Fault Finding The Product; High-Torque Start; Fault Finding Table - Grundfos ALPHA2 Series Installation And Operating Instructions Manual

9. Fault finding the product

DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before starting any
work on the product. Make sure that the power
supply cannot be accidentally switched on.
CAUTION
Pressurised system
Minor or moderate personal injury
- Before dismantling the pump, drain the system or
close the isolating valves on either side of the
pump. The pumped liquid may be scalding hot
and under high pressure.
WARNING
Electric shock
Death or serious personal injury
- A damaged product must be repaired by Grundfos
or a service workshop authorised by Grundfos.

9.2 Fault finding table

Fault Operating panel
1. The pump does not Light off.
run.
Changes between "- -"
and "E 1".
Changes between "- -"
and "E 2".
Changes between "- -"
and "E 3".
Changes between "- -"
and "E 4".
2. Noise in the system. No warning is indicated
on the display.
3. Noise in the pump. No warning is indicated
on the display.
4. Insufficient heat. No warning is indicated
on the display.
18

9.1 High-torque start

If the shaft is blocked and you cannot start the pump, the display
indicates the alarm "E1 - "- -"", with a delay of 30 minutes.
The pump attempts to restart until the pump is powered off.
During the start attempts, the pump vibrates due to the
high-torque load.
High-torque start is available as from ALPHA2 model D.
Cause
a) A fuse in the installation is blown.
b) The current-operated or
voltage-operated circuit breaker has
tripped.
c) The pump is defective.
a) The rotor is blocked.
a) Insufficient supply voltage.
a) Electrical fault.
a) Dry-running protection.
a) Air in the system.
b) The flow rate is too high.
a) Air in the pump.
b) The inlet pressure is too low.
a) The pump performance is too low.
WARNING
Hot surface
Minor or moderate personal injury
- The pump housing may be hot due to the pumped
liquid being scalding hot. Close the isolating valves
on both sides of the pump and wait for the pump
housing to cool down.
Remedy
Replace the fuse.
Cut in the circuit breaker.
Replace the pump.
Remove the impurities.
Make sure that the supply voltage falls
within the specified range.
Replace the pump.
Make sure that there is sufficient liquid in
the pipe system. Reset the warning by
pressing any button or switch off the
power supply.
Vent the system.
See section 4.3 Venting the
Reduce the suction head.
Let the pump run. The pump vents itself
over time.
Increase the inlet pressure, or make
sure that the air volume in the expansion
tank is sufficient, if installed.
Change the pump setting to increase the
pump performance. See section
6.6.1 Changing from recommended to
alternative pump setting.
pump.