Grant Solar GS222020X - Malfunctions with Error Messages

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Led blinks + warning symbol)
Z.1. Malfunctions with error messages
Malfunctions
If the controller detects a malfunction, the red light
 ashes and the warning symbol also appears in the
display. If the error is no longer present, the warning
symbol changes to an info symbol and the red light no
longer  ashes.
To obtain more detailed information on the error, press
the key under the warning or info symbol.
Possible error messages: Notes for the specialist:
Sensor x defective Means that either the sensor, the sensor input at the controller or
the connecting cable is/was defective.
(Resistanc e table see „B.2. - Temperature resistance table for Pt1000
sensors“ on page 7)
Collector alarm Means that the collector has fallen/fell below the temperature set
under menu „5.6. - Collector alarm“ on page 25
Restart Means that the controller was restarted, for example due to a
power failure. Check the date&time!
Time & Date This message appears automatically after a mains failure
because the time&date have to be checked, and reset if
necessary.
No  ow Is displayed when ∆T between storage and collector is 50° or higher
for 5 minutes without interruption.
Frequent on / off A relay was switched on and off more than 5 times within 5 minutes.
AL failed Is displayed when AL ref-5°C was not measured for the set Al
residence time at the AL sensor.
Danger
Do not try to deal with this yourself.
Consult a specialist in the event of an error!