The Dhw Is Too Hot; Symbols And Are Shown - Viessmann VITOPEND 100-W Operating Instructions Manual

What to do if...
There is no hot water
Cause
Symbols and
message code 0C, A0, CC, F10, F18,
F30, F38, F51, F59, F70, F78, F80, F88,
F90 or F98 is flashing.
No fuel.

The DHW is too hot

Cause
The control unit is set incorrectly.
The DHW is being heated by the solar
thermal system.
Symbols and
Cause
Maintenance reminder
Symbols and
ing.
38
(cont.)
are shown, and
are shown
are shown, is flash-
°C
Remedy
Notify your heating contractor.
Note
The type of lock-out described here can-
not be reset by the system operator.
Open the gas shut-off valve.
If necessary, check with your gas supply
utility.
Remedy
Check the DHW temperature and cor-
rect it if required (see page 28).
Notify your heating contractor.
Remedy
Notify your heating contractor to arrange
a boiler service.
You can deactivate the display for 24
hours by pressing OK.
Note
Please note that regular servicing in-
creases the service life of the product
and significantly reduces gas consump-
tion.