Status LED | Status LED Description | Status LED Troubleshooting Information |
Green “POWER” | Module has power | Supply voltage is present at module terminals |
Red “TRIP” | Thermostat demand signal Y1 is present, but the compressor is not running | 1. Compressor protector is open |
| | 2. Outdoor unit power disconnect is open |
| | 3. Compressor circuit breaker or fuse(s) is open |
| | 4. Broken wire or connector is not making contact |
| | 5. Low pressure switch open if present in system |
| | 6. Compressor contactor has failed open |
Yellow “ALERT” Flash Code 1 | Long Run Time. Compressor is running extremely long run cycles | 1. Low refrigerant charge |
| | 2. Evaporator blower is not running |
| | 3. Evaporator coil is frozen |
| | 4. Faulty metering device |
| | 5. Condenser coil is dirty |
| | 6. Liquid line restriction (filter drier blocked if present in system) |
| | 7. Thermostat is malfunctioning |
Yellow “ALERT” Flash Code 2 | System Pressure Trip. Discharge or suction pressure out of limits or compressor overloaded | 1. High head pressure |
| | 2. Condenser coil poor air circulation (dirty, blocked, damaged) |
| | 3. Condenser fan is not running |
| | 4. Return air duct has substantial leakage |
Yellow “ALERT” Flash Code 3 | Short Cycling. Compressor is running only briefly | 1. If high pressure switch open, go to Flash Code 2 information |
| | 2. If low pressure switch open, go to Flash Code 1 information |
| | 3. Thermostat demand signal is intermittent |
| | 4. Loose wiring at contactor coil |
Yellow “ALERT” Flash Code 4 | Locked Rotor | 1. Run capacitor has failed |
| | 2. Low line voltage (contact utility if voltage at disconnect is low) |
| | 3. Excessive liquid refrigerant in compressor |
| | 4. Compressor bearings are seized |
Yellow “ALERT” Flash Code 5 | Open Circuit | 1. Outdoor unit power disconnect is open |
| | 2. Compressor circuit breaker or fuse(s) is open |
| | 3. Compressor contactor has failed open |
| | 4. High pressure switch is open and requires manual reset |
| | 5. Open circuit in compressor supply wiring or connections |
| | 6. Unusually long compressor protector reset time due to extreme ambient temperature |
| | 7. Compressor windings are damaged |
Yellow “ALERT” Flash Code 6 | Open Start Circuit. Current only in run circuit | 1. Run capacitor has failed |
| | 2. Open circuit in compressor start wiring or connections |
| | 3. Compressor start winding is damaged |
Yellow “ALERT” Flash Code 7 | Open Run Circuit. Current only in start circuit | 1. Open circuit in compressor run wiring or connections |
| | 2. Compressor run winding is damaged |
Yellow “ALERT” Flash Code 9 | Low Voltage. Control circuit < 17VAC | 1. Control circuit transformer is overloaded |
| | 2. Low line voltage (contact utility if voltage at disconnect is low) |