PSo
RivieraPool
Pressure Switch Open When Should Be Closed
Display shows PSo or PSO and spa may not start heater or may shut down.
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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
Low water flow, Faulty pressure switch stuck open, Airlock in plumbing, Incorrect switch calibration
How to Fix / Troubleshooting
Safety: Disconnect power before adjusting or replacing the pressure switch.
- Check water level and filter: Ensure proper water level and clean the RivieraPool filter cartridge.
- Bleed air: Loosen pump or heater unions slightly to release trapped air, then retighten.
- Inspect switch: Locate the RivieraPool pressure switch and verify that its tubing (if present) is not kinked or blocked.
- Test operation: With the pump running, gently tap the switch body. If the error clears temporarily, the internal contacts may be sticking.
- Replace if needed: Install a new RivieraPool pressure switch if PSo persists despite good flow and no airlocks.
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Repair Difficulty
Medium
3/5
Required Part
RivieraPool pressure switch
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