English (GB)
17
13. Fault finding
Warning
Before starting work on the pump, switch off the
power supply. Make sure that the power supply
cannot be accidentally switched on.
Fault
Control panel
Cause
Remedy
1. The pump does not
run.
Light off.
a) A 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.
Display shows "- -".
a) Power supply failure. The power
supply might be too low.
Check that the power supply falls within
the specified range.
b) The pump is blocked.
Remove the impurities.
2. Noise in the system.
Shows normal operating
status.
a) Air in the system.
Vent the system. See section
11.3 Venting of heating systems
.
b) The flow is too high.
Reduce the suction head. See section
12. Pump settings and pump
performance
.
3. Noise in the pump.
Shows normal operating
status.
a) Air in the pump.
Let the pump run. It vents itself over
time. See section
.
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.
Shows normal operating
status.
a) The pump performance is too low.
Increase the suction head. See section
12. Pump settings and pump
performance
.
