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High Temp Error and Low Temp Error

The manual, pages 28 and 29. The Pro 575 shows messages in words.

High Temp Error (the manual adds "HEr"): above 288 °C (550 °F) for 45 seconds; the fan and auger stop. Let it cool, look over the hopper, auger and firepot, clean, clear the pellets, and restart with the lid closed. Usual causes: a grease fire, or a restart without clearing the firepot.
Low Temp Error (the manual adds "LEr"): below 49 °C (120 °F) for 10 minutes; it shuts down. Let it cool, unplug, and remove all pellets and ash from the firepot and barrel before you restart. Causes: a bad start, no cleaning, out of pellets, wet pellets.
Low Temp Detected: below the set temperature for 4 minutes. Information only; it can lead to Low Temp Error.
Low Temp Warning: the fire went out and has not recovered. Check the pellets and restart.

Clear messages with MENU > Settings > Clear Notifications, or by switching off and on.

The manual and Traeger support.

Slow Ignition: no rise 15 minutes after lighting. Wait; check the firmware and pellets.
Failed to Ignite: out of pellets, wet or old pellets, or the hot rod did not light. Check the hopper and prime, clean the firepot, test the hot rod.
Ignition Warning (app only): no ignition seen in time. Check the pellets and restart.
Igniter Disconnect / Hot Rod Disconnected: reseat the plugs behind the controller, then replace the hot rod.
Fan Disconnected: reseat the fan plug; then replace the fan.
Auger Disconnected: reseat the motor plug; then replace the motor.
Auger Overcurrent: the auger is jammed, usually by wet pellets. Clear Auger with the grill cold.

The manual and Traeger support.

Temp Sensor Out / Thermocouple Disconnected: reseat the sensor's yellow plug behind the controller, + to +; then replace the sensor (KIT0422).
Low Ambient Temp: below −29 °C (−20 °F) for 30 seconds. Warm the grill and check the display.
Insert Probe: plug the meat probe in.
Probe Fell Out: the probe read over 104 °C (220 °F). Push it fully back into the food.
Bad Probe: push the plug fully home, rub it clean, calibrate; then replace the probe (KIT0780).
Pellet Level Low: only with the optional pellet sensor.
Demo mode showing: MENU > Settings > Demo Mode off.