Aquacal AutoPilot SP05, Installation Manual

Page: 68 / 89

Page - 64
HIGH PRESSURE FAULT
ISSUE
The refrigerant system’s high-pressure switch is showing as open.
RESOLUTION
Heat Only Units
Place heat pump in heating 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 the
maximum flow rate for the model.
3. Confirm water is not being diverted away from the heat pump.
l
See " Water Flow Rates " on page 14.
l
See " Adjusting Water Flow Using ΔT (Delta-T) " on page 15.
Heat and Cool Units (Reversing)
Place heat pump in heating 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 the
maximum flow rate for the model.
3. Confirm water is not being diverted away from the heat pump.
l
See " Water Flow Rates " on page 14.
l
See " Adjusting Water Flow Using ΔT (Delta-T) " on page 15.
HIGH WATER TEMPERATURE
ISSUE
Incoming water temperature has exceeded 110° F (43° C) and the unit has been deactivated. The heat
pump will not operate until the incoming water temperature drops to 100° F (38° C) or lower.
RESOLUTION
1. Determine if a gas heater is sending water directly to the heat pump. This situation would need to be
corrected before continuing.
2. If a solar heater is sending water directly to the heat pump, the water can initially be hotter than 110° F
(43° C). After the water from the solar panel normalizes, the fault will no longer display and the heat pump
will resume as needed.
3. If the HIGH WATER TEMPERATURE fault continues to display, the water temperature sensor may
require replacement.
HP5 SYSTEM LOCKOUT
ISSUE
The heat pump has locked due to five high-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 high-pressure issue causing the error.
l
See " HIGH PRESSURE FAULT " above.
2
-
T
roubl
es
hoot
ing