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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, remove
the old fuse and check it.
Exchange the defective fuse for a new
one, locate the external source of the er-
ror (e.g. pump) and exchange it.
Then rst recommission the controller and
check the function of the switch outputs in
manual mode as described under 4.2.
Fuse
Malfunctions
Danger
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!
Only use the supplied spare fuse or a fuse of the same design with the
following speci cations: T2A 250V
Z.2 Replacing the fuse
Z.2.1
Z.3 Maintenance
Caution
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.
Performing maintenance:
- Check the date and time (see 7.2)
- Assess/check plausibility of analyses (see 2.4)
- Check the error memory (see 2.5)
- Verify/check plausibility of the current measurement values (see 1.)
- Check the switch outputs/consumers in manual mode (see 4.2)
- Poss. optimise the parameter settings
54


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