Viessmann VITOTRONIC 200 Service Instructions Manual page 67

Messages
(cont.)
Message
Code/system characteris-
tics
DE Prot.primry pump/fan2
Compressor stops.
E0 LON subscriber
No communication with
the subscriber via LON.
E1 External heat source
Heat pump control unit
cannot start external heat
source.
E2 Lag heat pump
Heat pump control unit
cannot start lag heat
pump.
F2 Parametrs 5030/5130
Energy statement (see
page 91) will not be cal-
culated correctly.
Cause
Primary circuit fault:
■ Primary circuit pres-
sure switch/frost stat
has responded.
■ Primary pump thermal
relay, heat pump
2nd stage (if installed).
■ Three phase monitor
has detected a fault or
is faulty.
LON subscriber has
failed or connection
faulty.
Fault, external heat
source.
Fault at a lag heat pump
in the cascade.
Compressor output not
selected.
Troubleshooting
Measures
■ Check safety equip-
ment (frost protection,
brine pressure, frost
protection AC-Box) on
cross connect PCB, ter-
minals X3.9 and X3.8
(see page 165); in sys-
tems without safety
equipment, check
jumper between X3.9/
X3.8.
■ Reset thermal relay,
check primary pump
and replace if required.
Switching signal can be
tested at terminal 214.1
(see page 150).
■ Call up fault memory at
faulty subscriber.
■ Check system and sub-
scriber numbers (see
page 16); check con-
nections and LON con-
necting cables.
Check external heat
source.
Check heat pump control
unit display at lag heat
pump.
Set "Output compressor
stage 5030/5130" param-
eter accordingly.
67