PTAC
Re: DIAGNOSTIC CODES
| OPERATING MODES | ||
| Code | Status | Suggested Action |
| FP | Freeze Protection engaged | None |
| Fd | Front Desk switch is closed | Open Front Desk switch |
| Eo | Un-Configured Board | Enter configuration menu |
| EH | Emergency Hydronic engaged | Open front emergency hydronic switch |
| LS | Load Shedding engaged | Open load shedding switch |
| On | Configured for Wired Stat | None |
| oP | Open Door Lockout | Close room door switch |
| nP | Window Switch Lockout | Close door or window switch |
| hP | Heat Sentinel | Room temperature too high |
| Ur | Un-Rented Status | Front-desk need to set to Rented mode. |
| FAILURES | ||
| Code | Status | Suggested Action |
| F1 | Indoor sensor out of range | Replace Black indoor thermistor |
| F2 | Wireless Remote Thermostat failure | Replace wireless thermostat |
| F3 | Indoor sensor out of range | Replace Black indoor thermistor |
| F4 | Indoor Coil sensor out of range | Replace Red indoor coil thermistor |
| F5 | Wireless Thermostat failure | Attempt to rebind Wireless Thermostat or Replace Wireless Thermostat |
| F6 | Indoor Discharge sensor out of range | Replace Yellow Discharge thermistor |
| Fb | Low Remote Battery | Replace batteries in wireless device |
| H1 | High Voltage Protection | Check incoming power |
| br | Brown Out Protection | Check incoming power |
| AIRFLOW ALERTS | ||
| Code | Status | Suggested Action |
| L6 | Discharge air too hot | Clean filter or remove air blockage |
| LC | Outdoor coil temp high | Clean condenser coil, check for fan fault |
| C2 | Too much temp drop | Clean filter, remove air blockage, close vent door |
| C5 | Outdoor coil temp too high for ambient temp | Check for blocked outdoor air, clean coil |
| REFRIGERATION ALERTS | ||
| Code | Status | Suggested Action |
| C1 | Indoor coil too cold | Clean filter, check fan, check charge |
| C4 | Indoor coil froze-up | Clean filter, check fan, check charge |
| C6 | Poor unit performance | Check blower, compressor & heaters |
| C7 | ICT - IAT > 20 (+ 10 min) | Clean filter, check fan, check charge |