42
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 controller and
check the function of the switch out-
puts in manual mode as described
under 9.2.
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 Danger 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 12.2)
- Assess/check plausibility of analyses (see 7.4)
- 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
