SPLO
SmartPool
Low line voltage detected
Display shows SPLO; heater will not start
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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
Undersized supply wiring to SmartPool heater, Loose electrical connections at terminal block, Low utility voltage, Failing transformer on control board
How to Fix / Troubleshooting
Electrical safety: Turn off power at the breaker before opening the electrical compartment. Use a multimeter only if you are trained.
- Inspect supply wiring: Remove the electrical access cover on the SmartPool heater. Check that hot, neutral, and ground wires are tight and not discolored or burned.
- Measure voltage (qualified persons only): With power on, verify that the heater is receiving the correct voltage (e.g., 120V or 240V as labeled). If voltage is low, contact an electrician.
- Check internal connections: With power off again, inspect the low-voltage harness from the transformer to the SmartPool control board for loose plugs.
- Reset and test: Restore power and see if SPLO clears. Persistent SPLO with correct supply voltage may indicate a failing transformer or control board, requiring professional service.
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Repair Difficulty
Hard
4/5
Required Part
SmartPool Control Transformer
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