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3 - Troubleshooting
3.1 Fault Codes
A fault code indicates a specific issue or condition that will require action before the equipment can resume
operating.
Please perform the following troubleshooting.
If the issue reoccurs, please
see "Contacting AquaCal AutoPilot, Inc." on page 1.
WARNING
Failure to heed the following may result in injury or death.
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Repairs must not be attempted by untrained or unqualified individuals.
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The chiller contains refrigerant under high pressure. Repairs to the refrigerant circuit must not be attempted by
untrained or unqualified individuals. Service must be performed only by qualified HVAC technicians. Recover
refrigerant before opening the system.
NOTICE
Failure to heed the following may result in damage to equipment.
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Service by unauthorized personnel will void the chiller warranty.
FLO
Indicator
ISSUE
Low or no water detected.
RESOLUTION
1. Confirm the filter pump is on.
2. If a multiple-speed filter pump is being used, run at a higher speed to determine if the error persists. Do not
exceed maximum flow rate for your model.
3. Confirm water is not being diverted away from the chiller.
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See "Water Flow Rates" on page 9.
FS
Indicator
ISSUE
The chiller has sensed the evaporator coil is icing up.
RESOLUTION
Cool Only Units
When ice starts to form on the coil, the compressor will stop operating while the fan continues to operate.
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When the coil's temperature rises above 38° F, the compressor is restarted and cooling resumes.
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If the coil's temperature remains below 38° F, the compressor will remain off.
CEr
Indicator
ISSUE
This can indicate a loose or damaged communication cable.
RESOLUTION
A qualified technician should check the cable from control board to display assembly for a loose connection or
visible damage.
