Lennox Air Conditioner error codes
2 Lennox air conditioner codes and problems, each with ranked causes, safe homeowner checks and honest repair costs. Count the flashes or read the code on your control board, then find it below. Legends vary by board revision, so confirm against the label inside your unit's door.
| Code | What it means | Severity |
|---|---|---|
| Frozen evaporator coil | Why a Lennox AC evaporator coil freezes: low airflow, low refrigerant, blower or metering faults. Safe thaw steps, technician fixes and US repair costs. | Call a pro |
| Not cooling | Lennox AC not cooling? Learn the likely causes, from dirty filters and capacitors to refrigerant leaks, safe fixes and honest US repair costs. | Call a pro |
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