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.
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 17
l
Assess/check plausibility of statistics see " Serve for function control and long-term monitoring of the system. " on
l
Check the error memory see " Error messages " on page 12
l
Verify/check plausibility of the current measurement values see " Measurement values " on page 11
l
Check the switch outputs/consumers in manual mode see " Manual " on page 13
l
Possibly optimize the parameter settings.
Possible error messages
Possible error messages
Notes for the specialist
Sensor x defective
Means that either the sensor, sensor input on the controller or the connection line is / or was
defective
(see " Temperature Resistance Table for Pt1000 Sensors " on page 9)
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.
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.
19
