A good share of purifier call-outs in Delhi end with a technician opening an inlet tap, plugging the adaptor back in properly, or holding up a sediment filter caked in silt. Those visits are avoidable, and even when they are not, arriving at the call with information changes the conversation completely.
This is a checklist, not a diagnosis. If you want the full symptom-to-cause map, our RO not working guide covers it.
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In this guide
1. Power and water — the two things it cannot work without
Between them these explain more “dead purifier” calls in Delhi than everything else put together.
- Is the socket live right now? Test it with a phone charger. Do not assume.
- Is the unit on an inverter line that dropped it during a cut? Common in NCR, and it makes a perfectly healthy machine look dead.
- Is the indicator light on? No light and no pump hum usually points at the plug-in adaptor or the socket, not at anything expensive inside.
- Is the inlet tap fully open? Trace the thin inlet tube back from the machine to its tap. Half-closed after someone cleaned under the sink is the classic.
- Is water available in the building at this hour? Check a normal kitchen tap. A purifier cannot make water it is not being given, and supply schedules are the reason it works in the morning and not the evening.
Watch out If the pump is howling with no water coming through,
switch the unit off at the socket until supply is back — running a pump dry for long periods
damages it.
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Everything here is free and all of it is useful to whoever you eventually call.
- Is the pump running at all? “Pump running but no water” and “pump silent” are completely different faults. Note which one you have.
- Is water going to the drain when the tank should be full and the unit idle? If yes, the shut-off is not closing and it is wasting water every hour — see our reject water guide.
- Follow every tube by hand, looking for a sharp kink or a tube crushed against the wall. Units get pushed back during cleaning and the tubing pays for it.
- Feel underneath and behind for damp. A weeping push-fit fitting is the commonest leak and the cheapest to put right.
- Note any new noise. A growl, a bang when it starts, gurgling, or endless cycling all mean different things — our RO noise guide matches the sound to the cause.
3. Filters, tank and the standing-water reset
Three checks that solve most flow and taste complaints without anyone opening the machine.
- When were the pre-filters last changed? If the honest answer is “I don’t remember”, that is very likely your answer. Delhi’s sediment load chokes them faster than the manual assumes — see when to change your RO filter.
- Drain the storage tank fully and let it refill. Free, takes minutes, and it clears stale taste after a holiday and air in the line after a supply cut.
- Compare the purifier water with a normal tap. If both taste the same, the problem is upstream in your supply or tank, and no cartridge will fix it. Our taste and smell guide works through where.
- Do a timed fill test if it is slow. Empty the tank, run it fifteen minutes, measure what it made. That number is worth more than any adjective — see RO not filling the tank.
4. What to have ready when you do call
Two minutes of preparation gets you a better visit and a shorter one.
- The make, model and rough age of the unit, and a photo of the machine with its tubing.
- Your input and output TDS readings if you have a meter, taken the same day. This is the single most useful number you can offer — our RO and drinking water tips explain why.
- When it was last serviced and what was changed, which is why writing the date on the housing in marker is such a good habit.
- The exact symptom in plain words: “pump runs, tank fills in six hours instead of two” is far better than “RO not working”.
- Ask for a free inspection and quote before any work starts, and ask to be shown any part that is replaced. If you rent, check whether the landlord already holds a contract on the unit — see our rented flat purifier guide.
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Get free quotes →Frequently asked questions
What should I check before calling an RO technician?
Check power and water first, because between them they explain most call-outs that turn out to be nothing. Confirm the socket is live by testing it with a phone charger, that the unit has not been dropped by an inverter line, that the indicator light is on, that the inlet tap is fully open, and that a normal kitchen tap actually has water at that hour. Then note whether the pump is running, whether water is going to the drain when the machine should be idle, and when the pre-filters were last changed. Those five minutes either solve it or give you something specific to describe on the phone.
My RO is completely dead. What is the most likely cause?
On a unit with no indicator light and no pump hum, the small plug-in power adaptor and the socket are far more likely than anything inside the machine. Delhi's voltage swings and frequent cuts are hard on these adaptors, and they are among the cheapest parts on the unit. Test the socket with a phone charger and check whether the purifier is on an inverter circuit that shed it during a power cut. A quote to replace an expensive component on a machine that has no power at all, before the adaptor and socket have been ruled out, is condemning the wrong part.
Can I fix a slow RO myself?
Sometimes, and it costs nothing to try. Make sure the inlet tap is fully open, check that no tube is kinked or crushed behind the unit, drain the storage tank completely and let it refill, and find out when the pre-filters were last changed. A choked pre-filter is the most common cause of slow flow in Delhi water and it mimics a failed membrane exactly, so it should always be ruled out first. Do a timed fifteen-minute fill test before and after so you can tell whether anything actually improved.
Is it worth buying a TDS meter?
For most households, yes, because it turns future conversations about the purifier from opinion into measurement. Take a reading of the water going in and the water coming out on the same day, write both down with the date, and repeat it every few months. A healthy membrane produces a large reduction between the two, and an output reading creeping up towards the input is an early warning that often arrives before the taste changes. Meters do drift over time, so treat it as a running check between proper laboratory tests rather than a replacement for one.
How we put this guide together
This guide is compiled from common Delhi NCR service patterns and reviewed by the XpertWorker team. XpertWorker connects you with independent, local professionals — we never charge you a paisa, and each professional sets their own price and quotes you free.