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| PROBLEMS | POSSIBLES CAUSES | SUGGESTED ACTION | 
| Power light OFF | No power supply | Verify the power supply wires ; switch power ON | 
| On power supply fuse is broken | Check and replace the fuse | |
| - Power light ON - No production of purified water - indicator PUMP is off - indicator SOURCE is ON | The inlet tap water supply is closed or has insufficient pressure | Improve water supply | 
| Water inlet tubing folded or obstructed | Check that the inlet pipe is not damaged. | |
| - Power light ON - No production of purified water - Power light ON - all control light indicators OFF | A fuse is broken : - pump fuse - fuse in the controller box  | Check and replace the fuse | 
| - Power light ON - No or low purified water production - indicator PUMP light ON - Pump running | Pre-treatment clogged | Replace the pre-treatment filters before the RO membrane | 
| Weak flow of inlet water | Increase the flow of the inlet water | |
| Reverse osmosis membrane clogged | Change the membrane | |
| - Power light ON - No 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 | Defective high-pressure sensor or check valve | Change pressure sensor and check valve | 
| - Power light OFF - Lack of pressure and low flow output | Watertank hand valve closed | Turn ON the watertank hand valve | 
| Requested pure water volume above the capacity of the water purifier | Wait the watertank is filled again | 
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| 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 light ON - FULL indicator 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 |