Pentair
No Power to Heater
Heater will not start at all; display is blank and no lights or sounds are present.
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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 circuit breaker, Loose line voltage connection at heater, Failed internal fuse on control board, Faulty power switch
How to Fix / Troubleshooting
Safety: Always turn off power at the main breaker before opening the heater’s electrical compartment.
- Check breaker and GFCI: Verify the dedicated breaker for the heater is ON and any GFCI outlets or breakers in the circuit are not tripped. Reset if necessary.
- Inspect line wiring: Remove the access panel and confirm that line (L1/L2) wires are securely attached to the heater’s terminal block. Tighten loose screws.
- Test incoming voltage: With a multimeter (technician recommended), confirm correct voltage at the heater terminals. If no voltage is present, the issue is upstream (breaker, wiring).
- Check internal fuse: Many Pentair heaters have an internal low-voltage fuse on the control board. Inspect and replace with the exact same rating if blown. If it blows again immediately, a short exists and requires professional diagnosis.
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Repair Difficulty
Medium
3/5
Required Part
Internal Control Fuse
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