36
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 de-
fective. In that case, open the device
as described 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 con-
troller and check the function of the
switch outputs in manual mode as
described under 9.3.
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 7.5)
- 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