When The Hot Water Is Too Hot; Scanning Fault Display - Viessmann VITODENS Operating Instructions Manual

When the hot water is too hot

Cause
Control unit incorrectly adjusted
Sensor fault

Scanning fault display

If your heating system has developed a fault, it will be displayed and indicated
by the flashing red fault indicator (see page 9).
You can check the fault code on the display and then notify your heating con-
tractor accordingly. This allows the heating contractor to better prepare for the
service call and may save additional travelling costs.
Checking/acknowledging fault codes
Press the following keys:
1. a/b to display further fault
codes, if several faults are
active.
Remedy
Check and, if necessary, correct DHW
temperature (see page 15)
Notify your local heating contractor
2. d
to acknowledge the fault.
Note
If the fault has not been rectified, the
fault message will be redisplayed at
7:00 h on the following day. The red
fault display flashes until the fault has
been rectified.
What to do
21