LPS
AquaCal
Low Pressure Switch Open
Display shows LPS; heater will not run.
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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
Low refrigerant charge, Faulty low‑pressure switch, Loose wiring at switch, Extremely low ambient temperature
How to Fix / Troubleshooting
Safety first: Turn off power before testing the switch.
- Check ambient temperature: Confirm conditions are within AquaCal's operating range.
- Inspect wiring: Ensure the low‑pressure switch leads are secure and not corroded.
- Continuity test: With power off, test the switch. It should be closed when the system is at rest. Replace if it remains open.
- Refrigerant service: If the switch opens during operation, a technician must check refrigerant charge and system integrity.
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Repair Difficulty
Professional Required
5/5
Required Part
Low Pressure Switch
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