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Fault display
In the event of a fault, the red fault display flashes at
the control unit. "Fault" is displayed and
The fault code is displayed with OK.
Note
If a central fault message facility is connected, this is
started.
Acknowledging a fault message
Follow the instructions on the display.
Calling up acknowledged fault messages
Extended menu:
1.
2. "Fault"
Calling up fault codes from the fault memory (fault history)
The 10 most recent faults (including those remedied)
are saved and can be called up.
Faults are sorted by date.
Note
The list can be deleted.
Fault codes
Fault code dis-
System characteristics
played
10
Regulates as if the outside
temperature were 0 °C.
18
Regulates as if the outside
temperature were 0 °C.
For an explanation of the fault code, see chapter "Fault
flashes.
codes".
For some faults, the type of fault is also displayed in
plain text.
Note
The fault message is transferred to the menu.
A fault message facility, if connected, will be switched
OFF.
If an acknowledged fault is not remedied, the fault
message will be re-displayed the following day and the
fault message facility restarted.
Service menu:
Press OK and
Fault history
Display?
Delete?
Select with
Fig. 52
Cause
Short circuit, outside tem-
perature sensor
Lead break, outside tem-
perature sensor
Troubleshooting
simultaneously for approx. 4 s.
(
Measures
Check outside temperature sensor
(see page 107)
Check outside temperature sensor
(see page 107)
91
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