Viessmann Vitotronic 100 Installation And Service Instructions Manual page 49

Fault display
(cont.)
Displayed fault System characteristics
code
94 No solar DHW heating
98 Control mode
99 Control mode
9A No solar DHW heating
9b Control mode
9C No solar DHW heating
9E Control mode
9F Control mode
b0 Control mode
b1 Control mode
b5 Control mode
b7 Boiler is regulated by the
temperature controller.
Cause
Short circuit, cylinder tem-
perature sensor,
connection of temperature
sensor at the solar
%
control module or sensor
at S2 of the Vitosolic.
Lead break, temperature
sensor / ,
connection at the solar
control module, type SM1.
Lead break, temperature
sensor ,
aÖ
connection at the solar
control module, type SM1.
Lead break, collector tem-
perature sensor,
connection of temperature
sensor at the solar
&
control module, type SM1
or sensor at S1 of the
Vitosolic.
Lead break, temperature
sensor,
connection at S3 of the
Vitosolic.
Lead break, cylinder tem-
perature sensor,
connection of temperature
sensor at the solar
%
control module, type SM1
or sensor at S2 of the
Vitosolic.
No flow rate or flow rate
too low in the solar circuit,
or temperature limiter has
responded.
Fault, solar control mod-
ule, type SM1 or Vitosolic.
Displayed if a fault occurs
at these devices that has
no fault code in the
Vitotronic.
Short circuit, flue gas tem-
perature sensor
Communication error, pro-
gramming unit
Internal fault
Coding card fault
Troubleshooting
Measures
Check sensor at the solar control
unit (see separate installation and
service instructions).
Check temperature sensor
separate installation and service
instructions).
Check temperature sensor
separate installation and service
instructions).
Check sensor at the solar control
unit (see separate installation and
service instructions).
Check sensor at the solar control
unit (see separate installation and
service instructions).
Check sensor at the solar control
unit (see separate installation and
service instructions).
Check solar circuit pump and solar
circuit (see separate installation
and service instructions).
Acknowledge fault message.
Check solar control unit (see sepa-
rate installation and service in-
structions).
Check flue gas temperature sensor
(see page 51).
Check connections and replace
programming unit if required.
Check PCB is plugged in correctly
(see parts list)
Plug in or replace the boiler coding
card (see page 10).
(see
/
aÖ (see
49