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| PROBLEMS | POSSIBLES CAUSES | SUGGESTED ACTION | |
| - No production of purified water | indicator PUMP switched off | - Power switch is on OFF position. | Switch ON the device | 
| - The water supply of the tap closed or insufficient pressure (in that case the light “SOURCE” is on). | Check the water supply | ||
| - water hose folded or obstructed | Check that the inlet pipe is not damaged. | ||
| - No production of purified water - Power light ON - all control light indicators OFF | On fuse is broken : - on power supply - in the controller box  | Check and replace the fuses | |
| - Not or low purified water production - indicator PUMP light ON - Pump running | Pre-treatment clogged | Replace the pre-treatment filters before the RO membrane | |
| Low flow of inlet water | Increase the flow of the inlet water | ||
| Reverse osmosis membrane clogged | Change the membrane | ||
| - Not or low purified water production - indicator PUMP light ON - Pump always OFF | Pump fuse burned | Replace the pump fuse | |
| Light indicators FULL and PUMP alternate | Defectiveness of the high-pressure sensor or check valve. | Pressure sensor and check valve | |
| Lack of pressure and low flow output | - Watertank hand valve closed. | Turn ON the watertank hand valve | |
| - volume of pure water need above the specification of the water purifier | Wait the watertank is filled again | ||
| - Lack of pressure in the pressurised watertank | Re-adjust the air-pressure of the water tank | ||
| purified water conductivity too high | Resin saturated. | Replace resin cartridge or bottle | |
| - POWER & FULL indicators ON - Pump OFF - Drain flowing continuously | - Inlet solenoid valve defective | Replace the inlet solenoid valve | |
| Conductivity meter display OFF | Batteries out of order | Replace the batteries |