Fault Finding Chart - Grundfos SCALA2 Installation And Operating Instructions Manual

12.3 Fault finding chart

DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
Fault
1. The pump is
not running.
2. The pump is
running.
Cause
a) Power supply failure.
- -
b) The power supply is out
of prescribed voltage
Yes
range.
c) The shaft seal has
No
seized up.
d) The pump is blocked by
impurities.
No
e) Dry running.
Yes
f) The maximum runtime
No
has been exceeded.
g) The internal non-return
valve is defective or
No
blocked in completely or
partly open position.
a) Leakage from the pipe
system, or the non-return
-
valve is not properly
closed due to impurities.
b) Small continuous
consumption.
-
c) The temperature of the
- pump and water is below
3 °C.
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 10. Starting up the
product after standstill.
See section 10. Starting up the
product after 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
9. Servicing the product.
Check and repair the pipe
system, or clean, repair or
replace the non-return valve.
Check the taps and reconsider
the usage pattern (ice
machines, water evaporators
for air-conditioning, etc.).
Consider protecting the pump
and the installation against
frost.
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