Most RO faults come down to a handful of causes. Here is how to recognise them — and when to call a technician.
1. Low water flow
Usually clogged sediment or carbon filters, low inlet pressure, a weak pump or a choked membrane. Replacing filters often fixes it.
2. High TDS in purified water
A worn membrane no longer rejects salts. Compare input and output TDS; a poor ratio means the membrane needs replacement.
3. Water leakage
Check fittings, filter housings and O-rings. Switch off the water and power, and call a technician if the drip continues.
4. Tank not filling or never stops
A faulty pressure switch, solenoid valve or float, or a failing pump, can leave the tank empty or overflowing.
5. Bad taste or smell
Exhausted carbon filters or an unclean tank. Replace filters and sanitise the tank.
6. Purifier not switching on
Often a failed SMPS adapter, blown fuse or loose connector. A technician can test and replace it.
7. Constant drain-water noise
A stuck flow restrictor or solenoid keeps water running to drain and wastes water. It needs inspection.
If you are not comfortable opening your purifier, book a visit — our technicians service all major brands and quote before any work starts.
Quick answers
Can I fix RO low flow myself?
Checking that the inlet tap is fully open and that the tank pressure is normal is safe. Changing filters or opening housings is best left to a technician unless you are familiar with your model.
Why does my RO waste so much water?
Every RO sends some water to drain as reject. A blocked restrictor, a failing membrane or a stuck solenoid can make the reject far higher than normal.