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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 supply
and secure it against being switched on again! Check that there is no power flowing!
Only use the included safeguard or a similar safeguard with the following
specifications: T2A / 250 V.
If the mains voltage is switched on and the controller still does not function or display
anything, then the internal device fuse may be defective. First find the external fault
source (e.g. pump), replace it and then check the device fuse.
To replace the device fuse, open the device as described under "See " Wall Install-
ation " on page 10", remove the old fuse, check it and replace if necessary.
Then first recommission the controller and check the function of the switch outputs in
manual mode as described.
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 22
lAssess/check plausibility of statistics See " Statistics " on page 14
lCheck the error memory See " Notifications " on page 14
lVerify/check plausibility of the current measurement values See " Measurement values " on page 13
lCheck the switch outputs/consumers in manual mode See " Manual " on page 15
lPossible optimization of the parameters setting (only on customers request)
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 defect-
ive (See " Temperature Resistance Table for Pt1000 Sensors " on page 11).
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.
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