Sta-Rite Flow Interruption with Spa Mode

Heater runs briefly and then shuts off when spa jets are turned on

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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

Improper valve positioning, Spa suction drawing air, Undersized plumbing, Pressure switch sensitivity

How to Fix / Troubleshooting

Safety: Do not operate the heater with known flow issues; overheating can occur.

  • Verify valve positions: Ensure that when spa mode is selected, valves are correctly directing full flow through the Sta-Rite heater.
  • Check for air entrainment: Look for air bubbles in the pump basket when jets are on. Correct suction-side leaks.
  • Increase pump speed in spa mode: Program higher RPM when spa is active to maintain adequate heater flow.
  • Adjust or replace pressure switch: If minor flow changes cause shutdown, consider adjusting or replacing the Sta-Rite pressure switch.
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Repair Difficulty

Medium 3/5

Required Part

Water Pressure Switch
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