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 | 1. | Compressor protector is open | |
| Y is present, but the | 2. | Outdoor unit power disconnect is open | |
| compressor is not | 3. | Compressor circuit breaker or fuse(s) is open | |
| running | 4. | Broken wire or connector is not making contact | |
|
| 5. | Low pressure switch open if present in system | |
|
| 6. | Compressor contactor has failed open | |
|
|
|
| |
Yellow“ALERT” | Long Run Time | 1. | Low refrigerant charge |
|
Flash Code 1 | Compressor is | 2. | Evaporator blower is not running | |
| running extremely | 3. | Evaporator coil is frozen | |
| long run cycles | 4. | Faulty metering device | |
|
| 5. | Condenser coil is dirty | |
|
| 6. | Liquid line restriction (filter drier blocked if present in system) | |
|
| 7. | Thermostat is malfunctioning | |
|
| 8. | Comfort Alert Failure | |
Yellow“ALERT” | System Pressure Trip | 1. | High head pressure | |
Flash Code 2 | Discharge or suction | 2. | Condenser coil poor air circulation (dirty, blocked, damaged) | |
| pressure out of limits or | 3. | Condenser fan is not running | |
| compressor overloaded | 4. | Return air duct has substantial leakage | |
|
| 5. | If low pressure switch present in system, check Flash | |
|
|
| Code 1 information | |
|
|
| ||
Yellow“ALERT” | Short Cycling | 1. Thermostat demand signal is intermittent | ||
Flash Code 3 | Compressor is running | 2. Time delay relay or control board defective | ||
| only briefly | 3. If high pressure switch present go to Flash Code 2 information | ||
|
| 4. If low pressure switch present go to Flash Code 1 information | ||
|
|
|
|
|
Yellow“ALERT” | Locked Rotor | 1. | Run capacitor has failed | |
Flash Code 4 |
| 2. | Low line voltage (contact utility if voltage at disconnect is low) | |
|
|
| • Check wiring connections | |
|
| 3. | Excessive liquid refrigerant in compressor | |
|
| 4. | Compressor bearings are seized | |
|
|
| • Measure compressor oil level | |
Yellow“ALERT” | Open Circuit | 1. | Outdoor unit power disconnect is open | |
Flash Code 5 |
| 2. | Compressor circuit breaker or fuse(s) is open |
3.Compressor contactor has failed open
•Check compressor contactor wiring and connectors
•Check for compressor contactor failure (burned, pitted or open)
•Check wiring and connectors between supply and compressor
•Check for low pilot voltage at compressor contactor coil
4.High pressure switch is open and requires manual reset
5.Open circuit in compressor supply wiring or connections
6.Unusually long compressor protector reset time due to extreme ambient temperature
7.Compressor windings are damaged
•Check compressor motor winding resistance
| Yellow“ALERT” | Open Start Circuit | 1. | Run capacitor has failed | |
| Flash Code 6 | Current only in run circuit | 2. | Open circuit in compressor start wiring or connections | |
|
|
|
| • Check wiring and connectors between supply and the | |
|
|
|
| compressor “S” terminal | |
|
|
| 3. | Compressor start winding is damaged | |
|
|
|
| • Check compressor motor winding resistance | |
|
|
|
|
|
|
| Yellow “ALERT” | Open Run Circuit | 1. | Open circuit in compressor run wiring or connections | |
| Flash Code 7 | Current only in start circuit |
| • Check wiring and connectors between supply and the | |
|
|
|
| compressor “R” terminal | |
|
|
| 2. | Compressor run winding is damaged | |
|
|
|
| • Check compressor motor winding resistance | |
| 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” | LowVoltage | 1. | Control circuit transformer is overloaded | |
| Flash Code 9 | Control circuit < 17VAC | 2. | Low line voltage (contact utility if voltage at disconnect is low) |
•Check wiring connections
•Flash Code number corresponds to a number of LED flashes, followed by a pause and then repeated.
•TRIP and ALERT LEDs flashing at same time means control circuit voltage is too low for operation.
Table 1. Interpreting the Diagnostic LEDS
12