Water Motor Pump Failure & Pipe Leakage: How to Troubleshoot

Why Does the Water Motor Run But Fail to Lift Water?

In Dhaka multi-story residential buildings, water motor pumps (centrifugal or submersible) work hard daily to transfer WASA reserve water up to rooftop storage tanks.

When the motor turns on and hums normally but no water reaches the roof, here are the top reasons:

1. Air Lock in Suction Pipe (এয়ার লক বা বাতাস ঢোকা) Centrifugal pumps require the suction pipe to be completely filled with water (primed) before they can create suction. If the underground reserve tank water level dropped below the foot valve or a small pipe joint leaked air, the pump loses its prime. * **Solution:** Open the priming plug on top of the pump housing, pour water until it overflows, seal tightly, and restart.

2. Damaged Foot Valve (ফুট ভালভ নষ্ট) The check valve / foot valve sits at the bottom of the underground water tank. If dirt or rust prevents the rubber flap from sealing, all water in the vertical suction pipe drains back into the underground reservoir every time the pump stops. * **Fix:** A plumber must pull up the suction pipe and install a brass foot valve with fine strainer mesh.

3. Worn-Out Impeller or Broken Shaft Over time, sand and abrasive grit in groundwater erode the brass or plastic impeller vanes inside the pump chamber. The motor still spins at full RPM, but it cannot generate enough hydraulic head pressure to push water up 5 or 6 floors. * **Fix:** Dismantle pump head and replace the impeller.

How to Handle an In-Wall Concealed Pipe Leak

If you notice damp wall plaster, peeling paint, or mold near the bathroom or kitchen wall: 1. Turn off the main overhead tank valve immediately to stop pressurized water from feeding the leaking line. 2. Avoid drilling holes blindly into the wall. Modern plumbers use moisture meters or acoustic leak detectors to pinpoint the leaking elbow or socket. 3. Replace old GI (galvanized iron) pipes with heat-welded PPR or CPVC pipes, which never corrode or collect calcium scale.

Standard Plumbing Costs in Dhaka

• Water Tap / Angle Stop Cock Replacement: ৳250 – ৳350
• Commode Flush Fitting / Syphon Repair: ৳500 – ৳800
• Water Pump Motor Mechanical Overhaul: ৳799 – ৳1,500
• Concealed Wall Pipe Repair & Masonry: ৳800 – ৳1,800

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