10. Service
WARNING
Electric shock
Death or serious personal injury
‐ All electrical connections must be carried out by a
qualified electrician in accordance with local
regulations.
‐ Switch off the power supply before you start any work
on the product. Make sure that the power supply
cannot be switched on accidentally.
‐ A damaged product must be repaired or replaced by
Grundfos or a service workshop authorized by
Grundfos.
‐ Connect the pump to earth.
WARNING
Pressurised system
Minor or moderate personal injury
‐ Before disassembling the pump, drain the
system or close the isolating valves on both sides of
the pump. Slowly loosen the screws and unpressurize
the system. The pumped liquid may be scalding hot
and under high pressure.
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.
Wear safety shoes.
Wear protective gloves.
Wear safety glasses.
10.1 Dismantling the product
Follow the steps below to dismantle the product:
1. Switch off the power supply.
2. Close the inlet and outlet valves.
3. Pull out the power plug.
4. Loosen the unions.
5. Remove the pump from the system.
11. 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.
‐ 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
Pressurised system
Minor or moderate personal injury
‐ Before disassembling 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.
11.1 Alarm and warning code logs
Grundfos GO saves up to 20 alarms and warnings in total in the
Alarms and warnings menu.
11.2 Faults indicated on the pump
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 when the warning and alarm symbol is
turning yellow. The pump is still running, but it does not perform
as expected, and action is required in case of insufficient heating or
discomfort. The operating panel alternates between showing either
the error code or the control mode and setpoint.
An alarm is indicated when the warning and alarm symbol is turning
red and the pump stops. In case of an alarm, all modes, speed and
unit LEDs are switched off. Action is required.
It is still possible to connect to the pump in order to get a detailed
error description from Grundfos GO.
If an alarm or warning is present, an error code will be displayed in
the unit LED display.
LED
Description
Warning indication
Alarm indication
20
English (GB)
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