ACV Recirculation Circuit Failure

DHW recirculation loop not maintaining temperature, long wait for hot water at distant taps

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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

Failed ACV DHW recirculation pump, Stuck non-return valve, Incorrect timer or control settings, Air lock in recirculation line

How to Fix / Troubleshooting

Safety: Allow pipes to cool before handling. Isolate power to the recirculation pump.

  • 1. Check pump operation: Verify that the DHW recirculation pump runs according to schedule or demand. Listen for operation and feel for vibration.
  • 2. Timer/settings: Confirm that any time clocks or controllers for the recirculation pump are correctly set and not in OFF mode.
  • 3. Non-return valve: Inspect and, if necessary, replace the check valve in the recirculation line to ensure correct flow direction.
  • 4. Bleed air: Open high-point vents or temporarily crack a union to release trapped air, then retighten.

If the pump is seized or noisy, replace it with an ACV-approved DHW recirculation pump.

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Repair Difficulty

Medium 3/5

Required Part

DHW Recirculation Pump
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