Faults Displayed With A Fault Code; Errors Without Fault Code Display; Repairs - Viessmann SDIO Installation And Service Instructions For Contractors

Faults displayed with a fault code

Fault codes
Service instructions for the heat generator or the
Vitotronic control unit

Errors without fault code display

Fault
Solar yield is too low.
Solar circuit pump not running
or runs constantly.
Output not switched or per-
sS
manently switched.
Solar control unit is not opera-
tional.

Repairs

Check function of connected components by means of
a relay/actuator test:
Cause
Temperature sensors have
been interchanged.
Air in the solar circuit
Flow rate is too low.
Incorrect circulation
Temperature sensors have
been interchanged.
Solar circuit pump is faulty or
incorrectly connected.
Incorrect function configured.
SDIO/SM1A electronics mod-
ule is faulty.
MCB F1 has responded.
Remedy
Check temperature sensor connections.
Vent the solar circuit. Check flow rate.
Check flow rate.
■
Check connection of output
■
page 20).
Check coding address "02".
Check hydraulic connections.
■
Ensure check valves are operating correctly.
■
Check the system characteristics (see
page 21).
Check temperature sensor connections.
Check coding address "20".
Check solar circuit pump connection (see
page 20).
Check coding address "02".
Carry out a relay/actuator test (see the service
instructions for the heat generator or the
Vitotronic control unit).
Check setting of coding address "20".
Check connection of output
Carry out a relay/actuator test (see the service
instructions for the heat generator or the
Vitotronic control unit).
Check fuse F1 (see page 32).
Disconnect consumers. Connect again in se-
quence. During this, observe the behaviour of
MCB F1.
Service instructions for the heat generator or the
Vitotronic control unit
Troubleshooting
(see
sF
sS (see page 20).
19