Viessmann GC1 Installation And Service Instructions

116
Troubleshooting
Faults which are displayed at the programming unit (cont.)
Fault
code
System
characteristics
Cause Remedy
aa
Control mode ThermControl
configuration error
Plug aJA of
ThermControl
temperature sensor
not inserted
Insert plug aJA
Code "0d:0" must
be set for
Vitocrossal
ab
Controlled
operation, perhaps
DHW cylinder cold
Cylinder storage
system
configuration error:
Code "55:3" has
been set, but
plug aJB is not
plugged in
and/or
Code "4C:1" and
"4E:1" have not
been set
Insert plug aJB
and check code
ac
Control mode Return temperature
raising
configuration error:
Code "0C:1" has
been set, but
plug aJA is not
plugged in
and/or
Code "4E:0" is not
set
Insert plug aJA
and check code
ad
Butterfly valve
configuration error:
Code "0C:2",
"0C:3" or "0C:4" is
set
and
Code "4E:1" is set
With butterfly valve:
Code "4E:0" is set
Without butterfly
valve: Set code
"0C:0" or "0C:1"
bC0
Short circuit
Flue gas
temperature sensor
Check flue gas
temperature sensor
(see page 132)
5862730GB

Viessmann GC1 Specifications

General

Brand	Viessmann
Model	GC1
Category	Control Unit
Language	English