Pro-Series Error Codes (LLL / HHH)

Summary: The error codes LLL (Low Limit) and HHH (High Limit) indicate that the sensor is reading a temperature outside its physical capabilities. While this can happen in extreme liquid nitrogen or industrial kiln environments, in a BBQ context, it almost always indicates probe damage (a short circuit).

What the Codes Mean

Error Code	Technical Meaning	Possible Real-World Cause
LLL	Temp is below -58°F (-50°C).	Moisture Damage. Water has entered the probe, creating a short circuit.
HHH	Temp is above 572°F (300°C).	Heat Damage. The internal sensor has melted or fused, creating a short circuit.

Why Did This Happen?

If your smoker is at 225°F but the probe reads "HHH," the probe is not measuring the air anymore; it is a broken circuit.

• Thermal Shock: Exposing the probe to temperatures above 572°F (like touching a grill grate or flame) typically triggers a permanent "HHH" error.
• Cable Damage: If the wire was pinched or kinked, internal strands can touch each other, causing a short circuit (simulating extreme temperatures).

How to Fix It

Because these errors usually represent physical damage to the internal sensor wire:

1. Test: Unplug the probe and plug in a different Pro-Series probe if you have one.
   • If the new probe works, the original probe is dead and needs replacement.
   • If the error persists even with a new probe, the issue may be the device port itself.
2. Replace: LLL/HHH errors are generally non-recoverable. Please check your probe's warranty status.

Warranty or Replacement Options

• Probes with physical damage (such as exposed wires, melted, pinched, or shorted cables) are not repairable and will require replacement.
• If the probe is still under warranty, a replacement may be issued after support has evaluated the probe and its condition.
• If the probe is no longer under warranty, a new probe purchase will be required.