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Why Is My Pump Running Constantly?
A pump that never shuts off can indicate a pressure problem, a failing valve, or a leak in your system that prevents it from reaching the shutoff threshold.
Your reverse osmosis system's pump is designed to run only when needed, pressurizing the system and then shutting off once the storage tank is full. If your pump keeps running without stopping, something is preventing the system from reaching its normal shutoff pressure. Addressing this promptly protects your equipment and saves water and energy.
Why Constant Running Is a Problem
A pump that runs continuously isn't just annoying, it causes real issues:
- Pump wear: The pump motor is rated for intermittent use. Constant operation generates excess heat and dramatically shortens its lifespan.
- Energy waste: Your electricity bill will climb as the pump draws power around the clock.
- Water waste: If the system can't pressurize, water continuously flows to drain rather than filling your tank.
Common Causes
Check valve leak
Check valves ensure water flows in one direction. If one fails, water drains back from the tank, and the pump never senses adequate pressure to shut off.
Auto-shutoff valve failure
The automatic shutoff valve (ASO) is designed to stop the pump when tank pressure reaches a certain level. A worn or stuck ASO valve won't signal the pump to turn off, causing it to run indefinitely.
Low tank pressure
Your storage tank contains an air bladder that should be pre-charged to 7-8 psi when empty. If this pressure drops too low, the system struggles to build backpressure, and the shutoff mechanism never engages.
Pressure switch malfunction
The pressure switch monitors system pressure and tells the pump when to stop. A faulty switch may fail to register that shutoff pressure has been reached.
System leak
Any leak in tubing, fittings, or the membrane housing allows pressure to escape, preventing the system from reaching shutoff pressure.
Troubleshooting Steps
Work through these checks to identify the cause:
- Check for visible leaks: Inspect all tubing connections, filter housings, and fittings for drips or moisture. Tighten any loose connections.
- Test tank pressure: Close the tank valve and drain any water from the tank. Use a low-pressure gauge on the air valve to check the bladder pressure—it should read 7-8 psi when empty.
- Inspect the auto-shutoff valve: Close the tank valve and observe the system. If the pump continues running rather than shutting off within a few minutes, the ASO valve may need replacement.
- Evaluate check valves: Listen for water flowing backward when the pump stops. If you hear gurgling or draining sounds, a check valve may be leaking.
- Test the pressure switch: If you've ruled out other causes, the pressure switch itself may need testing or replacement.
When to Contact Support
If you've worked through these steps and your pump still runs constantly, or if you're uncomfortable performing any of these checks, our support team is here to help. We can walk you through additional diagnostics or arrange for replacement parts if needed.
