SERVICING
DIAGNOSTICS TABLE
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 |
| Y1 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 |
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) |
|
| 3. | Excessive liquid refrigerant in compressor |
|
| 4. | Compressor bearings are seized |
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 |
|
| 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 |
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 |
|
| 3. | Compressor start winding is damaged |
Yellow “ALERT” | Open Run Circuit | 1. | Open circuit in compressor run wiring or connections |
Flash Code 7 | Current only in start circuit | 2. | Compressor run winding is damaged |
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 < 17VAC | 2. | Low line voltage (contact utility if voltage at disconnect is low) |
•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.
•Reset ALERT Flash code by removing 24VAC power from module
•Last ALERT Flash code is displayed for 1 minute after module is powered on.
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