31
16.2 Replacing the fuse
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.
In that case, open the device as de-
scribed under 3.1, remove the old fuse
and check it.
Exchange the defective fuse for a new
one, locate 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 10.2.
Malfunctions
16
16
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 for the absence of power!
Danger
Danger
Only use the supplied spare fuse or a fuse of the same design with
the following speci
fi
cations: T2A 250V
Fig.3.1.1
Fuse
16.3. Maintenance
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.
Caution
Performing maintenance:
- Check the date and time (see 8.1)
- Assess/check plausibility of statistics (see 7.)
- Check the error memory (see 7.4)
- Verify/check plausibility of the current measurement values (see 6.)
- Check the switch outputs/consumers in manual mode (see 9.3)
- Poss. optimise the parameter settings