11
TROUBLESHOOTING CHECKLIST
1.
Check to be sure that the electrical power is on. Reset the breakers or replace fuses if necessary.
2.
Check to be sure the electronic control panel is set properly. The unit must be in either the Pool or Spa
mode and the desired temperature must be set above the actual pool or spa temperature for the heater to
run. If an error code is displayed, reference the table below to determine the cause.
3.
Check to make sure the evaporator coil has enough clearance and that there are no restrictions to its
airflow.
4.
Certain ambient air conditions may cause the heater to go into defrost mode. The Defrost mode will be
indicated by the Defrost LED.
NOTE: IT IS NORMAL FOR WATER TO DRIP FROM THE DRAINHOLES AT THE BASE OF THE HEATER.
THE UNIT PRODUCES CONDENSATE WHEN IT OPERATES.
The following table lists error codes as they would appear on the electronic control display. In the event
that an error does occur, check the possible causes list for the corresponding error to correct the problem.
Error Code
Description
Possible Causes
F1
Internal Flow Switch Open
Little or no water flow
The pump is not running
The filter is dirty or clogged
Shortage of water to pump, air leak
Undersized pump
Valves not in correct position
Filter in backwash mode
Water pressure switch needs adjustment or is defective
FS
Internal Flow Switch Open Remote
Mode
Same as above
HP
High Pressure Switch Open
Low water flow to heater
Defective high-pressure switch
LP
Low Pressure Switch Open
Evaporator coil is dirty
Fan motor not running
Low refrigerant pressure
Defective low pressure switch
PO
Water Thermistor Open
Loose sensor wire
Defective water thermistor
HC
Water Thermistor Closed
Wire terminals touching
Defective water thermistor
dO
Defrost Sensor Open
Loose sensor wire
Defective defrost sensor
Dc
Defrost Sensor Closed
Wire terminals touching
Defective defrost sensor
bO
Control Voltage Below 18VAC
Low supply voltage to the unit
