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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..
Possible error messages
Possible error messages Notes for the specialist
Sensor x defective Means that either the sensor, sensor entrance on the controller or the connecting wire was
defective (see " Temperature Resistance Table for Pt1000 Sensors " on page 9).
Collector alarm Means that the temperature on the collector set under “Collector protection" was exceeded.
Restart Means that the controller was restarted, for example, due to a power outage. Check date &
time!
Time & Date This display appears automatically after a longer network disruption, because the time & date
must be examined and, if applicable, adjusted.
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:
lCheck the date and time see " Time & Date " on page 19
lAssess/check plausibility of statistics see " Serve for function control and long-term monitoring of the system. " on
page 12
lCheck the error memory see " Error messages " on page 12
lVerify/check plausibility of the current measurement values see " Measurement values " on page 11
lCheck the switch outputs/consumers in manual mode see " Manual " on page 13
lPossibly optimize the parameter settings.
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