For further information, please contact the RIVA Service Department.
| Problem | Cause | Corrective action |
| 1. High crankcase temperature | Overheating |
Check coolant charge |
| Poor circulation of treated water (winter cycle) or condensation water (summer cycle) | Correct circulation | |
| 2. Low suction pressure | Low coolant charge | Add |
| Poor circulation of condensation water (winter cycle) or treated water (summer cycle) | Correct circulation | |
| 3. System noisy | Loose fastening bolts | Tighten bolts |
| Unit base improperly insulated | Insulate foundation | |
| Improper support or insulation of piping | Use correct piping techniques and support piping with suitable hangers | |
| Piping vibrations | Clip pipes correctly. Check the couplings | |
| 4. Compressor does not start | Power off | Check the supply. Check fuses and/or magneto-thermal switches |
| Thermostat misadjusted | Adjust thermostat | |
| Pressure switch open | Reset switch and check proper calibration, 20 bar (h.p.) and 2.5 bar (I.p.) | |
| Faulty wiring | Check diagram and rewire | |
| Pumps not operating | Check pumps free rotation. | |
| Check the magneto-thermal switches | ||
| Flow-switch does not close | Restore correct treated water circulation | |
| Gas discharging unit | Check coolant circuit for possible breaks due to transport and installation | |
| 5. Compressor cycles intermittently | Low pressure switch erratic in operation | Check pressure switch setting. Check good circulation of condensed water |
| Low coolant charge | Add | |
| Internal protection tripped | Check for any voltage drop, correct | |
| 6. High delivery pressure with compressor stop (high pressure switch). | Coolant overcharge | Remove excess coolant |
| Insufficient or no condenser water flow; clogged condenser or sea-water strainer | Adjust water regulating valve to condenser; clean condenser or sea-water strainer | |
| Condensed water pump off | Check pump and start | |
| Poor treated water circulation (winter cycle) | Check for air in the circuit | |
| Check for possible clogging | ||
| Air in coolant circuit | Restore vacuum and refill with coolant |