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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 supplied spare fuse or a fuse of the same design with the following specifications: 2 AT/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 Installation " on page
25", 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 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:
lCheck the date and time See " Time & Date " on page 42
lAssess/check plausibility of statistics See " Statistics " on page 29
lCheck the error memory See " Message Log " on page 29
lVerify/check plausibility of the current measurement values See " Measurement values " on page 28
lCheck the switch outputs/consumers in manual mode See " Manual " on page 30
lPossible optimization of the parameters setting (only on customers request)
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 Anti-legionella failed appears if at least anti-legionella Tsoll -5 °C could not be held at the anti-legion-
ella sensor for the set exposure time.
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 storage.
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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