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FAULT FINDING

System

overpressure.

You can reset the

pump, but it runs

only for a few

seconds.

You can reset the

pump, but it starts

repeatedly,

immediately after

stopping.

5.2 Alarms and Events

If the pump does not start when the fault has been corrected, or if the fault cannot be corrected, contact

AmeriWater or Grundfos for further information.

5. There is air in the inlet pipe or the

pump.

6. The required outlet pressure is

too low for the installation.

The maximum temperature has

Yes

been exceeded and the pump is

running at reduced performance.

1. The setpoint is set too high. The

difference between the outlet

pressure and the inlet pressure must

not exceed 51 psi.

2. The maximum pressure has been

exceeded, the inlet pressure is

Yes

higher than 87 psi.

3. The maximum pressure has been

exceeded. Equipment elsewhere in

the system causes a high pressure

at the pump, for example water

heater or defective safety

equipment.

1. Dry running or water shortage.

2. The inlet pipe is blocked by

impurities.

3. The foot or non-return valve is

Yes

blocked in closed position.

4. There is a leakage in the inlet

pipe.

5. Air in the inlet pipe or the pump.

1. The internal non-return valve is

defective or blocked in completely or

partly open position.

2. The tank precharge pressure is

not correct.

SCALA2 BOOSTER PUMP

Check the cooling conditions. Protect the

pump against direct sunlight or any

nearby heat sources.

1. Reduce the pressure to a new setpoint

(maximum 51 psi + positive

inlet pressure).

2. Check the inlet conditions.

3. Check the installation.

1. Check the water source, and prime the

pump.

2. Clean the inlet pipe.

3. Clean, repair or replace the foot or

non-return valve.

4. Repair the inlet pipe.

5. Prime the inlet pipe and the pump.

Check the inlet conditions of the pump.

1. Clean, repair or replace the non-return

valve.

2. Adjust the tank precharge pressure to

70% of the required outlet pressure.

98-2039 Rev A