At initial power up, each Heatcraft Quick Response Controller board checks for system errors. The system error check involves checking the various temperature sensors to determine whether any of these sensors are shorted or open.

 

The system will pumpdown and cycle off and will not restart until the fault is cleared or the circuit breaker reset, for the following conditions:

 

- Suction sensor shorted, open or not installed

- Room temperature sensor shorted or not installed

- Pressure Transducer open or not installed

 

The system will pumpdown, cycle off and try to restart for these faults. Each try will be after the 4 minutes "Hold Off" period, for the following fault conditions:

 

- High pressure or low pressure cutout

- Oil pressure

 

After the fourth try, the Alarm contacts will be closed and an alarm message displayed on the LED. To clear this condition, the system should be cycled through the "SERVICE MODE" after the correction is completed.

 

 

E1 - Room temperature sensor shorted, open or not installed

E2 - Defrost temperature sensor shorted, open or not installed

E3 - Suction temperature sensor shorted, open or not installed

E4 - Suction pressure transducer shorted, open or not installed

E5 - Outdoor temperature sensor shorted

E6 - Low superheat

E7 - Compressor shut down (high or low pressure switch open or oil pressure switch open) E9 - Multi-in/multi-out wiring error