Hussmann USL-2, Installation And Service Instructions Manual

Page 11 

Compressor runs continu-
ously, product too cold 

1.  Defective control 

1.  Replace 

2. Control feeler tube not in 
positive contact 

2.  Assure proper contact 

3.  Short on refrigerant 

3.  Leak check, change drier, 
evacuate and recharge 

Compressor will not start no 
noise 

1.  Blown fuse or breaker 

1.  Replace fuse or reset 
breaker 

2.  Defective or broken wiring   2.  Repair or replace 

3.  Defective overload 

3.  Replace 

4.  Defective temperature con-
trol 

4.  Replace 

5.  Power disconnected 

5.  Check service cord or wir-
ing connections. 

Compressor will not start cuts 
out on overload 

1.  Low voltage 

1.  Contact electrician 

2.  Defective compressor  

2.  Replace 

3.  Defective relay 

3.  Replace 

4.  Restriction or moisture 

4.  Leak check, replace drier, 
evacuate and recharge 

5.  Inadequate air over con-
denser 

5. Clean condenser 

6.  Defective condenser fan 
motor 

6.  Replace 

7.  CRO not set properly 

7.  Reset to 12 psi on USL-2 

Icing condition in drain pan 

1.  Low voltage 

1.  Check voltage at compres-
sor 

2.  Cabinet not level 

2.  Check front to rear level-
ing, adjust legs accordingly