Malfunctions/Maintenance
Replacing the Fuse
Repairs and maintenance may only be performed by a specialist. Before working on the unit, switch off the power sup-
ply and secure it against being switched on again! Check that there is no power flowing!
Only use the supplied spare fuse or a fuse of the same design with the following specifications: 2 AT/250 VSOREL Art.
No.: 2125
If the mains voltage is switched on and the controller still does not function or dis-
play anything, then the internal device fuse may be defective. In that case, open
the device as described in section C, remove the old fuse and check it.
Exchange the defective fuse for a new one, locate the external source of the error
(e.g. the pump) and exchange it. Then first recommission the controller and check
the function of the switch outputs in manual mode as described in Section 3.2..
Maintenance
In the course of the general annual maintenance of your heating system, the functions of the controller should also
checked by a specialist and the settings should be optimized if necessary.
Performing maintenance:
l Check the date and time see " Time & Date " on page 28
l Assess/check plausibility of statistics see " Serve for function control and long-term monitoring of the system. " on
page 15
l Check the error memory see " Error messages " on page 15
l Verify/check plausibility of the current measurement values see " Measurement values " on page 14
l Check the switch outputs/consumers in manual mode see " Manual " on page 16
l Possibly optimize the parameter settings.
Possible error messages
Possible error messages Notes for the specialist
No flow If ΔT between store and collector is 50 ° C or more for 5 minutes, this message is displayed.
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.
System protection The collector temperature has exceeded the set temperature and the solar pump has been
turned off, so that the system does not overheat.
Collector protection The collector temperature has exceeded the set temperature and the solar pump has been
turned on, in order to cool the collector via the memory.
Recooling The exceeding energy is/was transmitted via the collector to protect the system.
Frost Protection The solar pump is switched on in order to protect the collector from freezing.
Low system pressure It is displayed when Pmax pressure monitoring is active and Pmax is exceeded.
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