Hayward Flow Interruption Due to Valve Operation

Heater shuts off when spa jets are turned on or when valves change position.

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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

Valve actuators mis-synced, Plumbing not maintaining minimum flow through heater, Incorrect actuator cam settings, Shared pump with insufficient flow in certain modes

How to Fix / Troubleshooting

Safety First: Turn off power to automation and heater before adjusting actuators.

  • Observe valve positions: Switch between pool and spa modes and watch actuator movement. Ensure that in all heating modes, water still flows through the heater.
  • Adjust actuator cams: On Hayward actuators, set the stop cams so valves do not fully bypass the heater when spa jets are on.
  • Check pump speed: Increase pump RPM when spa mode is active to maintain adequate flow through the heater.
  • Test heater: After adjustments, run the spa with jets on and confirm the heater stays on without LO/FLO errors.
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Repair Difficulty

Medium 3/5

Required Part

Valve Actuator
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