Buzz
Solution:
To resolve the issue, follow the steps below:
Step 1: Purge Air from Filter Cup
First, turn off the power and shut off the water supply to the machine. Close the faucet and pressure tank valve. Then, locate the filter cores, remove the valves from cores 1, 2, 3, and fill the filter cup with water, and tighten them back.
Step 2: Restart the Filtration System
Plug in the power, turn on the water supply, faucet, and pressure tank valve to restart the machine. Monitor until there are no more air bubbles in the outlet water.
The water filter machine remains idle while wastewater continues to flow due to a faulty solenoid valve.
The solenoid valve (also known as the electromagnetic valve) is positioned behind the coarse filtration system and just before the booster pump of the water filter machine. This component is electrically connected in parallel with the pump and performs the function of closing when the machine stops running, and opening to allow water flow when the machine is operational.
After a period of use, due to various reasons, the solenoid valve may become stuck or damaged. Failure to inspect and replace it promptly can lead to water leakage through the valve even when the filter machine is turned off.
Causes:
Impurities from the water source come into contact with the solenoid valve and accumulate into deposits. Over time, this dirt layer thickens and can cause the valve to jam, preventing it from closing tightly.
The solenoid valve is past its service life, hence it no longer effectively performs the function of opening/closing according to the operating cycle of the filter machine.
To resolve this issue, you can take the following steps:
Step 1: Check the electromagnetic valve of the machine.
Disconnect the power of the water purifier.
Open the water purifier's casing and locate the electromagnetic valve. Remove the cut-off before the booster pump and see if water flows out there. If water flows, it means the electromagnetic valve is causing the water purifier to malfunction while the waste water still flows. If no water flows, then the problem is not caused by the electromagnetic valve; in that case, you need to check other parts of the water purifier.
Once you have identified that the issue is with the electromagnetic valve, you need to remove the electromagnetic valve from the water purifier. Typically, there are three common situations encountered: The valve is stuck due to excessive dirt buildup, the spring is no longer resilient, and the valve is damaged or the copper coil is burnt.
After pinpointing the issue to the electromagnetic valve, it's necessary to remove the valve from the water purifier. There are usually three common scenarios: The valve is stuck due to excessive dirt accumulation, the spring has lost its elasticity, and the valve is damaged or the copper coil is burnt out.
To replace the valve, you need to purchase a new valve with a similar model. Then, turn off the power and water supply to the machine, disconnect the wires connected to the valve, and remove the old valve. Next, place the new valve in the position of the old one and reconnect the wires.
After replacement, plug in the power and turn on the water for the filter to operate normally.
Issue 3: The filter shuts off while wastewater still flows due to a faulty check valve.
The check valve (also known as a mechanical valve) is designed to be placed just before or after the RO membrane of the filter. This component does not require electricity to operate. The main function of the check valve is to allow water to flow from the RO membrane into the pressure tank.
However, during operation, if the valve malfunctions, it may lose the ability to prevent filtered water from flowing back. As a result, the water filtered at the RO membrane does not continue to flow into the pressure tank but instead seeps back and exits at the wastewater line even when the filter is turned off.
Cause:
- The check valve gets clogged with a lot of dirt, causing it to jam, get stuck open, or not seal properly. When the power is cut off, the water in the pressure tank is not retained but leaks out. This causes a drop in pressure, causing the relay to continuously close and open, leading to water permeating back. However, since the water purifier is turned off, the solenoid valve closes, preventing water from flowing back and it will drain through the wastewater line.
- If the check valve is used for too long beyond its lifespan, it will not function properly, causing similar issues.
Solution:
When encountering a situation where the water purifier does not run but wastewater continues to flow due to a check valve malfunction, follow these steps:
Step 1: Check the check valve of the water purifier
First, disconnect the power from the water purifier and then check if the issue is with the solenoid valve as instructed above. After confirming that the solenoid valve is working properly, proceed to check the check valve.
In this particular situation, two common occurrences arise: either the valve becomes obstructed due to accumulated debris or it deteriorates from extended usage.
Step 2: Clean the one-way valve
Remove the one-way valve from the filtration system. Proceed to cleanse the valve thoroughly of any debris or residue clinging to it using running water.
Step 3: Reassess machine functionality
Following a thorough cleaning, reinstall the valve into its original position. Subsequently, observe whether there is any residual water flow along the drainage path. If not, proceed to connect the filtration system for normal operation. If there is, it is likely that the one-way valve is defective and necessitates replacement.
Step 4: Install a new valve
