Table 14 — LED Status Codes
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 Y | 1. | Compressor protector is open | |
LED On Solid | is present, but the | 2. | Condensing unit power disconnect is open | |
| compressor is not running. | |||
| 3. | Compressor circuit breaker or fuse(s) is open | ||
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| 4. | Broken supply wires or connector is not | |
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| making contact | |
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| 5. | Compressor power wires not routed through | |
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|
| Comfort Alert | |
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| 6. | Compressor contactor has failed open | |
Red “TRIP” LED | The | minutes), in module is preventing compressor | ||
Flashing | restart. |
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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 current | 1. | Compressor contactor coil shorted | |
LED On Solid | condition exists on PROT | 2. | Electrical load too high for PROT circuit | |
| terminal. | |||
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| (maximum 1 Amp) | ||
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| ||
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| 3. | 24 V AC wired directly to PROT terminal | |
Yellow “ALERT” | System Pressure Trip | 1. | High head pressure | |
Flash Code 2 | Discharge pressure out of | 2. | Condenser coil poor air circulation (dirty, | |
| limits or compressor | |||
|
| blocked, damaged) | ||
| overload (if no high pressure |
| ||
| 3. | Condenser fan is not running | ||
| switch in system) | |||
| LOCKOUT | 4. | If low pressure switch is open: | |
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|
| Refer to Code 3 for troubleshooting | |
Yellow “ALERT” | Short Cycling | 1. | If low pressure switch is open: | |
Flash Code 3 | Compressor is running only |
| a. | Low refrigerant charge |
| briefly LOCKOUT |
| ||
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| b. Evaporator blower is not running | ||
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| ||
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| c. Evaporator coil is frozen | |
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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 |
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|
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| present) |
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| 2. | If high pressure switch is open, go to Flash | |
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| Code 2 information | |
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| 3. | Intermittent thermostat demand signal | |
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| 4. | System or control board defective | |
Yellow “ALERT” | Locked Rotor | 1. | Low line voltage to compressor | |
Flash Code 4 | LOCKOUT | 2. | Excessive liquid refrigerant in compressor | |
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| |||
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| 3. | Compressor bearings are seized | |
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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| |||
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| 3. | Compressor contactor has failed open | |
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| 4. | High pressure switch is open and requires | |
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| manual reset | |
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| 5. | Broken supply wires or connector is not | |
|
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| making contact | |
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| 6. | Unusually long compressor protector reset | |
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| time due to extreme ambient temperature | |
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| 7. | Compressor windings are damaged | |
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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| |||
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| 3. | Compressor motor winding is damaged | |
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| 4. | Utility supply has dropped one phase | |
Yellow “ALERT” | Reverse Phase | 1. | Compressor running backward due to supply | |
Flash Code 7 | LOCKOUT |
| phase reversal | |
Yellow “ALERT” | Welded Contactor | 1. | Compressor contactor has failed closed | |
Flash Code 8 | Compressor always runs | 2. | Thermostat demand signal not connected to | |
|
|
| module | |
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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