Service Instructions

1.High head pressure and high back pressure:

A.Condenser coil clogged or restricted

B.Condenser fan motor defective.

C.Air discharge in rear of cabinet restricted.

2.Low back pressure and low head pressure:

A.Restriction in system.

B.Refrigerant undercharged.

C.Leak in system

3.Pressure normal – cabinet warm:

A.Coil blocked with frost (see #4).

B.Refrigerant undercharged.

C.Control set too warm.

4.Cabinet not cycling – coil blocked with frost:

A.Defective temperature controller.

B.Refrigerant overcharged.

C.Location too hot.

D.Condenser clogged.

E.Condenser fan motor defective.

5.Compressor starts and runs – but cycles on overload:

A.Low voltage

B.Relay defective.

C.Overload defective.

D.High head pressure (see #1).