47
Malfunctions
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 error (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 „3.2. - Manual“ on page 21
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 fuses of the same design with the following
speci cations: T2A / 250V .
Z.2 Replacing the fuse
Z.2.1
Fuse
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