Viessmann VITODENS 100-W Installation And Service Instructions Manual page 48

Troubleshooting
Fault messages
(cont.)
Displayed fault System characteristics
code
13 Regulates as if the outside
temperature were 0 °C.
14 Regulates as if the outside
temperature were 0 °C.
49 Burner in a fault state
50 Burner in a fault state
57 Normal operation without
room influence
58 Normal operation without
room influence
59 Burner blocked, boiler circuit
pump off. No central heating,
no DHW heating
62 Burner in a fault state
48
Cause
Lead break, outside tem-
perature sensor
Short circuit, outside tem-
perature sensor
Lead break, flue gas tem-
perature sensor
Short circuit, flue gas tem-
perature sensor
Lead break, room temper-
ature sensor
Short circuit, room tem-
perature sensor
Power supply, low voltage
High limit safety cut-out
has responded.
Measures
Check the operating mode set-
■
ting in the commissioning assis-
tant and remedy if necessary.
Check outside temperature sen-
■
sor and connection to sensor
(terminal 4).
Measure voltage at sensor input
■
on HBMU heat management
unit. Set value: 3.3 V with sen-
–
sor disconnected
Replace faulty component if neces-
sary.
Check outside temp. sensor and
connection to sensor (terminal 4).
Replace faulty components if nec-
essary.
Check flue gas temperature sen-
sor.
Reset the appliance.
Check flue gas temperature sen-
sor.
Reset the appliance.
Check commissioning setting of
■
remote control.
Check plug and cable of external
■
room temperature sensor, heat-
ing circuit.
If no external room temperature
■
sensor installed, replace Vitotrol
programming unit.
Check plug and cable of external
room temperature sensor, heating
circuit.
If no external room temperature
sensor installed, replace Vitotrol
programming unit.
Check mains voltage.
If voltage is correct and the fault
occurs repeatedly, replace the fan
unit.
Check heating system fill level.
■
Check pre-charge pressure in di-
■
aphragm expansion vessel. Ad-
just to required system pressure.
Check whether flow rate is suffi-
■
cient (circulation pump).
Check function of 3-way diverter
■
valve. Vent the system.
Reset the appliance.