31
If the mains voltage is switched on and the con-
troller still does not function or display anything,
then the internal device fuse may be defective.
In that case, open the device as described un-
der 3.1, remove the old fuse and check it.
Exchange the defective fuse for a new one, lo-
cate the external source of the error (e.g. pump)
and exchange it. Then
fi
rst recommission the
controller and check the function of the switch
outputs in manual mode as described under
9.2.
Danger
Danger
Fig.3.1.1
Fuse
Maintenance
Z.2. Replacing the fuse
Repairs and maintenance may only be performed by a specialist. Befo-
re working on the unit, switch off the power supply and secure it against
being switched on again! Check for the absence of power!
Only use the supplied spare fuse or a fuse of the same design with the follo-
wing speci
fi
cations: T2A 250V
In the course of the general annual maintenance of your heating system you
should also have the functions of the controller checked by a specialist and
have the settings optimised if necessary.
Performing maintenance:
- Check the date and time (see 11.1)
- Assess/check plausibility of analyses (see 7.)
- Check the error memory (see 7.5)
- Verify/check plausibility of the current measurement values (see
6.)
- Check the switch outputs/consumers in manual mode (see 9.2)
- Poss. optimise the parameter settings
Caution
Maintenance
Z.3. Maintenance