Viessmann Vitotwin 300-W - Fault messages

123
Explanatory notes on resetting (see
table below)
AR Automatic restart after the fault
has been remedied
ARP Automatic restart after the fault
has been remedied and mains
voltage disconnected
UR
Press
SR Service reset (see page 122)
NRP No restart possible, replace PCB
Fault mes-
sage
Cause Remedy Re-
set-
ting
"10: Outside
sensor"
Short circuit or lead break to
outside temperature sensor.
Check outside temperature
sensor (see page 139)
"20: Boiler
sensor 1"
Short circuit or lead break to
boiler temperature sensor.
Check the boiler water tem-
perature sensor (see
page 141)
AR
"30: Flow
sensor 1"
Short circuit or lead break to
flow temperature sensor,
heating circuit 1.
Check flow temperature sen-
sor (see page 146)
"32: Flow
sensor 2"
Short circuit or lead break to
flow temperature sensor,
heating circuit 2.
"40: Return
sensor 1"
Short circuit or lead break to
return temperature sensor.
Check the return tempera-
ture sensor (see page 143)
"50: DHW
sensor 1"
Short circuit or lead break to
cylinder temperature sensor
B3.
Check the cylinder tempera-
ture sensor (see page 140)
"60: Room
sensor 1"
Short circuit or lead break to
room thermostat, heating cir-
cuit 1.
Check room thermostat and
connecting cable.
"65: Room
sensor 2"
Short circuit or lead break to
room temperature sensor,
heating circuit 2.
"68: Room
sensor 3"
Short circuit or lead break to
room temperature sensor,
heating circuit 3.
"70: Buffer
sensor 1"
Short circuit or lead break to
buffer temperature sensor.
Check buffer temperature
sensor (see page 140)
"71: Buffer
sensor 2"
"72: Buffer
sensor 3"
Troubleshooting
Fault messages
5618 294 GB
Service