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LP
Indicator
ISSUE
The refrigerant system’s low-pressure switch is showing as open.
RESOLUTION
Determine if an insufficient amount of water is being supplied to the equipment.
1. Confirm the filter pump is on.
2. If a multiple-speed filter pump is being used, run filter pump at a higher speed. Do not exceed maximum flow rate
for the model.
3. Confirm water is not being diverted away from the chiller.
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See "Water Flow Rates" on page 9.
4. The water pressure switch may be incorrectly calibrated. See "Adjusting Water Pressure Switch" on page 10.
LP5
Indicator
ISSUE
The chiller has locked due to five
LP
(low-pressure) faults during one call for cooling.
RESOLUTION
1. Deactivate then reactivate power to the chiller to clear error.
2. Troubleshoot the low-pressure issue causing the error. See "LP Indicator" on page 30.
OtA
Indicator
ISSUE
Incoming water temperature exceeded 110° F and the unit is locked with an
OtA
over temperature alarm. The
chiller will not operate until incoming water temperature drops to 100° F or lower.
RESOLUTION
1. Determine if another heat source (gas heater, solar heater, etc.) is heating water being sent directly to the chiller
with the
OtA
indicator. This situation will need to be corrected before continuing.
2. Rule out an incorrect reading from the water temperature sensor. Verify existing water temperature with an
accurate thermometer. If chiller's sensor is inaccurate, the water temperature sensor may require replacement.
3.2 Issues and Resolutions
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 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 factory warranty.
Please perform the following troubleshooting.
For further assistance, please
