60 seconds. The module will continue to display the previous flash code until the condition returns to normal or 24VAC is removed from the module. TRIP and ALERT LEDs flashing at the same time means control circuit voltage is too low for operation.
24VAC Power Wiring
The diagnostic module requires a constant nominal 24VAC power supply. The wiring to the module’s R and C terminals must be directly from the indoor unit or thermo- stat. The module cannot be powered by R and C terminals on the defrost board without experiencing nuisance alerts.
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| Flash Codes (cont.) | |
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| LED | Fault Description | Troubleshooting Information |
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| Status |
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| ALERT | Short Cycling | 1. Thermostat demand signal is intermittent |
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| (Yellow) | Compressor is | 2. Time delay relay or control board defective |
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| Flash | running | 3. If high pressure switch present, go to Flash Code 2 info |
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| Code 3 | only briefly | 4. If low pressure switch present, go to Flash Code 1 info |
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| 1. Run capacitor has failed |
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| ALERT |
| 2. Low line voltage (contact utility if voltage at disconnect is low) |
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| (Yellow) | Locked Rotor | * Check wiring connections |
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| Flash | 3. Excessive liquid refrigerant in compressor |
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| Code 4 |
| 4. Compressor bearings are seized |
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| *Measure compressor oil level |
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| 1. Outdoor unit power disconnect is open |
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| 2. Compressor circuit breaker or fuse(s) is open |
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| 3. Compressor contactor has failed open |
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| * Check compressor contactor wiring and connectors |
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| ALERT |
| * Check for compressor contactor failure (burned, pitted, or open) |
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| (Yellow) | Open Circuit | * Check wiring and connectors between supply and compressor |
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| Flash | * Check for low pilot voltage at compressor contactor coil |
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| Code 5 |
| 4. High pressure switch is open and requires manual reset |
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| 5. Open circuit in compressor supply wiring or connections |
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| 6. Unusually long compressor protector reset time due to extreme ambient temperature |
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| 7. Compressor windings are damaged |
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| * Check compressor motor winding resistance |
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| ALERT |
| 1. Run capacitor has failed |
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| Open Start Circuit | 2. Open circuit in compressor start wiring or connections |
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| (Yellow) |
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| Current only in run | * Check wiring and connectors between supply and the compressor S terminal |
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| Flash |
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| circuit | 3. Compressor start winding is damaged |
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| Code 6 |
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| * Check compressor motor winding resistance |
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| ALERT | Open Run Circuit | 1. Open circuit in compressor run wiring or connections |
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| (Yellow) | * Check wiring and connectors between supply and the compressor R terminal |
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| Current only in start |
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| Flash | 2. Compressor run winding is damaged |
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| circuit |
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| Code 7 | * Check compressor motor winding resistance |
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| ALERT | Welded Contactor |
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| (Yellow) | 1. Compressor contactor has failed closed |
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| Compressor always |
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| Flash | 2. Thermostat demand signal not connected to module |
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| runs |
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| Code 8 |
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| ALERT | Low Voltage | 1. Control circuit transformer is overloaded |
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| (Yellow) |
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| Control circuit less | 2. Low line voltage (contact utility if voltage at disconnect is low) |
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| Flash |
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| than 17VAC | * Check wiring conditions |
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| Code 9 |
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| Table 11 | |
Page 23 | Issue 1004 |