Aquacal SQ120R Instruction Manual page 36

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.
CSE Indicator
ISSUE
This is a control system error.
RESOLUTION
Deactivate then reactivate power to reset controls.
dpC or dPO Indicator
ISSUE
Shorted or open defrost sensor.
RESOLUTION
A qualified technician should replace the defrost sensor.
pC or pO Indicator
ISSUE
Shorted or open water sensor.
RESOLUTION
A qualified technician should replace the water sensor.
HP Indicator
ISSUE
The refrigerant system's high-pressure switch is showing as open.
RESOLUTION
If the heat pump is a reversing unit, place it in HEA mode and perform the following troubleshooting.
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 heat pump.
See "Water Flow Rates" on page 6.
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See "Adjusting Water Flow Using ΔT (Delta-T)" on page 16.
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4. The water pressure switch may be incorrectly calibrated. See "Adjusting Water Pressure Switch" for more
information.
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