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4. System
overpressure.
Yes
The setpoint has been set too high.
The difference between the outlet
pressure and the inlet pressure must
not exceed 4 bar (58 psi).
Example: If the required outlet
pressure is 5 bar (73 psi), the
minimum inlet pressure must be 1 bar
(14.5 psi).
Reduce the setpoint to 4 bar (58 psi)
plus positive inlet pressure.
Yes
The maximum pressure has been
exceeded and the inlet pressure is
higher than 6 bar, 0.6 MPa (85 psi)
Check the inlet conditions.
Yes
The maximum pressure has been
exceeded. Equipment elsewhere in
the system causes a high pressure at
the pump (e.g. water heater or
defective safety equipment).
Check the installation.
5. You can reset the
pump, but the
pump runs only for
a few seconds.
Yes Dry running or water shortage.
Check the water source, and prime
the pump.
Yes
The inlet pipe is blocked by
impurities.
Clean the inlet pipe.
Yes
The foot or non-return valve is
blocked in closed position.
Clean, repair or replace the foot or
non-return valve.
Yes Leakage in the inlet pipe. Repair the inlet pipe.
Yes Air in the inlet pipe or the pump.
Prime the inlet pipe and the pump.
Check the inlet conditions of the
pump.
6. You can reset the
pump, but the
pump starts
repeatedly,
immediately after
stopping.
No
The internal non-return valve is
defective or blocked in completely or
partly open position.
Clean, repair or replace the
non-return valve.
No
The tank precharge pressure is not
correct.
Adjust the tank precharge pressure to
70 % of the required outlet pressure.
Fault
Grundfos Eye
Indicator light
Automatic reset
Cause Remedy
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