Troubleshooting and Repair Tips for Reverse Osmosis Water Purifiers

I. Why is the produced pure water substandard?

1. Check the RO membrane's filtration efficiency; has it decreased or become ineffective?

2. Check if the pure water and wastewater ends of the RO membrane housing are separated or cracked.

3. Check if one end of the RO membrane's rubber ring is the correct size or damaged.

4. Check if the post-activated carbon filter is effective.

II. What causes the daily water production to fall short of requirements?

1. Check for calculation errors.

2. Check if the water pump pressure is sufficient (0.6 MPa).

3. Check if the wastewater valve or wastewater proportioner is over-conducting.

4. Check if the water temperature is too low.

III. What causes water leakage near pipe connections?

1. Check if the PE pipe end is cut flush.

2. Check if the pipe plug is properly inserted.

3. Check if the nuts are tightened.

IV. The pressure tank is full, but pure water cannot flow out.

1. The pressure tank has lost pressure. 2. Post-activated carbon filter blockage

V. What causes abnormal noise during water purifier operation?

1. Check if the check valve is malfunctioning or worn out.

2. Check if the high-pressure pump has a quality problem.

VI. What causes the machine to not work?

1. Check if there is a power outage and if the plug is securely inserted.

2. Check if the low-pressure switch wiring plug is loose or malfunctioning, preventing the power contacts from returning to their original position.

3. Check if any wiring connections at the terminals are loose.

4. Check if the tap water pressure is too low, causing the low-pressure switch to malfunction.

Solutions:

① Reconnect any loose plugs

② Replace the low-pressure switch

③ Reconnect any loose wiring connections

VII. High-Pressure Pump Doesn't Stop

1. Insufficient pressure from the high-pressure pump, unable to reach the set pressure.

2. Clogged check valve, no pure water output.

3. High-pressure pump malfunction, unable to start.

VIII. Machine Repeatedly Starts and Stops After Filling with Water

1. Insufficient raw water pressure.

2. Check valve depressurization.

3. Malfunctioning high-pressure switch or level switch.

4. System depressurization.

IX. High-Pressure Pump Works Normally, But Cannot Produce Water

1. High-pressure pump loses pressure.

2. Inlet solenoid valve malfunctions, unable to allow water inflow (no pure water or wastewater) (is it connected incorrectly?).

3. Clogged pre-filter (no pure water or wastewater, or very little wastewater).

4. Malfunctioning check valve (wastewater present, no pure water).

5. Malfunctioning automatic flushing solenoid valve, unable to close effectively (always in flushing state).

6. Malfunctioning control box, unable to close the backflush solenoid valve (always in flushing state).

7. Clogged RO membrane.

X. Insufficient Pure Water Flow

1. Clogged pre-filter. 2. Insufficient pressure from the high-pressure pump.

3. RO membrane blockage.

4. Wastewater valve or wastewater proportioner overly conductive.

5. Blockage of the post-activated carbon filter.

6. Insufficient pressure in the pressure tank or internal damage.

XI. High-pressure pump does not start, unable to produce water

1. Check for power outage and ensure the plug is inserted.

2. Check if the low-pressure switch is malfunctioning and cannot connect the power.

3. Check if the water pump and transformer are short-circuited, or if the overall wiring is incorrect.

4. Check if the high-pressure switch or water level controller is malfunctioning and cannot reset.

5. Check if the control box is faulty.

XII. High-pressure pump stops, but wastewater continues to flow

1. Solenoid valve malfunction, unable to effectively shut off the water flow.

2. Control box malfunction, unable to close the solenoid valve (referring to microcomputer type).

3. Check valve depressurization (low wastewater flow).