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MALFUNCTIONS AND ERROR MESSAGES
If the controller detects a malfunction, the red LED blinks
and the warning symbol appears on the display.
If the malfunction resolves itself, the warning symbol
becomes an information symbol and the red LED stops
blinking.
To view details of the error, press the key under the warn-
ing or information symbol.
b
End users must not attempt to resolve malfunctions
in person. Always refer malfunctions to specialist
personnel!
Possible error messages
Sensor x error
Time & date
REPLACING THE FUSE
b
Replace the fuse with the one contained into the document envelope.
b
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!
b
Only use the supplied spare fuse or a fuse of the
same design with the following specifications: T2A
250V
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 de-
vice 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 first recommission the controller and check the
function of the switch outputs in manual mode.
MAINTENANCE
b
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.
Performing maintenance:
• Check the date and time
• Assess/check plausibility of analyses
• Check the error memory
• Verify/check plausibility of the current measurement values
• Check the switch outputs/consumers in manual mode
• Poss. optimise the parameter settings
MALFUNCTIONS
Note for service personnel
This means that there is/was a fault in the sensor, input to the controller or connecting
cable.
This message appears automatically after a power failure to indicate that the time
and date must be checked and reset if necessary.
25
(Flashing LED +
error message)
esc
Fuse
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