Error messages:
devireg
™
540/550 has a built-in system that constantly
checks the heating system, the thermostat itself and a pos-
sible network for any malfunctions.
If an error occurs, the display will fl ash together with a
reading of the detected fault, which will be shown indicated
by the weekday numbers 1 to 7:
No:
7
4
3
Fault:
Clock is not adjusted
The thermostat is
switched off because of
overheating
Confi gured as a Slave,
but cannot fi nd any
Master unit
What to do:
Set the clock
Let the thermostat cool for
a period.
Then enter basic setup to
leave fault mode
One unit must be confi g-
ured as Master
26
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