35
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 described under C.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 E.3.
Fig. Z.2.1
Fuse
Z.2. Replacing the fuse
Malfunctions
Danger
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
Only use the supplied spare fuse or a fuse of the same design with the follow-
ing speci
fi
cations: T2A 250V
Performing maintenance:
- Check the date and time (see 3.1)
- Assess/check plausibility of statistics (see 2.)
- Check the error memory (see 2.6)
- Verify/check plausibility of the current measurement values (see 1.)
- Check the switch outputs/consumers in manual mode (see 4.3)
- Poss. optimise the parameter settings
Z.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 spe-
cialist and have the settings optimised if necessary.
Caution