Controls · COMPONENT REFERENCE

A2L refrigerant detection and mitigation troubleshooting

Detects specified refrigerant conditions and commands the model's protective response on equipped systems.

Failure causes

Choose a cause for symptoms, checks that separate it from similar faults, repair direction and verification.

Disconnected sensor or harness fault →The controller cannot establish the required sensor connection or valid status.Refrigerant detected →The detection system reports refrigerant at its sensing location and activates its designed mitigation.

References and applicability

Original HVACSim explanations with manufacturer and instrument-maker references for further reading. These resources support the subject; their model-specific examples are not specifications for every system.

Carrier: HVAC installation and commissioning overviewSizing, airflow, charge and A2L installation considerations; obtain the exact unit manual.
Trane: Precedent Symbio R-454B refrigerant leak sensor informationA model-specific example in which sensor faults and disconnection also initiate mitigation. Responses vary by equipment.

Editorial review: 2026-09-29. Verify the current manual for the installed model.