PSoC
Artesian Spas
Pressure Switch Open Circuit (for older pressure-switch systems)
Display shows PSOC or PS and pumps will not start
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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
Open or failed pressure switch, Low water flow through heater, Disconnected pressure switch wiring
How to Fix / Troubleshooting
Safety: Turn off power at the GFCI breaker before working on the pressure switch or plumbing.
- Locate pressure switch: On some Artesian models with older control packs, a pressure switch is threaded into the heater manifold with two small wires.
- Check wiring: Ensure both wires are firmly attached and not corroded or broken.
- Verify water flow: Clean filters, check water level, and confirm the pump is moving water through the heater.
- Adjust or replace: Some pressure switches are adjustable; a small turn of the adjustment screw can restore proper operation, but over-adjustment can defeat safety. If in doubt, replace the switch with an Artesian-compatible part.
Never bypass a pressure switch permanently; it is a critical safety device.
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Repair Difficulty
Medium
3/5
Required Part
Heater Pressure Switch for Artesian Spas
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