Pitco FiLL Error Code
Low liquid level — water level too low on units with the liquid level option; heat suspended while filling.
Source: PITCO/pitco_controller_error_codes.txt
What does Pitco FiLL mean?
FiLL on a Pitco Solstice controller means the water level is too low on units equipped with the liquid level option. The controller suspends heat while the tank fills or tops off, protecting the system from heating with insufficient liquid. On many appliances this is a normal transient during a fill cycle; only a persistent FiLL points to a float switch or level sensor problem. Not all appliances have this option.
Symptoms
- Display reads FiLL and heating is paused.
- Condition appears during tank filling or top-off and clears on its own.
- Heat stays suspended until the liquid level is restored.
- Persistent FiLL with the tank full points to a sensor fault.
Common causes
- Liquid level is genuinely low and the tank is filling or topping off.
- Float switch has failed and reports low level when the tank is full.
- Liquid level sensor is fouled or misreading.
- Wiring to the float switch or level sensor is loose or damaged.
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Diagnostic steps
Wait for the tank to fill
Allow the fill or top-off cycle to complete. FiLL is normal during filling and should clear once the liquid level is restored.
Confirm the liquid level option applies
Verify the appliance actually has the liquid level option, since not all units use this input and the fault is meaningless on those that do not.
Check the float switch if FiLL persists
If FiLL stays on with the tank full, inspect the float switch or liquid level sensor for sticking, fouling, or a stuck float.
Inspect sensor wiring
Check the wiring to the float switch or level sensor for loose connectors or damage that could make the controller read low level falsely.
When to call a professional
Call a Pitco-authorized technician if FiLL persists with the tank confirmed full, indicating a failed float switch or liquid level sensor rather than a normal fill cycle. Replacing and verifying a liquid level sensor or float switch on the affected models is best done by a technician who can confirm the level input reads correctly and the heat-suspend logic clears as designed.
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