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| Flash Codes | |
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| LED | Fault Description | Troubleshooting Information |
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| Status |
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| POWER | Module has power | Supply voltage is present at module terminals |
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| (Green) |
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| 1. Compressor protector is open |
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| * Check for high head pressure |
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| Thermostat demand | * Check compressor supply voltage |
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| TRIP | signal Y1 is present, | 2. Outdoor unit power disconnect is open |
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| (Red) | but the compressor | 3. Compressor circuit breaker or fuse(s) is open |
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| is not running | 4. Broken wire or connector is not making contact |
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| 5. Low pressure switch open if present in system |
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| 6. Compressor contactor has failed open |
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| 1. Low refrigerant charge |
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| 2. Evaporator blower is not running |
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| * Check blower relay coil and contacts |
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| * Check blower motor capacitor |
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| * Check blower motor for failure or blockage |
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| * Check evaporator blower wiring and connector |
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| * Check indoor blower control board |
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| * Check thermostat wiring for open circuit |
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| ALERT | Long Run Time | 3. Evaporator coil is frozen |
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| Compressor is | * Check for low suction pressure |
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| (Yellow) |
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| running | * Check for excessively low thermostat setting |
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| Flash |
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| extremely long run | * Check evaporator airflow (coil blockages or return air filter) |
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| Code 1 |
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| cycles | * Check ductwork or registers for blockage |
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| 4. Faulty metering device |
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| * Check TXV bulb installation (size, location, and contact) |
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| * Check if TXV/fixed orifice is stuck closed or defective |
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| 5. Condenser coil is dirty |
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| 6. Liquid line restriction (filter drier blocked if present in system) |
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| 7. Thermostat is malfunctioning |
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| * Check thermostat |
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| * Check thermostat installation (location, level) |
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| 1. High head pressure |
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| * Check high pressure switch if present in system |
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| System | * Check if system is overcharged with refrigerant |
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| ALERT | Pressure Trip | * Check for |
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| Discharge or suction | 2. Condenser coil poor air circulation (dirty, blocked, damaged) |
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| (Yellow) |
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| pressure | 3. Condenser fan is not running |
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| Flash |
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| out of limits or | * Check fan capacitor |
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| Code 2 |
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| compressor | * Check fan wiring and connectors |
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| overloaded | * Check fan motor for failure or blockage |
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| 4. Return air duct has substantial leakage |
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| 5. If low pressure switch present in system, check Flash Code 1 info |
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| Table 9 | |
Issue 1008 | Page 17 |
