Fault Code Lookup

HVAC Sales Master

E150

Refrigerant leak detected

This code typically points to

Indoor coil leak
Refrigerant present at sensor
Charge issue accompanying leak

Next checks to confirm

Repair leak at or near indoor unit coil as needed
Verify proper refrigerant charge
Do not expect code to clear while sensor still reports leak

Escalation

Safety-related low-GWP event

Reset behavior

Cannot be cleared while sensor still reports a leak.

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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