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Fault Code Lookup

HVAC Sales Master
E152
Refrigerant leak detector sensor #2 fault
This code typically points to
  • Sensor #2 failed or reporting a sensor fault
Next checks to confirm
  1. Verify sensor #2 condition
  2. Replace sensor if the fault persists
Escalation
Low-GWP sensor fault
Reset behavior
Clears when sensor no longer reports the fault condition.
Safety Critical
Immediate concern
⚠ Cross-generation conflict
Codes E150, E151, E152, E154, E155, E160, E161, E163, E164, and E390 only exist on K-revision Lennox furnaces (EL195UHNEK, ML196UHEK). These are refrigerant leak detection codes for R-454B A2L compliance. E154/E155 will latch the blower ON for at least 5 minutes regardless of thermostat call — this is a code-mandated safety behavior. A2L refrigerant detection CANNOT be disabled — it's prohibited by safety codes.
Source
Lennox EL195UHNEK Installation Instructions 508575-01, p.46
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