How to Fix RO Water Purifier That is Not Working in 2022

If you are facing trouble with your RO water purifier, then we can help you with a fix. We keep on getting common questions such as ‘why my Aquaguard water purifier is not working? or ‘why my Kent RO is not working’. So we have shared our experience to help you in troubleshooting your RO water purifier.

There are many reasons due to which an RO purifier can stop working. Good news is, that most of the times it can be solved without the help of a professional. Let’s see what are common reasons why your RO could have stopped working and what is the fix.

Here are most common reasons why ROs stop working and how to troubleshoot.

1. No Power

Lack of power supply is number one reason for RO not working.

What you can do?

  • Check if ‘power on’ indicator lights up on switching on the power on button on the switch board.
  • Check if the power plug is inserted properly.
  • Check if power coming from the switch board with the help of a tester. If there is no voltage then it can be a case of loose connection in the board itself.

2. Closed Diverter Valve / Ball Valve

The pipe that connects the RO water output to the tap comes with a ball valve. Sometimes it is in the closed position, cutting off the water supply to the tap.

What you can do?

Try changing the direction of the valve if you are not sure if it is open or closed.

3. No Input Water Supply

RO will not supply output water if there is no input water. This is another common reason why RO purifiers stop working.

What you can do?

Check your house water tank if it has enough water and check if other taps connections are receiving water.

4. SMPS Malfunction

Some-times the SMPS (also called adapter) can get damaged due to high voltage fluctuation. This is one of the most common reasons for RO water purifier not working is SMPS malfunction.

What you can do?

Call the service technician of the brand.

How to check if the SMPS is working or not yourself?

SMPS is responsible for converting the power supply from AC to DC. Once this conversion takes place, it supplies this DC power to the water pump.

Checking the SMPS is easy for a technician. However, if you want to check it yourself, then here are the steps to follow.

Note: This process does not work with all the water purifier brands.

Step 1

Disassemble the filter units. You can do this by first taking out the pipes attached to these filter units. You can take the pipes out easily by pushing back the small valve attached to the filter units. Now, you can easily remove all the filter units one by one.

Step 2

Now untie all the wirings, but make sure to remember the wiring, because you will have to connect the wiring later on.

Step 3

Now insert the plug into the switch board and switch it on and off once.

Step 4

Now connect the two wires coming out of the adapter to see if you get any sparking then it means that the adapter is working, and if nothing happens, then it will mean that your adapter has malfunctioned.

5. Float Valve Malfunction

Another common reason is malfunctioning of float valve (microswitch). Float valve prevents water tank from overflowing by switching off the water purifier as soon as the tank gets full. If this float valve malfunctions, it can shut-off the water purifier permanently.

What you can do?

You can replace the float switch or take the support of the service technician to get this problem resolved.

Related: How Water Purifier Works

6. Faulty PCB

The PCB (printed circuit board) is made of small capacitors and transformers that make it prone to damage especially during voltage fluctuations. Hence, if the power supply is not coming or the LED lights are not on then PCB might have got damaged.

What you can do?

You can check the PCB and get it replaced.

7. Pressure Pump Malfunction

RO water purifiers come with an pressure pump for pressurizing water to pass through the RO filter. If the pump stops working, water cannot pass through the different chambers. So if the power button is on but the purifier is not working then it can be a case of pressure pump damage.

What you can do?

Pressure pumps are usually non-repairable and you’ll need to install a new one. Call the service technician for assistance.

8. Shorting of Low-Pressure Switch

Low pressure switch is responsible for cutting off water supply to the purifier during low water pressure. When this switch malfunctions, the purifier stops working completely.

What you can do?

Service technician can replace the switch within no time. And Make sure to keep the water pressure  constant.

9. Shorting of the solenoid valve

Just like other valves, this valve also stops the water purifier when some conditions are met. It stops the RO wastewater from flowing as soon as you switch off the RO machine. In case of solenoid valve malfunctioning, it shuts off the entire purifier.

What you can do?

Service technician can help you in resolving this issue.

10. Air Vacuum Inside the RO

Sometimes air gets trapped inside the water purifier because of loose pipe. Also, if the pre-filter is clogged, it blocks the water supply, creating air vacuum inside.

This air vacuum stops water from flowing inside the RO and hence the RO purifier stops working.

What you can do?

Contact the service technician.


Most of the times you can troubleshoot the problems yourself but not all the issues can be resolved by you. In such cases, you can always take the help of technician. Also, Some of the best water purifiers come with decent warranty terms. So, if your water purifier is still under warranty, then you should avail this warranty for speedy and free servicing.

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