Product Manual

English (GB)
13
4. System
overpressure.
Yes
a) 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)
+ positive inlet pressure.
Yes
b) The maximum pressure has been
exceeded - the inlet pressure is
higher than 6 bar, 0.6 MPa (87
psi)
Check the inlet conditions.
Yes
c) 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 it runs
only for a few
seconds.
Yes
a) Dry running or water shortage
Check the water source, and prime
the pump.
Yes
b) The inlet pipe is blocked by
impurities
Clean the inlet pipe.
Yes
c) The foot or non-return valve is
blocked in closed position
Clean, repair or replace the foot or
non-return valve.
Yes
d) Leakage in the inlet pipe
Repair the inlet pipe.
Yes
e) 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 it starts
repeatedly,
immediately after
stopping.
No
a) The internal non-return valve is
defective or blocked in completely
or partly open position.
Clean, repair or replace the
non-return valve.
No
b) 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