HPS
AquaCal
High Pressure Switch Open
Display shows HPS; unit shuts down on safety.
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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
Tripped high‑pressure switch due to poor water flow, Faulty high‑pressure switch stuck open, Wiring fault between switch and control board, Blocked condenser coil (on reversible/chiller models)
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing pressure switches.
- Reset condition: Improve water flow by cleaning filters and opening valves, then reset the unit if it has a manual reset for HPS.
- Check switch wiring: Inspect the two wires to the high‑pressure switch for damage or loose terminals.
- Continuity test: With power off and system depressurized, test the switch for continuity. If it remains open under normal conditions, replace it.
- Do not bypass: Never bypass the high‑pressure switch; it is a critical safety device.
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Repair Difficulty
Hard
4/5
Required Part
High Pressure Switch
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