Fault Finding The Product - Grundfos ALPHA1 15-50 Bedienungsanleitung

8. 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.
High-torque start
If the shaft is blocked and you cannot start the pump, the display
indicates the alarm "E 1 - "- -"", with a delay of 20 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.
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".
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.
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) 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.
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.
Vent the system.
See section 5.4 Venting the heating
system.
Reduce the suction head.
Let the pump run. The pump vents itself
over time.
See section 5.3 Venting the pump.
Increase the inlet pressure, or make
sure that the air volume in the expansion
tank is sufficient, if installed.
Increase the suction head.
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