38AU
Table 11 – LED Status Codes
Status LED | Status LED Description | Status LED Troubleshooting Information | |
Green “POWER” | Module has power | Supply voltage is present at module terminals | |
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Red “TRIP” | Thermostat demand signal | 1. | Compressor protector is open |
LED On Solid | Y is present, but the com- | 2. | Condensing unit power disconnect is open |
| pressor is not running. | ||
| 3. | Compressor circuit breaker or fuse(s) is open | |
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| 4. | Broken supply wires or connector is not making contact |
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| 5. | Compressor power wires not routed through Comfort Alert |
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| 6. | Compressor contactor has failed open |
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Red “TRIP” LED | The | ||
Flashing |
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Module locks out compressor when compressor damaging ALERT code appears. Lockout ALERT codes are noted in the Status LED Description.
During a compressor lock out, 24VAC power must be removed from module to manually reset.
Yellow “ALERT” | A short circuit or over cur- | 1. | Compressor contactor coil shorted | |
LED On Solid | rent condition exists on | 2. | Electrical load too high for PROT circuit (maximum 1 Amp) | |
| PROT terminal. | |||
| 3. | 24 V AC wired directly to PROT terminal | ||
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Yellow “ALERT” | System Pressure Trip | 1. | High head pressure | |
Flash Code 2 | Discharge pressure out of | 2. | Condenser coil poor air circulation (dirty, blocked, damaged) | |
| limits or compressor over- | |||
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| load (if no high pressure | 3. | Condenser fan is not running | |
| switch in system) | 4. | If low pressure switch is open: Refer to Code 3 for troubleshooting | |
| LOCKOUT | |||
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Yellow “ALERT” | Short Cycling | 1. | If low pressure switch is open: | |
Flash Code 3 | Compressor is running only |
| a. | Low refrigerant charge |
| briefly (four consecutive |
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| cycles of less than three |
| b. | Evaporator blower is not running |
| minutes each) |
| c. | Evaporator coil is frozen |
| LOCKOUT |
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| d. | Faulty metering device |
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| e. Condenser coil is dirty | |
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| f. | Liquid line restriction (filter drier blocked if present) |
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| 2. | If high pressure switch is open, go to Flash Code 2 information | |
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| 3. | Intermittent thermostat demand signal | |
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| 4. | System or control board defective | |
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Yellow “ALERT” | Locked Rotor | 1. | Low line voltage to compressor | |
Flash Code 4 | LOCKOUT | 2. | Excessive liquid refrigerant in compressor | |
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| 3. | Compressor bearings are seized | |
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Yellow “ALERT” | Open Circuit | 1. | Condensing unit power disconnect is open | |
Flash Code 5 |
| 2. | Compressor circuit breaker or fuses are open | |
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| 3. | Compressor contactor has failed open | |
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| 4. | High pressure switch is open and requires manual reset | |
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| 5. | Broken supply wires or connector is not making contact | |
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| 6. | Unusually long compressor protector reset time due to extreme | |
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| ambient temperature | |
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| 7. | Compressor windings are damaged | |
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Yellow “ALERT” | Missing Phase | 1. | Compressor fuse is open on one phase | |
Flash Code 6 | LOCKOUT | 2. | Broken wire or connector on one phase | |
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| 3. | Compressor motor winding is damaged | |
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| 4. | Utility supply has dropped one phase | |
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Yellow “ALERT” | Reverse Phase | 1. | Compressor running backward due to supply phase reversal | |
Flash Code 7 | LOCKOUT |
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Yellow “ALERT” | Welded Contactor | 1. | Compressor contactor has failed closed | |
Flash Code 8 | Compressor always runs | 2. | Thermostat demand signal not connected to module | |
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Yellow “ALERT” | Low Voltage | 1. | Control circuit transformer is overloaded | |
Flash Code 9 | Control circuit < 18VAC | 2. | Low line voltage to compressor | |
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