PSc
MAAX Spas
Pressure Switch Closed When It Should Be Open
Display shows PSC; heater may run when it should not or spa may shut down with an error.
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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
Shorted pressure switch contacts, Misadjusted pressure switch, Wiring short, Control board input fault
How to Fix / Troubleshooting
Warning: A stuck-closed pressure switch can allow unsafe heater operation. Do not bypass this safety device.
- Power off: Turn off the spa at the breaker.
- Inspect wiring: Check the pressure switch wires for shorts or melted insulation.
- Test switch: Disconnect one wire from the pressure switch and measure continuity across the switch with a multimeter. With no pump running, the switch should be open (no continuity).
- Adjust or replace: If the switch is closed with no flow, adjust the set screw (if adjustable) or replace the switch with a MAAX-approved part.
- Board check: If a new switch behaves the same, the control board input may be shorted and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Pressure Switch
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