Cylinder Sensor Top - Viessmann VITOTRONIC 200 Service Instructions Manual

Message overview
(cont.)
Cause
Short circuit, bottom cylinder temperature sensor

58 Cylinder sensor top

■ If only the upper cylinder temperature sensor is
present: No DHW heating
If an additional lower temperature sensor is installed:
■
DHW heating possible, switched on and off via this
sensor
Cause
Lead break, top cylinder temperature sensor
5A Cylinder sensor bottom
If only the lower cylinder temperature sensor is
■
present: No DHW heating
■ If an additional upper temperature sensor is installed:
DHW heating possible, switched on and off via this
sensor
Cause
Lead break, bottom cylinder temperature sensor
60 Buffer temp. sensor
For central heating:
■ Buffer cylinder is heated once every hour.
Heating stops when the temperature at the secon-
■
dary circuit return temperature sensor reaches the
set value for heating the buffer cylinder.
Cause
Short circuit, buffer temperature sensor
63 Boiler sensor ext HS
■ Mixer external heat generator opens fully as soon as
the external heat generator is switched on.
■ Frost protection monitoring of external heat genera-
tor is not active.
Measure
Check resistance value (NTC 10 k
terminals X25.7/X25.8: See "Controller and sensor
PCB".
Measure
Check resistance value (NTC 10 k
terminals X25.5/X25.6: See "Controller and sensor
PCB".
Measure
Check resistance value (NTC 10 k
terminals X25.7/X25.8: See "Controller and sensor
PCB".
For central cooling with heating water/coolant buffer
cylinder:
Heating water/coolant buffer cylinder is cooled once
■
every hour.
■ Cooling stops when the temperature at the secon-
dary circuit return temperature sensor reaches the
set value for cooling the heating water/coolant buffer
cylinder.
Measure
Check resistance value (NTC 10 k
"Controller and sensor PCB".
Troubleshooting
) at plug F7 or at
Ω
) at plug F6 or at
Ω
) at plug F7 or at
Ω
) at plug F4: See
Ω
85