9. Fault finding the product
9.1 Fault finding table
Fault: The pump does not start.
Status Cause Remedy
POWER on LED on the pump operating
panel is not lit.
The pump is not connected to the power
supply.
Make sure the power supply is switched on.
Check if external protection has tripped.
Make sure the cables and connections are
free from defects and connected securely.
The POWER on LED on the
pump operating panel is green. The Pump
Operation LED is red.
The pump is in alarm state. Contact your local Grundfos representative.
The POWER on LED on the
pump operating panel is green, but the pump
does not start.
If the Pump operation LED on the
pump operating panel is yellow, the pump has
timed out.
Wait until the yellow Pump operation LED
turns off. The pump restarts when the timed
out period is over.
Fault: The "Connect" LED is flashing blue continuously.
Status Cause Remedy
The Connect LED on the
pump operating panel is flashing blue. The
temperature sensor has been disconnected
from the pump.
The temperature sensor is out of range.
Ensure the temperature sensor is in proximity
to the pump.
The temperature sensor batteries need
replacing.
Replace the batteries in the temperature
sensor.
The temperature sensor is not working.
Replace the temperature sensor. Follow the
pairing procedure for the new temperature
sensor.
Fault: There is noise in the hydraulic system.
Status
Cause Remedy
There are no indicators lit on the pump or
accessories.
Air in the system. Open a faucet or tap to let trapped air escape.
Fault: There is noise in the circulator pump.
Status
Cause Remedy
There are no indicators lit on the pump or
accessories.
Air is trapped in the pump. Open a faucet or tap to let trapped air escape.
No liquid.
Ensure there is liquid in the hot-water supply
source.
12
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