NUBE Bomba de recirculación SS30

How to Know if Your Reflux Pump Is Weak or Jammed

If the water from the cold-water tank is coming out more slowly than usual, your reflux pump may be getting weak or partially jammed.

The reflux pump is responsible for generating pressure when dispensing cold water. While your unit is designed to allow water to flow by gravity (in case you have no power or prefer to turn it off for a few hours for silence), when the unit is on, the pump pushes the water out with pressure—allowing you to fill a glass or jar much faster.

Over time, natural minerals and sedimentation from the water produced by NUBE gradually accumulate inside the pump, causing it to lose strength. Its average lifespan is around 4–6 years, although certain factors can cause it to wear out or seize earlier, such as:

• Lack of weekly cleaning – leading to small particles settling inside the reflux pump.
• Leaving the unit turned off for more than 2 days – minerals such as magnesium tend to crystallize and harden inside the hoses. When moisture returns, these crystals release particles that block the proper function of the pump.
• Delays in replacing spare parts – such as the filter kit or UV lamps. This may cause contamination at the bottom of the tank, which the reflux pump eventually absorbs, obstructing its normal operation.
  Before replacing the pump, we recommend performing a full reflux cleaning cycle, as this often restores normal operation and extends the pump’s service life.

If the issue persists after cleaning, pump replacement will be necessary.