48
Displayed fault
code
System characteristics
Cause
Measures
13
Regulates as if the outside
temperature were 0 °C.
Lead break, outside tem-
perature sensor
■
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.
14
Regulates as if the outside
temperature were 0 °C.
Short circuit, outside tem-
perature sensor
Check outside temp. sensor and
connection to sensor (terminal 4).
Replace faulty components if nec-
essary.
49
Burner in a fault state
Lead break, flue gas tem-
perature sensor
Check flue gas temperature sen-
sor.
Reset the appliance.
50
Burner in a fault state
Short circuit, flue gas tem-
perature sensor
Check flue gas temperature sen-
sor.
Reset the appliance.
57
Normal operation without
room influence
Lead break, room temper-
ature sensor
■
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.
58
Normal operation without
room influence
Short circuit, room tem-
perature sensor
Check plug and cable of external
room temperature sensor, heating
circuit.
If no external room temperature
sensor installed, replace Vitotrol
programming unit.
59
Burner blocked, boiler circuit
pump off. No central heating,
no DHW heating
Power supply, low voltage Check mains voltage.
If voltage is correct and the fault
occurs repeatedly, replace the fan
unit.
62
Burner in a fault state
High limit safety cut-out
has responded.
■
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.
Troubleshooting
Fault messages
(cont.)
6174240
Diagnosis
