Viessmann VITOCAL 300 - Page 37

37
What to do if ...
Troubleshooting guide (cont.)
What to do if ... Cause Remedy
... A8 is displayed Air in the heating
system
Vent the heating system
Regulated HP
compressor 1,
circulation pump
blocked, heating system
contaminated
Notify your local
specialist
... A9, A10 or A11 is
displayed
Safety switch activated
(stage 1)
Notify your local
specialist
... A12 is displayed Type AW:
Ventilation duct clogged
Vent the heating system
Type BW:
Primary circuit leaks,
primary pump faulty
or
Type WW:
Intermediate circuit
leaks, intermediate
circuit pump faulty
Notify your local
specialist
... A13 is displayed Air in the heating
system
or
Regulated HP
compressor 2,
circulation pump
blocked, heating system
contaminated
Vent the heating
system; notify your
local specialist
... A14 or A15 is
displayed
Safety switch activated
(stage 2)
Notify your local
specialist
5592 415GB