English (GB)
22
3. The pump
performance
is insufficient.
--
a) The pump inlet pressure
is too low.
Check the inlet conditions of the
pump.
-
b) The pump is undersized.
Replace the pump with a bigger
pump.
--
c) The inlet pipe, the inlet
strainer or the pump is
partly blocked by
impurities.
Clean the inlet pipe or the
pump.
--
d) There is a leakage in the
inlet pipe.
Repair the inlet pipe.
--
e) There is air in the inlet
pipe or the pump.
Prime the inlet pipe and the
pump.
Check the inlet conditions of the
pump.
--
f) The required outlet
pressure is too low for
the installation.
Increase the pressure setting
(arrow up).
Yes
g) The maximum
temperature has been
exceeded and the pump
is running at reduced
performance.
Check the cooling conditions.
Protect the pump against direct
sunlight or any nearby heat
sources.
4. System
overpressure.
Yes
a) The setpoint is set too
high. The difference
between the outlet
pressure and the inlet
pressure must not
exceed 3.5 bar (51 psi).
Reduce the pressure to a new
setpoint (maximum 3.5 bar (51
psi) + positive inlet pressure).
Example: If the inlet pressure is
0.5 bar (7 psi), the maximum
outlet pressure is 4 bar (58 psi).
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, for
example water heater or
defective safety
equipment.
Check the installation.
Fault
Grundfos Eye
Indicator light
Automatic reset
Cause Remedy
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