| Carrier Error Code | What this means |
|---|---|
| Solid on, one flash, and two flashes | Normal operation |
| Error Code 16 | System communication failure |
| Error Codes 31 and 84 | High-pressure problem |
| Error Codes 32 and 83 | Low-pressure problem |
| Error Code 45 | Fault with the control board |
| Error Codes 46, 47, 73, 74, 75, 76, 77, 78, 85, and 87 | Voltage problems |
| Error Code 53 | Fault with the outdoor temperature sensor |
| Error Code 55 | Problem with the coil |