Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 149

Messages
(cont.)
Message
System characteristics Cause
DE Primary source 2
E0 LON subscriber
E1 Ext. heat generation
E2 Fault lag heat pump
F2 Param. output 1/2
FF New start
Primary circuit fault:
■ Primary circuit pres-
sure switch/frost pro-
tection monitoring has
responded
■ Primary pump thermal
circuit breaker, heat
pump stage 2
(type BWS)
■ Three phase monitor
has detected a fault or
is faulty
LON subscriber has
failed or connection is
faulty
Fault - external heat
source
Fault at a lag heat pump
in the cascade
Compressor output not
selected
Control unit restart
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; in
systems without safety
equipment, check
jumper between X3.9/
X3.8.
■ Reset thermal relay,
check primary pump
and replace if required
The switching signal can
be tested at connection
214.1.
■ Call up fault memory at
faulty subscriber.
■ Check address (system
and subscriber num-
bers); check connec-
tions and LON connect-
ing cables.
Check external heat
source.
Check heat pump control
unit display at lag heat
pump.
Set "Output compressor
stage 5030/5130" param-
eter accordingly.
No measures required.
149