold is too cold for Trager is the low ambient temp error. It occurs after 30 seconds with the ambient temperature below -20°F. If the grill is plugged in and left in standby mode. The grill will not work if the ambient temperature gets -40°F. To fix the grill, you will need to warm up the controller.