Faults Displayed With A Fault Code; Errors Without Fault Code Display - Viessmann SM1 Installation And Service Instructions Manual

Faults displayed with a fault code

The fault codes are displayed on the heat source con-
trol unit.
Fault code dis- System characteristics
played
90 Control mode
91 Control mode
92 No solar DHW heating
94 No solar DHW heating
98 Control mode
99 Control mode
9A No solar DHW heating
9C No solar DHW heating
9E Control mode
9F Control mode
C2 Control mode
EE Control mode

Errors without fault code display

Fault
Solar yield too low
Cause
Short circuit, temperature
sensor /
Short circuit, temperature
sensor
aÖ
Short circuit, collector
temperature sensor
Short circuit, cylinder tem-
perature sensor
Lead break, temperature
sensor
/
Lead break, temperature
sensor
aÖ
Lead break, collector tem-
perature sensor
Lead break, cylinder tem-
perature sensor
No flow rate in solar circuit
or flow rate too low, or
temperature limiter has re-
sponded.
Solar control module fault
Solar control module com-
munication fault
Solar control module com-
munication fault
Cause
Temperature sensors inter-
changed.
Air in the solar circuit
Inadequate flow rate
Incorrect circulation
Measures
Check sensor
trol module (see page 15).
Check sensor
trol module (see page 15).
Check sensor
trol module (see page 15).
&
Check sensor
trol module (see page 15).
%
Check sensor
trol module (see page 15).
Check sensor
trol module (see page 15).
Check temperature sensor
the solar control module (see
&
page 15).
Check sensor
trol module (see page 15).
%
Check solar circuit pump and solar
circuit. Acknowledge fault mes-
sage.
Replace solar control module.
Check solar control module.
Check setting of coding address
54: 54:3 or 54:4 must be set (sets
automatically).
Check solar control module.
Check KM BUS subscriber list
("Service functions"
subscriber").
Remedy
Check temperature sensor connection. See the
relevant system example.
Vent solar circuit and check flow rate.
Check flow rate.
■
Check connection of output
■
page 14).
Check setting of coding address 02.
Check hydraulic connections. See the relevant
■
system example.
Ensure check valves are operating correctly.
■
Check the system characteristics (see
page 15).
Troubleshooting
at the solar con-
/
at the solar con-
aÖ
at the solar con-
&
at the solar con-
%
at the solar con-
/
at the solar con-
aÖ
& at
% at the solar con-
"KM-BUS
sF (see
13