Viessmann Vitovalor PT2 E11T Installation And Service Instructions Manual page 105

Fault messages for gas condensing module
Fault number System characteristics
on the display
F.38 Burner blocked, heat genera-
tor circulation pump OFF
No central 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
F.58 Control mode without room
influence
F.59 Burner locked out
F.62 Burner in a fault state
F.63 Burner in a fault state
F.64 Burner in a fault state
(cont.)
Cause
Short circuit, water pres-
sure 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
Short circuit, room tem-
perature sensor
Power supply, low voltage
Temperature limiter has
responded.
Flue gas temperature lim-
iter has responded.
Flame loss in the stabilisa-
tion or operating phase
Troubleshooting
Measures
Check the water pressure sensor.
Check flue gas temperature sensor
(see page 130).
Reset burner.
Check flue gas temperature sensor
(see page 130).
Reset burner.
Check CO sensor.
Check CO sensor.
Check external room temperature
sensor of heating circuit or room
temperature sensor of remote con-
trol unit.
Check external room temperature
sensor of heating circuit or room
temperature sensor of remote con-
trol unit.
Check the power supply.
Check heating system fill level.
Check circulation pump. Vent the
system.
Reset burner.
Check heating system fill level.
Vent the system.
Reset burner after the flue system
has cooled down.
Check gas supply (gas pressure
and gas flow switch).
Check balanced flue system for
flue gas recirculation.
Check ionisation electrode (replace
if necessary):
Distance to burner gauze assem-
■
bly (see page 72)
Contamination on electrode
■
Reset burner.
105