English (GB)
20
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 (85
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
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