LOP
AquaCal
Low Pump Speed / Flow Detected
Display shows LOP or LOW PUMP; the heater will not run.
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Possible Causes
Variable-speed pump running too slow, Pump schedule not synchronized with heater demand, Flow switch calibration mismatch, Partially clogged skimmer or pump basket
How to Fix / Troubleshooting
Safety first: Turn off the heater before changing pump settings.
- Increase pump speed: On variable-speed pumps, raise the RPM during heating cycles to meet AquaCal's minimum flow requirement.
- Align schedules: Ensure the pump is scheduled to run at sufficient speed whenever the AquaCal heater is enabled.
- Clean baskets: Empty skimmer and pump baskets to restore full flow.
- Flow switch check: If flow is visibly strong but LOP persists, the flow switch may be misaligned or failing and should be inspected and/or replaced.
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Repair Difficulty
Easy
2/5
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