MAINTENANCE WITH Q&A
Page 5-5
GENERAL TROUBLESHOOTING
Table 2. General Troubleshooting Procedures, Continued
PROBLEM PROBABLE CAUSE CORRECTIVE ACTION
R-508B Head
Pressure too
low
Refrigerant shortage Repair leak and recharge
R-404A Head
Pressure too
high
Condensing air too warm Maximum condenser inlet air = 80°F
Restricted air cooled condenser Clean condenser
Air in system Recover, evacuate and recharge
R-404A Head
Pressure too
low
Condensing air too cold Location may need to be changed
Low refrigerant charge Repair leak & recharge
Noisy unit Insuf! cient compressor oil Consult Cincinnati Sub Zero
Fan Check blades
Tubing rattle Bend tubes away from contact
Compressor mounting Tighten
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