| Questions |
Cause |
Remedy |
| How long do the doors stay open? |
Service load to high |
Keep doors closed |
| Is the condenser clean? |
Dirty condenser |
Clean condenser |
| Are the condenser fans running? |
Fans not running |
Repair or replace |
| Is the evaporator dirty or iced up? |
Iced or plugged evaporator coil |
Defrost or clean |
| Are the evaporator fans running? |
Fans not running |
Repair or replace |
| Have you checked the refrigerant level? |
Shortage of refrigerant |
Repair leak and recharge |
| Is there air or other non-condensables in the system? |
Non-condensables in the system |
Remove from the system |
| Are all controls functioning properly? |
Control contacts have frozen |
Clean points or replace control |
| Have you checked expansion valve? |
Plugged expansion valve or retainer |
Clean or replace |
| What is Evaporator Superheat? |
Evaporator Superheat too high |
Adjust expansion valve to lower Superheat setting |
| Where is condensing unit located? |
Location too warm |
Ventilate area or change to cooler location |
| Is box well sealed from air penetrations? |
Wall panels not locked or wall penetrations not sealed |
Lock panels, seal penetrations or replace |
| Is system capacity sufficient for product load? |
Product load greater than system capacity |
Add additional units or replace |
