DURUB WATER SOLUTIONS – Pump Control & Diagnostics Team
1. Introduction
The most common pump complaint in UAE villas is:
“My pump keeps turning on and off every few seconds with no taps open.”
This is called cycling, and it destroys pumps faster than anything else:
Motor overheating
Bearing wear
Faster impeller damage
High electricity usage
Noisy operation
Short pump lifespan
Cycling is extremely common in UAE because of the combination of tank contamination, poor piping work, water heater backflow, and weak NRVs.
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2. The Real Causes of Pump Cycling in UAE Homes
1. Minor Hidden Leak in the System
A very small leak—in toilet float valves, mixers, or buried pipes—can cause pressure to drop slowly.
When pressure drops → pump starts → pressure rises → pump stops → leak lowers it again → pump starts…
This loop continues endlessly.
Symptoms:
Pump starts every 10–40 seconds
No visible water leak
DURUB Solution:
Leak tracing
Mixer isolation test
WC valve replacement
Pipe inspection
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2. Faulty or Weak NRV (Non-Return Valve)
If the NRV does not close properly, water returns back to the tank or pipes.
This reduces pressure → triggers cycling.
Why common in UAE:
Low-quality brass NRVs
Rust buildup
Tank contamination
Heat expansion causing seal failure
DURUB Solution:
Replace with SS316 NRV
Re-align inlet/outlet piping
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3. Pressure Vessel Losing Air Charge
Booster systems rely on the air inside the pressure vessel to stabilize pressure.
If the air charge drops below 1.5 bar:
Pump loses stability
Pressure fluctuates
Cycling becomes constant
Signs:
Pump turns on/off very fast (every 5–10 seconds)
Vessel feels “full of water”
DURUB Solution:
Recharging with nitrogen or air
Vessel replacement if bladder is damaged
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4. Pressure Switch Problem
Faulty switches have wrong cut-in/cut-out settings, causing unstable operation.
DURUB Solution:
Recalibrate
Replace switch
Adjust pressure settings according to villa size
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5. Mixer Cartridge Backflow (Very Common)
Old mixers allow water to travel backwards inside the plumbing system.
This causes hidden pressure loss.
DURUB Solution:
Isolate mixers one by one
Replace faulty cartridges
Flush the valve bodies
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6. Hidden Pipe Cracks or Weak Fittings
Many villas in Sharjah/Dubai use poor-quality PPR fittings that crack with time.
Signs:
Damp patches in walls
Pressure slowly falling
Cycling only stops when main valve is closed
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3. DURUB Step-by-Step Diagnostic Method
Step 1 — Check pressure drop on gauge
If needle drops → cycling confirmed.
Step 2 — Test NRV
Let pressure build → close pump valve → observe for pressure drop.
Step 3 — Vessel Pre-Charge Test
Measure air pressure inside vessel.
Step 4 — Internal Fixtures Test
Isolate kitchen, bathroom, heater lines.
Step 5 — Switch Calibration
Verify cut-in (start) and cut-out (stop) pressure.
Step 6 — Leak Tracing
Visual + acoustic checking.
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4. DURUB Fix Packages
Standard Cycling Fix
New SS316 NRV
Pressure vessel recharge
Pressure switch calibration
System bleeding
Advanced Fix
New NRV
New switch
Leak tracing
Mixer flushing
Expansion tank inspection
Premium Upgrade
Replace old booster with a VFD system
Add 24–60L vessel
Eliminate cycling forever
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5. Conclusion
Ignoring cycling destroys pumps in weeks, not years.
DURUB offers fast, accurate diagnostics and full pump stabilization for villas across UAE.
📞 +971 54 238 8884
🌐 durubco.com