Buffer Outlet Temp - Viessmann VITOTRONIC 200 Service Instructions Manual

Troubleshooting
Message overview
Cause
Short circuit, external heat generator boiler water tem-
perature sensor

65 Buffer outlet temp.

Operation with temperature value of flow temperature
sensor in the secondary circuit of the lead heat pump
Cause
Short circuit/lead break, buffer outlet temperature sen-
sor
66 Swimming pool flow t.
Operation with temperature value of flow temperature
sensor in the secondary circuit of the lead heat pump
Cause
Short circuit/lead break, swimming pool flow tempera-
ture sensor
68 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
Lead break, buffer temperature sensor
6B Boiler temp.sensor ext
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.
Cause
Lead break, external heat generator boiler water tem-
perature sensor
6E Flow sens condenser
No central cooling, no defrosting
■
■ Max. flow temperature in secondary circuit: Secon-
dary circuit return temperature plus 5 K
86
(cont.)
Measure
Check resistance value (NTC 10 k
"Controller and sensor PCB".
Action
Check resistance value (NTC 10 k
"Controller and sensor PCB".
Action
Check resistance value (NTC 20 k
"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".
Measure
Check resistance value (NTC 10 k
"Controller and sensor PCB".
) at plug F20: See
Ω
) at plug F23: See
Ω
) at plug F21: See
Ω
) at plug F4: See
Ω
) at plug F20: See
Ω