Carrier Rooftop Units: 48TJ
Re: Diagnostic Codes
| LED Error Code Service Analysis | |
| Off | No power to control, Blown fuse |
| 1 Flash | Extended fan on/off delay due to limit trip * |
| 2 Flash | Hi Limit Switch Open |
| 3 Flash | Flame sensed with no call for heat |
| 4 Flash | 4 consecutive limit trips |
| 5 Flash | 15 min failure to ignite |
| 6 Flash | Failure to prove inducer motor status |
| 7 Flash | Rollout Switch Open |
| 8 Flash | Internal Control Fault |
* The normal Fan On/Off delay is 45 seconds. If the limit switch opens before the blower energizes or if the limit opens after the blower shuts off, the IGC will automatically adjust the on/off delay time and flash Code 1.