41
738.955 | 10.40
EN
NOTE
The pump does not stop running in the case of an
interruption in the Grundfos Direct Sensors
TM
VFS 1-12
T or Q.
"SYS" and the warning sign flash in the controller
display.
Possible cause / remedy
SYS means there is a system error. This means that
despite the pump running, a temperature differ-
ence exceeding 80 K between the collector and the
storage tank was recorded.
The following causes are possible:
The pump is faulty or not correctly connected
The isolating valve in the solar circuit is closed
Air is in the solar circuit.
•
•
•
Since a standard circulation pump cannot elimi-
nate air bubbles inside the piping system, the heat
transfer medium circuit comes to a standstill.
Have professional personnel check the solar
energy system to prevent damage.
Once the fault has been remedied, press any but-
ton to acknowledge the fault message.
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