Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 99

Fault messages
(cont.)
Message code System characteristics
F.100 Function of the electronics
modules connected to Plus-
Bus not available
F.101 Function of the electronics
modules connected to Plus-
Bus not available
F.102 No WiFi
F.103 No operation possible
F.104 Depending on configuration
of EM-EA1 extension (DIO
electronics module)
F.111 Refrigerant circuit off
F.112 Refrigerant circuit off
Cause
Short circuit, PlusBus
Voltage error PlusBus
Communication error, Wi-
Fi communication module
HMI programming unit
communication error
External fault message in-
put active
Lead break, liquid gas
temperature sensor, heat-
ing
Short circuit, liquid gas
temperature sensor, heat-
ing
Troubleshooting
Measures
Check PlusBus power supply at
■
HPMU electronics module: Iso-
late all PlusBus components con-
nected. Reconnect each one in
turn.
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 there is a short
■
circuit at the PlusBus cables.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace
HPMU electronics module.
Check PlusBus power supply at
■
HPMU electronics module: Iso-
late all PlusBus components con-
nected. Reconnect each one in
turn.
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 there is a short
■
circuit at the PlusBus cables.
Isolate the system from the pow-
■
er supply. Restart the system.
If the fault persists, replace
HPMU electronics module.
Replace the WiFi communication
module.
Replace HMI programming unit.
Check the settings in the com-
■
missioning assistant for fault
message input. Adjust settings if
required.
Check connected external appli-
■
ance.
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X21.1/X21.2 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
Check resistance value
(NTC 10 k ) at connec-
Ω
tion X21.1/X21.2 of the VCMU re-
frigerant circuit controller. Replace
sensor if required.
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