12. Fault finding
WARNING
Electric shock
Death or serious personal injury
‐
Switch off the power supply before you start any work
on the product. Make sure that the power supply
cannot be switched on accidentally.
WARNING
Electric shock
Death or serious personal injury
‐
A damaged product must be repaired or replaced by
Grundfos or a service workshop authorized by
Grundfos.
WARNING
Hot surface
Minor or moderate personal injury
‐
The pump housing may be hot due to the pumped
liquid being scalding hot. Close the isolating valves on
both sides of the pump and wait for the pump housing
to cool down.
CAUTION
Pressurized system
Minor or moderate personal injury
‐
Before dismantling the pump, drain the system or
close the isolating valves on both sides of the pump.
The pumped liquid may be scalding hot and under
high pressure.
12.1 Fault indication on the pump operating panel
Faults preventing the pump from operating properly are indicated
on the operating panel with the warning and alarm symbol turning
either yellow or red.
A warning is indicated with yellow. The pump does not perform as
expected, and action is required in case of underheating or
discomfort.
An alarm is indicated with red and the pump stops. Action is
required.
1
2
TM082502
Warning and alarm indication on the operating panel
Pos.
Description
1
Operating panel with a warning (yellow)
2
Operating panel with an alarm (red)
Fault chart
Dry running, stop
4 flashes
Blocked pump
1 flashes
Undervoltage (pump
is running)
2 flashes
Electrical fault
3 flashes
3 flashes
Related information
9.2 Light fields indication
12.2 Dry running
12.3 Blocked pump
12.4 Undervoltage
12.6 Electrical fault
12.2 Dry running
The warning and alarm symbol flashes red four times, and the
pump stops.
Cause
Remedy
Insufficient water in the system
or the system pressure is too
low.
•
Fill the system with the correct
amount of liquid to secure the
system pressure.
Related information
12.3 Blocked pump
The warning and alarm symbol flashes red one time, and the pump
stops.
17
English (US)
