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ASC02-01WM
9.1.5
Symbol
SYS display and warning
sign (example)
9.2.1
9.2.2
EN2B-0365GE51 R0710
"SYS" and the warning symbol fl ash in the controller display
Mögliche Ursache
SYS means there is a system error.
This means that despite the pump
running, a temperature difference
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
• There is air in the solar circuit
Since a standard circulation pump
cannot eliminate air bubbles inside the
piping system, the heat transfer medium
circuit comes to a standstill.
9.2
Testing the temperature sensors
Safety
Only professional personnel may test the temperature sensors.
Testing the resistance values
DANGER
Risk of death by electrocution!
► Remove the controller from the power supply before opening
the case.
The temperature is recorded by resistance sensors. These are
Pt1000 temperature sensors. Depending on the temperature, the
resistance value also changes. A potentially defective sensor can
be checked using an ohmmeter.
Maintenance
Abhilfe
Have professional
personnel check the
solar energy system
to prevent damage.
Once the fault has
been remedied,
press any button to
acknowledge the
fault message.
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