Low Pressure Fault; Lp5 System Lockout; Multi-Unit Comm Fault; Ota System Lockout - Aquacal GBB Series Operation Manual

LOW PRESSURE FAULT

ISSUE
The refrigerant system's low-pressure switch is showing as open.
RESOLUTION
Heat and Cool Units (Reversing)
Place heat pump in heating mode and perform the following troubleshooting.
1. Check for proper fan operation. If fan is not operating, contact AquaCal
2. Check for obstructed air flow around the heat pump.
See "Clearances" on page 27.
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3. Check for dirty or blocked evaporator coil.
See "Cleaning Equipment" on page 26.
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4. Check for signs of heavy ice buildup on the coil.

LP5 SYSTEM LOCKOUT

ISSUE
The heat pump has locked due to five low-pressure faults during one call for heating or cooling.
RESOLUTION
1. Deactivate then reactivate power to the heat pump to clear error.
2. Troubleshoot the low-pressure issue causing the error.
See "LOW PRESSURE FAULT" on page 35.
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MULTI-UNIT COMM FAULT

ISSUE
Slaved heat pump is not receiving a signal from the master heat pump.
RESOLUTION
1. Confirm master heat pump is operating correctly. If, for example, no power is supplied to the master heat
pump, an error will appear on the slaved heat pumps.

OTA SYSTEM LOCKOUT

ISSUE
A malfunction has occurred that could allow the water temperature to surpass a safe level. An installed
"Over Temperature Alarm" kit has disabled the system.
See "Over Temperature Alarm Kit" on page 45 for more information.
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RESOLUTION
Call for service.
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