RO Repair in Kolkata: How to Diagnose, Fix, and Prevent the 10 Most Common Purifier Problems

RO Repair in Kolkata: How to Diagnose, Fix, and Prevent the 10 Most Common Purifier Problems

There is a particular frustration that comes with a malfunctioning RO purifier — especially on a hot Kolkata afternoon when all you want is a cold glass of clean water and nothing comes out of the tap. Most purifier problems have clear causes and straightforward fixes. The challenge is knowing what you are dealing with before you call a technician.

This blog walks you through the ten most common RO purifier problems in Kolkata, what causes them, how to identify them, and when to call for professional RO repair kolkata.

Problem 1: No Water Coming Out

Likely Cause: Closed inlet valve, blocked pre-filter, or low water pressure at the source.

How to Check: First, confirm the inlet valve under the sink is fully open. Then check if water is reaching the purifier at all. If inlet water is flowing but nothing comes out, the sediment pre-filter is almost certainly blocked solid.

Fix: Replace the sediment pre-filter. In Kolkata, this filter typically needs replacement every 3–4 months due to high source water turbidity. This is a simple job any RO service kolkata technician can complete in under 30 minutes.

Problem 2: Very Slow Water Flow

Likely Cause: Partially clogged membrane or pre-filter, low inlet pressure, or a failing booster pump.

How to Check: Time how long it takes to fill a one-litre bottle. Standard RO purifiers should fill it within 3–5 minutes. Anything slower indicates a restriction somewhere in the system.

Fix: Start with filter replacement. If flow remains slow after fresh filters are installed, the membrane or pump needs professional evaluation. Call for best RO service in kolkata if the problem persists post-filter change.

Problem 3: Purifier Runs Non-Stop Without Filling the Tank

Likely Cause: Faulty auto shut-off (ASO) valve or a punctured storage tank bladder.

How to Check: When the tank is full, the purifier should stop automatically. If it keeps running and draining water continuously, the ASO valve has failed. This wastes 10–20 litres of water daily.

Fix: ASO valve replacement — a standard RO repair kolkata procedure that typically costs ₹400–₹800 including parts.

Problem 4: Water Tastes or Smells Strange

Likely Cause: Exhausted post-carbon filter, biofilm in the storage tank, or a UV lamp that has stopped working.

How to Check: First, replace the post-carbon filter. If the taste problem persists, have the storage tank sanitised. If the smell is specifically musty or earthy, biofilm growth inside the tank is the most likely culprit.

Fix: Post-carbon filter replacement plus tank sanitisation. Any water purifier service kolkata provider should include tank sanitisation as a standard part of their service offering.

Problem 5: Purifier Making Loud Noise

Likely Cause: Air trapped in the system, a worn booster pump, or loose pipe connections.

How to Check: A gurgling sound after dispensing water is normal and harmless — it is simply air moving through the drain line. A constant grinding or rattling noise, however, indicates a pump issue.

Fix: Air-related noise resolves itself after a few days of regular use. Pump noise requires professional diagnosis from a qualified RO service in kolkata technician.

Problem 6: Water Leaking from the Unit

Likely Cause: Loose push-fit connectors, cracked filter housing, or worn O-rings.

How to Check: Dry the area around the purifier completely, then observe where water first appears. Trace it back to the source — it is almost always a fitting or housing connection.

Fix: Tighten push-fit connectors by hand. If the leak is from a filter housing, the O-ring needs replacement — a ₹50–₹100 part that any RO repair kolkata technician carries in their kit.

Problem 7: TDS of Purified Water Is Too High

Likely Cause: Failing RO membrane or a TDS controller set incorrectly.

How to Check: Use a TDS meter. Test your input water first, then your purified output. A healthy RO membrane should remove 85–95% of dissolved solids. If your output TDS is more than 20% of your input TDS, the membrane is failing.

Fix: Membrane replacement. This is the most significant expense in RO maintenance but is unavoidable when the membrane fails. Cost in Kolkata typically ranges from ₹1,200 to ₹2,500 for the membrane plus installation.

Problem 8: Yellow or Discoloured Water

Likely Cause: Rusting in old pipe connections inside the purifier, or a severely degraded sediment filter that has started shedding material.

How to Check: If the discolouration appears immediately after installation of new filters, it is likely flushing material from the new filter — normal and resolves after running 2–3 litres through the system. If it persists, call for best RO service kolkata immediately.

Fix: Complete internal inspection, pipe replacement if corroded, and full filter replacement.

Problem 9: Purifier Not Turning On

Likely Cause: Power supply issue, tripped circuit breaker, or a blown fuse inside the purifier.

How to Check: Confirm the power socket is working using another device. Check if the power adapter LED is lit. If neither resolves it, the internal fuse or transformer may have failed.

Fix: Electrical faults should always be handled by a professional. Do not attempt to open the electrical compartment yourself. Call for RO water purifier service kolkata for any electrical diagnosis.

Problem 10: Tank Fills But Water Pressure at Tap Is Very Low

Likely Cause: Low tank pressure — the internal bladder tank loses air pressure over time and needs to be recharged.

How to Check: Empty the tank completely, then use a pressure gauge on the tank's air valve (similar to a bicycle tyre valve). Standard RO tank pressure should be 6–8 PSI when empty. Anything below this causes weak flow at the tap.

Fix: Use a hand pump to re-pressurise the tank to 6–8 PSI. If the tank loses pressure again within a week, the bladder is punctured and the tank needs replacement.

When to DIY and When to Call a Professional

Issue	DIY Possible?	Call for RO Service?
Loose push-fit connector	Yes	Only if leak persists
Filter replacement	Yes (with right parts)	Recommended
Membrane replacement	No	Always
Pump noise or failure	No	Always
Electrical fault	No	Always
Tank repressurisation	Yes (with gauge)	If problem recurs
UV lamp replacement	Possible	Recommended

Conclusion

Most RO purifier problems in Kolkata follow predictable patterns tied to the city's water quality and climate. Knowing how to identify them early saves money, prevents health risks, and extends the life of your purifier significantly. For anything beyond basic filter checks, always rely on a certified RO repair kolkata technician from a reputable provider like RO Care India, Kent, Livpure, Doctor Fresh, or Aquaguard.