AquaCal Excessive Flow Restriction Through Heater

Heater operates but causes noticeable drop in water flow to pool returns.

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.

Possible Causes

Internal scale buildup in heat exchanger, Partially closed bypass or isolation valve, Undersized plumbing to heater, Debris caught in AquaCal water manifold

How to Fix / Troubleshooting

Safety first: Turn off pump and heater and relieve pressure before opening plumbing.

Check valves: Ensure all valves around the heater are fully open and that any bypass is adjusted correctly.
Clean strainers: Remove and clean any internal strainers or screens in the heater manifold.
Descale (if applicable): For severe scale, a professional may need to chemically descale or replace the heat exchanger.
Verify plumbing size: Confirm that the installed pipe size meets AquaCal's minimum recommendations to avoid chronic restriction.

Repair Difficulty

Hard 4/5

Required Part

Heat Exchanger

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