VAL
Fafco
Solar Valve Actuator Fault
Controller displays VAL or VALVE ERROR; solar valve does not move or stops mid-position.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed Fafco valve actuator motor, Stripped actuator gears, Jammed diverter valve, Incorrect actuator wiring to controller
How to Fix / Troubleshooting
Safety: Turn off power to the Fafco controller and pump before working on the valve actuator or plumbing.
- Check manual operation: Remove the actuator from the valve body (usually by loosening a few screws). Manually turn the valve stem with a wrench or handle. It should rotate smoothly 90°. If it binds, the valve body is jammed and must be serviced or replaced.
- Inspect actuator: With the actuator removed, gently rotate the output shaft by hand. Grinding or free-spinning may indicate stripped gears.
- Verify wiring: Open the actuator cover and confirm that the common, open, and close wires are correctly connected to the Fafco controller terminals per the wiring diagram.
- Test movement: Restore power and command solar ON/OFF while watching the actuator (off the valve). If it does not move or only hums, the motor or internal limit switches are likely failed.
- Replace actuator if needed: Install a Fafco-compatible solar valve actuator, align it with the valve stem in the correct position, and secure with screws. Reconnect wiring and test full travel.
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Repair Difficulty
Medium
3/5
Required Part
Fafco Solar Valve Actuator
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