PSo
Everlast Spas
Pressure Switch Stuck Open
Display shows PSo or PSO and spa may not start heating cycle.
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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
No water flow through heater, Failed circulation pump, Severely clogged filter, Defective pressure switch
How to Fix / Troubleshooting
Safety first: Turn off power before servicing pumps or plumbing.
- Verify pump operation: Confirm that the Everlast circulation pump or low-speed jet pump runs when a heat call is present. Replace the pump if it hums but does not move water.
- Clean filter and skimmer: Remove debris from the skimmer basket and clean or replace the filter cartridge.
- Bleed air: After refilling, bleed air from the pump and heater unions until water flows steadily.
- Test pressure switch: With good flow confirmed, test the pressure switch for continuity. Replace if it remains open under flow.
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Repair Difficulty
Medium
3/5
Required Part
Pressure Switch
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