Grundfos alpha2l User Manual

22
11. Fault finding chart
Warning
Before starting any work on the pump, make sure that the electricity
supply has been switched off and that it cannot be accidentally
switched on.
Fault
Control
panel
Cause Remedy
1. The pump
does not run.
Light off. a) One fuse in the
installation is blown.
Replace the fuse.
b) The current-operated or
voltage-operated circuit
breaker has tripped out.
Cut in the circuit breaker.
c) The pump is defective. Replace the pump.
"POWER
ON" is on
only.
a) Electricity supply failure.
Might be too low.
Check that the electricity supply
falls within the specified range.
b) The pump is blocked. Remove the impurities.
2. Noise in the
system.
"POWER
ON" and the
light field for
pump setting
are on.
a) Air in the system. Vent the system.
See 9.3 Venting of heating
systems.
b) The flow is too high. Reduce the suction head.
See 10. Pump settings and
pump performance.
3. Noise in the
pump.
"POWER
ON" and the
light field for
pump setting
are on.
a) Air in the pump. Let the pump run. It vents itself
over time.
See 9.2 Venting the pump.
b) The inlet pressure is too
low.
Increase the inlet pressure or
check the air volume in the
expansion tank, if installed.
4. Insufficient
heat.
"POWER
ON" and the
light field for
pump setting
are on.
a) The pump performance
is too low.
Increase the suction head.
See 10. Pump settings and
pump performance.

Grundfos alpha2l Specifications

General

Voltage	230 V
Protection Class	IP42
Maximum Operating Pressure	10 bar
Enclosure Class	IP42
Insulation Class	F
Pump Housing	Cast iron
Type	Circulator pump
Frequency	50 Hz
Approvals	CE
Connection	G 1"
Ambient Temperature	Up to 40°C