TROUBLESHOOTING
Status | Status LED |
| Status LED Troubleshooting Information | |
LED | Description |
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Green | Module has | Supply voltage is present at module terminals | ||
“POWER” | power | |||
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| • | Compressor protector is open | |
| Thermostat | • | Check for high head pressure | |
| • | Check compressor supply voltage | ||
| demand signal | |||
| • | Outdoor unit power disconnect is open | ||
Red “TRIP” | Y is present, but | |||
• | Compressor circuit breaker or fuse(s) is open | |||
| compressor is not | |||
| • | Broken wire or connector is not making contact | ||
| running | |||
| • | Low pressure switch open if present in system | ||
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| • | Compressor contactor has failed open | |
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| • | Low refrigerant charge | |
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| • 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 connectors | |
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| — Check indoor blower control board | |
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| — Check thermostat wiring for open circuit | |
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| • | Evaporator coil is frozen | |
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| — Check for low suction pressure | |
| Long Run Time |
| — Check for excessively low thermostat setting | |
Yellow “ALERT” | Compressor is |
| — Check evaporator airflow (coil blockages or return airfilter) | |
Flash Code 1 | running extremely |
| — Check ductwork or registers for blockage | |
| long run cycles | • | Faulty metering device | |
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| — Check TXV bulb installation (size, location and contact) | |
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| — Check if TXV/fi xed orifi ce is stuck closed or defective | |
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| • | Condenser coil is dirty | |
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| • Liquid line restriction (fi lter drier blocked if present in system) | ||
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| • | Thermostat is malfunctioning | |
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| — Solenoid plug not connected | |
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| — Y2 not wired at Comfort Alert | |
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| — Check thermostat | |
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| — Check thermostat installation (location, level) | |
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| • | Comfort Alert failure | |
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| • | High head pressure | |
| System Pressure |
| — Check high pressure switch if present in system | |
| Trip |
| — Check if system is overcharged with refrigerant | |
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| — Check for | |
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| Discharge or | • Condenser coil poor air circulation (dirty, blocked, damaged) | ||
| suction | |||
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Yellow “ALERT” |
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| • | Condenser fan is not running | ||
Flash Code 2 |
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pressure out of |
| — Check fan capacitor | ||
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| limits |
| — Check fan wiring and connectors | |
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| — Check fan motor for failure or blockage | |
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| compressor | • | Return air duct has substantial leakage | |
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| • | If low pressure switch present in system, check Flash Code | ||
| overloaded | |||
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| 1 information | |
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| Table 4. LED Diagnostics | |||
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