Fault Messages On The Gas Condensing Module/Fuel Cell Module Programming Unit - Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors

Fault messages on the gas condensing module/fuel cell module programming unit

Control unit System characteristics
message
F.3 Regulates without return tem-
perature sensor.
F.4 Regulates without return tem-
perature sensor.
F.5 Flow rate not being moni-
tored.
F.7 No DHW heating
F.8 No DHW heating
F.9 No DHW heating
F.10 No DHW heating
F.13 Regulates as if the outside
temperature were 0 °C.
F.14 Regulates as if the outside
temperature were 0 °C.
F.29 Regulates without flow tem-
perature sensor for low loss
header.
F.30 Regulates without flow tem-
perature sensor for low loss
header.
F.37 Burner locked out
Internal circulation pump off
No room heating and no
DHW heating
F.38 Burner locked out
Internal circulation pump off
No room heating and no
DHW heating
F.49 Burner in a fault state
F.50 Burner in a fault state
F.55 Burner in a fault state
F.56 Burner in a fault state
F.57 Control mode without room
influence
Cause
Lead break, return tem-
perature sensor
Short circuit, return tem-
perature sensor
Lead break, flow sensor
Lead break, cylinder tem-
perature sensor
Short circuit, cylinder tem-
perature sensor
Lead break, outlet temper-
ature sensor DHW
Short circuit, outlet tem-
perature sensor DHW
Lead break, outside tem-
perature sensor
Short circuit, outside tem-
perature sensor
Lead break, low loss
header sensor
Short circuit, low loss
header sensor
Lead break
system pressure sensor
Short circuit
system pressure sensor
Lead break, flue gas tem-
perature sensor
Short circuit, flue gas tem-
perature sensor
Lead break, CO sensor
Short circuit, CO sensor
Lead break, room temper-
ature sensor
Troubleshooting
Measures
Check return temperature sensor
(see page 140).
Check return temperature sensor
(see page 140).
Check plug 33/X6 and cable be-
tween burner control unit and flow
sensor.
Turn the ON/OFF switch off and
back on again.
Check cylinder temperature sensor
(see page 140).
Check cylinder temperature sensor
(see page 140).
Check DHW outlet temperature
sensor (see page 140).
Check DHW outlet temperature
sensor (see page 140).
Check outside cylinder tempera-
ture sensor (see page 140).
Check outside cylinder tempera-
ture sensor (see page 140).
Check the low loss header sensor.
Check the low loss header sensor.
Check system pressure sensor.
Check system pressure sensor.
Check flue gas temperature sensor
(see page 140).
Reset device.
Check flue gas temperature sensor
(see page 140).
Reset device.
Check CO sensor.
Reset device.
Check CO sensor.
Reset device.
Check external room temperature
sensor of heating circuit or room
temperature sensor of remote con-
trol unit.
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