© 2011 Pentair Technical Products
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TROUBLE SHOOTING AC Units
Basic Trouble Shooting Check List
1. Check manufacturer’s nameplate located on the unit for correct power supply.
2. Unit blows fuses or breakers.
• Under sized fuse/breaker or not time delayed
• Short in system
Repair or Replace
defective part
3. Turn on power to the unit. The enclosure air mover should come on. Is there airflow?
YES, proceed to step 4.
NO, possible problem:
• Open motor winding
• Stuck air mover motor
• Obstructed wheels/blades
Repair or Replace
defective part
4. Check thermostat setting? Adjust thermostat to the lowest setting. This should turn both air movers
on. Did both air movers come on when the thermostat was turned down?
YES, proceed to step 5.
NO, possible problem:
• Defective thermostat
Replace part
5. Are both air movers running? If not, the unit will not cool properly.
6. Check ambient air mover for airflow. Is there airflow?
YES, proceed to step 7.
NO, possible problem:
• Defective thermostat
• Open motor winding
• Stuck air mover motor
• Obstructed wheels/blades
Repair or Replace
defective part
7. To check for a bad thermostat, turn off power to the unit. Remove access cover and place both
thermostat wires onto one terminal (replace access cover for safety). This will bypass the switch in the
thermostat. Turn on power to the unit and if both air movers come on, the thermostat needs to be
replaced.
For additional technical information (i.e., amp draw, temperatures) , contact Pentair Technical
Products at 800-896-2665.
