HPS
Heat Siphon
High Pressure Switch Open
Display shows “HPS”; unit starts then quickly shuts 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
Tripped high‑pressure switch due to poor water flow, Dirty condenser coil, Failed high‑pressure switch
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing pressure switches.
- Restore water flow: Confirm pump operation, open valves, and clean filters as with HP errors.
- Clean air coil: Remove debris from the condenser coil and ensure unobstructed airflow.
- Reset switch: Some high‑pressure switches are manual reset. If accessible, press the reset button after correcting the cause. Do not repeatedly reset without fixing the underlying issue.
- Replace if faulty: If the switch remains open with normal pressures (technician measurement), replace the high‑pressure switch.
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Repair Difficulty
Hard
4/5
Required Part
High Pressure Switch
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