Display flashes "FLO" (FLOW)
-This indicates that there is a water flow problem or defective pressure switch.
-You may have an air lock at the heater barrel. See page 11 for priming the pump.
-Make sure filters are clean
-Check that service valves are open
-Ensure water level is at water line
-Check for obstruction of flow
Display flashes "FLC"
-This indicates that the flow switch is stuck in the closed position and should be replaced.
Erratic operation at topside panel
-Shut off system and restart
-Check for debris inside topside panel control housing
-Check cable connection at the topside control, remove, clean and reconnect
-Try new topside control
No heat
-Check the topside control for "HL". This indicates that the system has overheated. Make sure the temperature has fallen to less than 112° F and press the heat key to reset.
-Check that the temperature set point is higher than actual tub temperature.
-Check for flashing LED at topside control to indicate heat demand
-Check to see if the pilot light at the equipment panel is on. This indicates if power is actually getting to the heater element. If this light is on and there is still no heat, the element should be checked for continuity. If there is no continuity, the element needs to be replaced.
Overheat
-If the water is too hot and the high limit has tripped the breaker, the water must be allowed to drop to less than 112° F before it will reset. Reset by pressing the heat key at the topside control.
-The circulation of the water may be too low, allowing the heater body to overheat. Be sure that all valves are fully open to allow maximum water flow over the heater element.
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