Fault Finding Chart; P Syst.max - Grundfos SCALA 2 Service Instruction

7.3 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.
3. Pump performance
is insufficient.
Cause
- - Power supply failure.
The power supply is out of the
Yes
prescribed voltage range.
No The shaft seal has seized up.
No The pump is blocked by impurities.
Yes Dry running.
The maximum runtime has been
No
exceeded.
The internal non-return valve is
No defective or blocked in completely or
partly open position.
Leakage from the pipes, or the
- non-return valve is not properly
closed due to impurities.
- Small continuous consumption.
The temperature is below the freezing
-
point.
- - The pump inlet pressure is too low.
- The pump is undersized.
The inlet pipe, the inlet strainer or the
- -
pump is partly blocked by impurities.
- - Leakage in the inlet pipe.
- - Air in the inlet pipe or the pump.
The required outlet pressure is too
- -
low for the installation.
The maximum temperature has been
Yes exceeded and the pump is running at
reduced performance.
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.
Remove the end cover plug and
deblock the shaft seal by turning the
shaft by means of a screwdriver.
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.
Check and repair the pipes, 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.
Check the inlet conditions of the
pump.
Replace the pump with a bigger
pump.
Clean the inlet pipe or the pump.
Repair the inlet pipe.
Prime the inlet pipe and the pump.
Check the inlet conditions of the
pump.
Increase the pressure setting (arrow
up).
Check the cooling conditions. Protect
the pump against direct sunlight or
any nearby heat sources.
11