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.

CLOCK LOW BATTERY

ISSUE

The real-time clock controller indicates a low battery condition.

The time will reset to factory default.

RESOLUTION

A qualified technician should replace the battery. The date and time will need to be reset on the heat pump after replacement.

DEFROST1 SENSOR OPEN or DEFROST2 SENSOR OPEN

ISSUE

Open defrost sensor.

RESOLUTION

A qualified technician should replace the defrost sensor.

DEFROST1 SENSOR SHORT or DEFROST2 SENSOR SHORT

ISSUE

Shorted defrost sensor.

RESOLUTION

A qualified technician should replace the defrost sensor.

ERROR AT PRIMARY UNIT

ISSUE

The heat pump is secondary to a primary heat pump that is displaying a fault code.

RESOLUTION

The error at the primary heat pump must be corrected before the secondary unit will resume operation.

HAYWARD VS PUMP FAULT

ISSUE

The heat pump has either lost communication with a connected Hayward circulation pump. Or the Hayward pump needs attention.

RESOLUTION

Check circulation pump documentation for a resolution for that product.

JANDY VS PUMP FAULT

ISSUE

The heat pump has either lost communication with a connected Jandy circulation pump. Or the Jandy pump needs attention.

RESOLUTION

Check circulation pump documentation for a resolution for that product.

PENTAIR VS PUMP FAULT

ISSUE

The heat pump has either lost communication with a connected Pentair water pump. Or the Pentair pump needs attention.

RESOLUTION

Check circulation pump documentation for a resolution for that product.

HIGH PRESSURE FAULT

ISSUE

The refrigerant system’s high-pressure switch is showing as open.

RESOLUTION

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.

Confirm the filter pump is on.
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.
Confirm water is not being diverted away from the heat pump.
- See "Water Flow Rates".
- See "Adjusting Water Flow Using ΔT (Delta-T)".
The water pressure switch may be incorrectly calibrated.
- See "Adjusting Water Pressure Switch (Select Units)".

HIGH WATER TEMP

ISSUE

Incoming water temperature has exceeded 108° F (42° 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

Determine if a gas heater is sending water directly to the heat pump. This situation would need to be corrected before continuing.
If the HIGH WATER TEMP 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

Deactivate then reactivate power to the heat pump to clear error.
Troubleshoot the high-pressure issue causing the error.
- See "HIGH PRESSURE FAULT".

HPC TEMP SYSTEM LOCKOUT

ISSUE

The heat pump's controller board is overheating.

RESOLUTION

A qualified technician should be contacted to correct the issue.

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.

Check for proper fan operation. If the fan is not operating, call for service.
Check for obstructed airflow around the heat pump.
- See "Clearances".
Check for a dirty or blocked evaporator coil.
- See "Cleaning Equipment After Installation".
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

Deactivate then reactivate power to the heat pump to clear error.
Troubleshoot the low-pressure issue causing the error.
- See "LOW PRESSURE FAULT".

MULTI-UNIT COMM FAULT

ISSUE

Secondary heat pump is not receiving a signal from the primary heat pump.

RESOLUTION

Confirm the primary heat pump is operating correctly. If, for example, no power is supplied to the primary heat pump, an error will appear on the secondary heat pumps.
Confirm the heat pump is properly connected and configured to a primary unit.
- See "Connecting Multiple Heat Pumps (Optional)".

NO POOL/SPA GROUP EXISTS

ISSUE

When pushing the POOL/SPA button, the heat pump displays the message "NO POOL/SPA GROUP EXISTS".

RESOLUTION

A POOL or SPA group is only created if a preset has been used. For simple systems with only one body of water, a preset is not required. See "Site Configuration Presets (Optional)" for more information.

SMART COMM FAULT

ISSUE

Heat Pump is not receiving a signal from an external controller using a smart connection point.

RESOLUTION

Confirm a smart external controller is being used.
- If not, set external controller mode to "none" instead of "SMART".
  - See "Configure for Smart Controller".
Confirm connection points from the external controller to the heat pump are correctly configured.
- See "SMART Controllers".
If using a smart external controller, confirm the controller is correctly set to send signals to the heat pump. See manuals or guides provided with the external controller.

WATER TEMP1 SENSOR SHORT or WATER TEMP1 SENSOR OPEN

ISSUE

Open or shorted water sensor.

RESOLUTION

A qualified technician should replace the water sensor. Until the sensor is replaced, the setpoint is limited to 96° F (35.5° C)

WATER TEMP2 SENSOR SHORT or WATER TEMP2 SENSOR OPEN

ISSUE

Open or shorted water sensor.

RESOLUTION

A qualified technician should replace the water sensor. Until the sensor is replaced, the setpoint is limited to 96° F (35.5° C)