Fault Finding Chart - Grundfos UPE 2000 Series Montage- Und Betriebsanleitung

8. Fault finding chart

Before removing the terminal box cover, make sure that the electricity supply has been switched off
for at least 5 minutes.
The pumped liquid may be scalding hot and under high pressure. Before any removal or dismantling
of the pump, the system must therefore be drained or the isolating valves on either side of the pump
must be closed.
Fault
The pump is not running.
None of the indicator lights
are on.
The pump is not running.
The green indicator light is
flashing.
The pump has stopped due to
a fault.
The red indicator light is on
and the green indicator light is
off.
The pump is running, but has
been stopped due to a fault.
The red and green indicator
lights are on.
The pump has been set to
stop, but has been stopped
due to a fault.
The red indicator light is on
and the green indicator light is
flashing.
Noise in the system.
The green indicator light is
on.
Noise in the pump.
The green indicator light is
on.
Insufficient heat in some
places in the heating system.
See also section 6.6 Indicator lights.
Note: The R100 can also be used for fault finding.
20
Cause
One fuse in the installation is blown.
The current-operated or voltage-oper-
ated circuit breaker has tripped out.
The pump is defective.
The pump has been stopped in one of
the following ways:
1. With the button "–".
2. With the R100.
3. External on/off switch in position
off.*
4. Via bus signal.*
* The fault can be temporarily corrected by selecting max. curve duty on the pump
or with the R100, as external forced-control signals will be ignored.
Electricity supply failure (e.g. undervolt-
age).
Missing phase (the pump runs for 2 min-
utes and then stops).
Pump blocked and/or impurities in the
pump.
Fault in electronics.
The differential pressure and tempera-
ture sensor is defective.
The pump has restarted automatically
after a temporary fault.
The differential pressure and tempera-
ture sensor is defective.
The pump has restarted automatically
after a temporary fault.
Air in the system.
The flow is too high.
The pressure is too high.
Air in the pump.
The inlet pressure is too low.
The flow is too low.
Remedy
Replace the fuse.
Cut in the circuit breaker.
Repair or replace the pump.
1. Start the pump by pressing "+".
2. Start the pump with the R100 or
by pressing "+".
3. Switch on the on/off switch.*
4. Start the pump via bus signal.*
Check that the electricity supply falls
within the specified range.
Check fuse and connections.
Remove the inspection screw and
turn the rotor by means of a screw-
driver inserted into the slot in the
shaft end, and/or dismantle and clean
the pump.
Contact GRUNDFOS.
Check sensor connection. Replace if
necessary.
Reset fault indication.
Check sensor connection. Replace if
necessary.
Reset fault indication.
Vent the system.
Reduce the head (setpoint) and pos-
sibly change over to constant pres-
sure.
Reduce the head (setpoint) and pos-
sibly change over to proportional
pressure.
Vent the pump.
Increase the inlet pressure and/or
check air volume in the expansion
tank (if installed).
Increase the head (setpoint) and/or
change over to constant pressure.