For further information, please contact the RIVA After Sales & Service Department.
| Problem | Cause | Corrective action |
| 1. The pump runs but can’t reach the pressure as indicated | The pump sucks air |
Check the intake pipes. They must be well air-tight |
| Worn valves | Check and/or replace | |
| Worn seat of pressure relief valve | Check and clean | |
| Improper or worn nozzle | Check and/or replace | |
| Worn gaskets | Check and/or replace | |
| 2. Irregular pressure variations | Worn intake and/or pressure relief valve | Check and/or replace |
| Presence of foreign bodies in valves | Check and clean | |
| Air suction | Check intake pipes | |
| Worn gaskets | Check and/or replace | |
| Relief valve too open | Close the valve nut clockwise | |
| 3. Drop in pressure | Worn nozzle | Replace |
| Worn intake and/or pressure relief valve | Check and/or replace | |
| Presence of foreign bodies in valves | Check and clean | |
| 4. Noise | Air suction | Check the suction pipes are well air-tight |
| Broken or unloaded spring of intake and/ or pressure valves | Check and clean | |
| Presence of foreign matters | Check and clean valves | |
| Worn bearings | Replace | |
| Exceeding temperatures of pumped fluid | Decrease the temperature |