Viessmann PLC VITOCAL 350-HT PRO, Operating Instructions For The System User

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The appliance contains fluorinated hydrocarbons
(refrigerant) included in the Kyoto Protocol.
The type plate indicates the type of refrigerant used in
the heat pumps.
The global warming potential (GWP) of the refrigerant
is expressed as a multiple of the GWP of carbon diox-
ide (CO
2
). The GWP of CO
2
is 1.
Refrigerant Global warming poten-
tial (GWP)
HFO-1234ze 1
Overview of fault messages
Priority 1 faults (system switches off)
Note
The following faults may cause consequential dam-
age .
All faults that are marked with an additional "!" should
be reported to Viessmann Service before they are
acknowledged.
Do not acknowledge faults more than once.
If a fault remains active or occurs more than once,
please contact your heating contractor or Viessmann
Service.
ID Fault message Effects Possible cause
1! "EEV control" The system switches off Defective electronic expansion valve
control. Evaporator superheating was
below 2 K for an extended period of time
2 "Sensor fault, outlet, con-
denser" The system switches off Faulty temperature sensor at condenser
outlet
3 "Sensor fault, casing" The system switches off Casing temperature sensor faulty
4 "Sens.fault,high press." The system switches off High pressure sensor faulty
5 "Ext. set val, temp maint." The system switches off External set value from higher ranking
system is outside the range
6 "Sensor fault low press." The system switches off Low pressure sensor faulty
7 "Sens. fault, suctn gas t 1" The system switches off Suction gas temperature sensor down-
stream of evaporator is faulty
8 "Sens. fault, suctn gas t 2" The system switches off Suction gas temperature sensor down-
stream of IHE is faulty
9 "PLC CPU" The system switches off SPS (PLC) internal fault
10 "Casing temp too high" The system switches off The casing temperature has exceeded
the alarm value
11 "Condensation temp too
high" The system switches off The condensation temperature has ex-
ceeded the alarm value
12 "Evaporation temp too low" The system switches off The evaporation temperature has excee-
ded the alarm value
13 "Em. stop act." The system switches off The emergency stop button has been
operated
14 "High pressure shutdown" The system switches off The high pressure application limit has
been exceeded
15 "Low pressure shutdown" The system switches off The low pressure application limit has
been undershot
16 "Primary flow rate too low" The system switches off The primary flow rate (heat source) is too
low
Appendix
Refrigerant
5801 531 GB