| Breakdown Type | Breakdown Reason | Counter Measures |
| Pump body generating heat | 1、Pump fault 2、 Water within pump not Water within pump not | 1、Check pump 2、 Check the dormant state of pump and adjust parameters |
| Motor generating heat; | 1、 Motor fault 2、Phase-deficient operation | 1、check motor 2、check power supply |
| Equipment operates normally while upstairs lacks water or has no water | 1、Set pressure too low 2、Water outlet pipeline blockage 3、 Water outlet pipeline leakage 4、Water outlet valve not turned on | 1、Turn up set pressure 2、Check and repair pipeline 3、Check pipeline 4、Turn on the valve |
| Frequency converter fault alarm | 1、Overcurrent, overpressure, underpressure, phase deficient 2、Parameter setting error 3、Loose connecting line, poor contact 4、False alarm of frequency converter | 1、Check environment, load and circuit 2、Check parameter setting 3、Check input/output connection 4、Change frequency converter |
| Incorrect pressure display or no display | 1、Broken pressure sensor 2、Broken analog acquisition module 3、Communication failure | 1、Change pressure sensor 2、Change analog module 3、Turn power back on and check communication parameters |
| Automatic start failure | 1、Dry-run protection 2、Overpressure protection 3、Failure of electric component in cabinet | 1、Check water inflow 2、Check whether pressure has exceeded protection value 3、Check electric component in cabinet |
| Pump not working | 1、Not powered or failure of electric control cabinet 2、Water level of steady flow compensator reduced to low water level or failure of pressure signal 3、Pump jammed by foreign matter 4、 Motor failure | 1、Measure the output of three-phase electricity and check control loop 2、Check inlet water pressure sensor or water level switch 3、Break down and repair pump 4、Check and repair motor |
| Pump turning but not pumping water | 1、Pump or outlet pipework blocked by foreign matter 2、Air accumulation within pump 3、Reversed turning of pump 4、Inlet/outlet gate not opened 5、Check valve back flow | 1、Break down and repair pump 2、Conduct venting of the pump 3、Switch the phase sequence of motor 4、Check and open inlet/outlet gate 5、Check each check value one by one and conduct disassembly, cleaning and repair |
| Slow rise of system pressure after pump starts | 1、Blockage of pump inlet/outlet pipe or value not fully opened 2、Undervoltage, falling short of rated speed 3、Long-term usage, wear and tear of sealing ring and impeller, pump performance decline, reduced flow 4、Pipeline network leakage | 1、Examine and repair pipe, check valve opening 2、Test output voltage 3、Replace pump parts 4、Examine and repair pipeline network |
| Excessive pump noise | 1、Oil starvation of motor bearings 2、Switching frequency of frequency converter too low 3、Foreign matter inside pump 4、Wear and tear or eccentricity of pump spindle | 1、Add special motor grease 2、Increase the switching frequency of frequency converter 3、Break down pump body to get rid of foreign matter 4、Replace parts within pump or adjust pivot |
