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SERVICE INSTRUCTIONS (Trouble Shooting Guide)
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. Pressures normal – cabinet warm:
A. Coil blocked with frost or ice (see #4).
B. Refrigerant undercharged.
C. Control set too warm.
4. Coil blocked with frost or ice:
A. Defective temperature control.
B. Doors aren’t sealing when closed.
C. Evaporator fan motor defective.
D. Low voltage.
5. Compressor starts and runs – but cycles on overload:
A. Low voltage.
B. Overload protector defective.
C. High head pressure (see#1).
6. Compressor will not start – hums, but cycles on overload:
A. Low voltage.
B. Relay defective.
C. Overload defective.
D. High head pressure (see #1).
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