System Overpressure, And Indicator Light 5 Is On; After A Reset, The Pump Runs Briefly, And Indicator Light 4 Is On; After Resetting, The Pump Immediately Restarts, And Indicator Light 3 Is On - Grundfos SCALA2 Installation And Operating Instructions Manual

14.13 System overpressure, and indicator
light 5 is on
Grundfos Eye:
Two opposite green
indicator lights are
rotating.
Indicator light 5 is on,
indicating that the
maximum pressure has
been exceeded or the
setpoint cannot be
reached.
Cause
The setpoint is set too
high. The difference
between the outlet
pressure and the inlet
pressure must not
exceed 3.5 bar, 0.35
MPa (51 psi).
The maximum pressure
has been exceeded, the
inlet pressure is higher
than 6 bar, 0.6 MPa (87
psi).
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.
30
Remedy
• Reduce the pressure
to a new setpoint
(maximum 3.5
bar, 0.35 MPa (51 psi)
+ positive inlet
pressure).
Example: If the inlet
pressure is 0.5 bar,
0.05 MPa (7 psi), the
maximum outlet
pressure is 4 bar, 0.4
MPa (58 psi).
• Check the inlet
conditions.
• Check the installation.
14.14 After a reset, the pump runs
briefly, and indicator light 4 is on
Grundfos Eye:
Two opposite green
indicator lights are
rotating.
Indicator light 4 is on,
indicating dry running or
water shortage.
Cause
Dry running or water
shortage.
The inlet pipe is blocked
by impurities.
The foot or internal
valve is blocked in
closed position.
There is a leakage in
the inlet pipe.
Air in the inlet pipe or
the pump.
14.15 After resetting, the pump immediately
restarts, and indicator light 3 is on
Grundfos Eye:
Two opposite green
indicator lights are
rotating.
Indicator light 3 is on,
indicating leakage in the
installation after the
pump.
Cause
The internal valve is
defective or blocked in
completely or partly
open position.
The tank precharge
pressure is not correct.
Remedy
• Check the water
source, and prime the
pump.
• Clean the inlet pipe.
• Clean, repair or
replace the foot or
internal valve.
• Repair the inlet pipe.
• Prime the inlet pipe
and the pump. Check
the inlet conditions of
the pump.
Remedy
• Clean, repair or
replace the internal
valve.
• Adjust the tank
precharge pressure to
70 % of the required
outlet pressure.