repair · Pan-India

Water Purifier Repair: Common Faults, Causes & Costs

The short answer

No water at all: Inlet valve closed, no power, SMPS failure, or Pureit safety lock — ₹0 - ₹1,400
Very slow flow: Clogged sediment/carbon filter, low input pressure, fouled membrane — ₹150 - ₹3,500
Water tastes or smells bad: Exhausted carbon filter or tank biofilm — ₹250 - ₹800
In order of likelihood: the inlet valve is partly or fully closed, there is no power reaching the unit (check the socket and adaptor LED), input water pressure is below the minimum the pump needs, the sediment pre-filter is completely clogged, or the SMPS/adaptor has failed. If it is a Pureit that stopped abruptly, the germkill kit has expired and the safety lock has engaged by design.
Most commonly a perished or displaced o-ring in a filter housing, frequently after a recent service where the housing was over-tightened and crushed the seal. Other causes are a cracked housing, a loose tube fitting, or a failed tank bladder.

Most water purifier faults have a small number of likely causes, and knowing which is which before you call has two benefits: you can sometimes fix it yourself in five minutes, and when you cannot, you can describe the symptom accurately enough that the technician brings the right part.

Work through the diagnostic table below before booking a visit. The number of 'faults' that turn out to be a closed inlet valve, a tripped socket or a clogged sediment filter is genuinely high.

Indicative charges

Symptom	Likely cause	Indicative repair cost
No water at all	Inlet valve closed, no power, SMPS failure, or Pureit safety lock	₹0 - ₹1,400
Very slow flow	Clogged sediment/carbon filter, low input pressure, fouled membrane	₹150 - ₹3,500
Water tastes or smells bad	Exhausted carbon filter or tank biofilm	₹250 - ₹800
Output TDS high	Degraded membrane or seal bypass	₹1,200 - ₹3,500
Purifier runs continuously	Faulty float valve, leaking tank, failed auto-cut-off	₹400 - ₹1,500
Leaking from housing	Perished o-ring or over-tightened housing	₹100 - ₹500
Noisy pump	Air lock, worn pump, or dry running	₹1,200 - ₹2,500
UV indicator off	Failed lamp or ballast	₹500 - ₹1,800

These are indicative market ranges across India, useful for sanity-checking a quote. Actual charges vary by city, brand and whether parts are genuine or third-party. Franchisee pricing for the same service differs meaningfully between cities — always get the quote in writing before work starts.

Check these five things before calling anyone

Is the inlet tap fully open? Partially closed inlet valves are the single most common 'fault'.
Is the power socket live, and is the adaptor LED on? Test the socket with something else.
Is your building's water pressure adequate? Most RO units need roughly 5 psi minimum and will not start below it.
When did you last change the sediment filter? A clogged pre-filter mimics almost every flow-related fault.
If it is a Pureit and it has stopped completely, the germkill kit has almost certainly expired and the safety lock has engaged. That is intentional, not a fault.

Important

Switch the unit off at the socket and close the inlet valve before opening any filter housing. And do not over-tighten housings on reassembly — a crushed o-ring is the most common cause of a leak that appears immediately after a service.

Faults worth fixing versus units worth replacing

A purifier is worth repairing when the fault is a consumable, a pump, an SMPS, a valve or a lamp — all of which are individually replaceable at modest cost on any mainstream unit.

Consider replacement instead when the unit is over eight to ten years old and needs a membrane plus pump plus tank together, when spares for the model are discontinued, or when the tank has developed a persistent smell that sanitisation does not resolve. At that point you are spending half the price of a new purifier on a machine with a limited remaining life.

Frequently asked questions

Why is my water purifier not giving water?

In order of likelihood: the inlet valve is partly or fully closed, there is no power reaching the unit (check the socket and adaptor LED), input water pressure is below the minimum the pump needs, the sediment pre-filter is completely clogged, or the SMPS/adaptor has failed. If it is a Pureit that stopped abruptly, the germkill kit has expired and the safety lock has engaged by design.

Why is my RO purifier leaking?

Most commonly a perished or displaced o-ring in a filter housing, frequently after a recent service where the housing was over-tightened and crushed the seal. Other causes are a cracked housing, a loose tube fitting, or a failed tank bladder. Close the inlet valve, switch off the power, and identify which joint is wet before calling — it makes the repair much faster.

Is it worth repairing an old water purifier?

Yes if the fault is a single replaceable component — filter, membrane, pump, SMPS, valve or lamp. Consider replacing instead if the unit is over eight to ten years old and needs several major parts together, if spares are discontinued for the model, or if the tank retains a smell after sanitisation. Repairs approaching half the cost of a new unit rarely make sense on an old machine.