Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 117

Fault messages on the gas condensing...
Control unit System characteristics
message
F.92 Affected extension functions
in emergency mode
F.93 Affected extension functions
in emergency mode.
F.94 Reheating suppression disa-
bled.
F.100 Connected electronics mod-
ule functions in emergency
mode.
F.104 Depending on configuration
adaptor EM-EA1 (electronics
module DIO)
F.142 Burner in a fault state
F.160 Control mode
F.161 Burner in a fault state
F.162 Burner in a fault state
F.163 Burner in a fault state
F.182 No DHW heating
F.183 No DHW heating
F.184 Burner in a fault state
F.185 Burner in a fault state
F.192/02F0 Fuel cell not operating
F.193/02F1 Fuel cell not operating
F.194/02F2 Fuel cell not operating
(cont.)
Cause
ADIO electronics module
communication error
M2IO electronics module
communication error
SDIO/SM1A electronics
module communication er-
ror
Voltage error PlusBus
External fault message in-
put active
Communication error, fan
unit
No communication via
CAN BUS to connected
electronics modules
Data memory access error Turn device off and on again.
Processor low voltage
Memory access checksum
error
Short circuit, outlet tem-
perature sensor
Lead break, outlet temper-
ature sensor
Short circuit, common flow
temperature sensor/high
limit safety cut-out
Lead break, common flow
temperature sensor/high
limit safety cut-out
Not filled with distilled wa-
ter
Filling with distilled water
was not confirmed during
commissioning
Draining of distilled water
was not confirmed
Troubleshooting
Measures
Check connections and cables be-
tween ADIO electronics module
and heat management unit.
Check connections on M2IO elec-
tronics module and connection to
heat management unit.
Check connections on SDIO/SM1A
electronics module and connection
to heat management unit.
Check the PlusBus connecting ca-
ble.
Check connected external device.
Check fan unit connecting cable.
Reset device.
Check heat management unit con-
nections.
Reset device.
Reset device.
Turn device off and on again.
Check connecting cable.
Reset device.
Turn device off and on again.
Reset device.
Check the outlet temperature sen-
sor.
Check the outlet temperature sen-
sor.
Check flow temperature sensor/
high limit safety cut-out: See
page 140.
Reset device.
Check flow temperature sensor/
high limit safety cut-out: See
page 140.
Reset device.
Carry out fuel cell module commis-
sioning again.
Carry out fuel cell module commis-
sioning again.
Drain out distilled water again and
confirm draining.
117