Fault Finding Chart - Grundfos SCALA Installation And Operating Instructions Manual

12.3 Fault finding chart

Warning
Before starting fault finding, switch off the
power supply.
Make sure that the power supply cannot
be accidentally switched on.
Fault
1. The pump is
not running.
18
Cause
a) Power supply failure
- -
b) The power supply is out
of prescribed voltage
range
Yes
c) The shaft seal has seized
No up
d) The pump is blocked by
impurities
No
e) Dry running
Yes
f) The maximum runtime
has been exceeded
No
g) The internal non-return
valve is defective or
No blocked in completely or
partly open position
Remedy
Switch on the power
supply.
Check the cables and
cable connections for
defects and loose
connections and check
for blown fuses in the
electrical installation.
Check the power supply
and the pump
nameplate. Reestablish
the power supply within
the prescribed voltage
range.
See section 9. Starting
up the product after
shutdown or standstill.
See section 9. Starting
up the product after
shutdown or standstill.
Contact Grundfos
Service if the problem
persists.
Check the water source,
and prime the pump.
Check the installation for
leakage and reset the
alarm.
Clean, repair or replace
the non-return valve.
See section
10. Servicing the
product.