Viessmann Vitocal 350-A Installation And Service Instructions Manual page 133

Control unit diagnostics
Message overview
All messages are identified by a two-digit code.
Message
System characteristics Cause
01 System fault
02 Std after data err
03 Configuration fault
«05 Fault EEV
¸07 Message EEV
«10 Outside temp. sensor
Operation with outside
temperature -40 °C
«18 Outside temp. sensor
Operation with outside
temperature -40 °C
(cont.)
Control unit processor
faulty
Delivered condition set
after recognition of data
fault
Incorrect configuration of
system components
■ Heat pump cascades
enabled via external
extension H1 or LON
without components
being installed ("Cas-
cade control").
Fault message from EEV
controller (refrigerant cir-
cuit control)
Message from EEV con-
troller (refrigerant circuit
control)
Short circuit, outside
temperature sensor
Lead break, outside tem-
perature sensor
Troubleshooting
Measures
Replace programming
unit
Reconfigure system.
Check and match associ-
ated parameters, reset to
delivered condition if
required ("Reset", see
operating instructions),
and reconfigure system.
Contact your local heating
contractor if the cause of
the fault cannot be rem-
edied.
Observe messages in
heat pump module diag-
nosis (see page 151).
Observe messages in
heat pump module diag-
nosis (see page 151).
Check resistance (Ni 500)
at connections 3X1.16
and 3X2.16; replace sen-
sor if required.
Check resistance (Ni 500)
at connections 3X1.16
and 3X2.16; replace sen-
sor if required.
133