Cause A tap has not been entirely closed after use.
Remedy Make sure all taps are closed.
Cause There is a minor leakage in the system.
Remedy Make sure there are no leakages in the system.
8.4.3 The "Alarm" indicator light is permanently on
Cause Dry running. The pump needs water.
The pump has stopped due to the dry-running
function.
Remedy Make sure that the water supply is sufficient.
Cause The power supply to the pump is disconnected.
Remedy Check the plug and cable connections, and make
sure that the built-in circuit breaker of the pump is
switched off.
Cause The motor protection of the pump has tripped
due to overload.
Remedy Make sure the motor or pump is not blocked.
Cause The pressure manager is defective.
Remedy Repair or replace the pressure manager.
Find more information in the service instructions
at https://product-selection.grundfos.com.
8.4.4 The "Power on" indicator light is off even though the
power supply has been switched on
Cause
The fuses in the electrical installation have
blown.
Remedy Replace the fuses. If the new fuses also blow,
check the electrical installation for malfunctions.
Cause The earth-leakage circuit breaker or the voltage-
operated circuit breaker has tripped.
Remedy Cut in the circuit breaker.
Cause The pressure manager is defective.
Remedy Repair or replace the pressure manager.
Find more information in the service instructions
at https://product-selection.grundfos.com.
8.4.5 The "Pump on" indicator light is on, but the pump does
not start
Cause
The power supply to the pump is disconnected.
Remedy Check the plug and cable connections, and make
sure that the built-in circuit breaker of the pump is
switched off.
Cause The motor protection of the pump has tripped
due to overload.
Remedy Make sure the motor or pump is not blocked.
Cause The pump is defective.
Remedy Repair or replace the pump.
Cause The pressure manager is defective.
Remedy Repair or replace the pressure manager.
Find more information in the service instructions
at https://product-selection.grundfos.com
8.4.6 The pump does not start when water is consumed
The "Pump on" indicator light is off.
Cause There is too big a difference in height between
the pressure manager and the tapping point.
Remedy Adjust the installation, or increase the start
pressure.
Cause The pressure manager is defective.
Remedy Repair or replace the pressure manager.
Find more information in the service instructions
at https://product-selection.grundfos.com.
8.4.7 The pump does not stop
Cause The pump cannot deliver the necessary outlet
pressure.
Remedy Replace the pump.
Cause The start pressure is set too high.
Remedy • PM 1: The start pressure is factory set. Make
sure that your product is dimensioned correctly.
• PM 2, PM TWIN: Decrease the start pressure.
Cause The non-return valve is stuck in open position.
Remedy Clean or replace the non-return valve.
Cause The pressure manager is defective.
Remedy Repair or replace the pressure manager.
Find more information in the service instructions
at https://product-selection.grundfos.com.
8.5 Fault finding boosters with a pressure tank
8.5.1 The booster starts and stops too frequently
Cause
Incorrect precharge pressure.
Remedy Adjust the diaphragm tank pressure.
Cause Leakage in pipes.
Remedy Check and repair the pipes.
Cause The diaphragm is broken. Water escapes if the
air valve is pushed down.
Remedy Replace the pressure tank.
16
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