Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 98

Troubleshooting
Fault messages
(cont.)
Message code System characteristics
F.92 Function of connected com-
ponents in emergency mode
F.93 Function of connected com-
ponents in emergency mode
F.94 Function of the relevant elec-
tronics module in emergency
mode
F.99 Function of the electronics
modules connected to Plus-
Bus not available
98
Cause
ADIO electronics module
communication error
M2IO electronics module
communication error
SDIO electronics module
communication error
Communication error
PlusBus
Measures
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check connections on
■
ADIO electronics module.
Check whether components are
■
wrongly connected.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace
ADIO electronics module.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check connections on
■
M2IO electronics module.
Check whether components are
■
wrongly connected.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace
M2IO electronics module.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check connections on
■
SDIO electronics module.
Check whether components are
■
wrongly connected.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace
SDIO electronics module.
Check the settings in the com-
■
missioning assistant. Adjust set-
tings if required.
Check connections at plug 74 of
■
the HPMU electronics module.
Wall mounted indoor unit:
■
Check the connections at plug 74
on the connection socket on the
underside of the appliance.
Check whether components are
■
wrongly connected.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace
HPMU electronics module.