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5833 275 - 04
Vitotrans 300 Installation, Operating and Service
Issues
System Characteristics
Measures
The Vitotrans is off.
Screen is blank after touch.
Turn the Vitotrans ON.
Check main power supply breaker.
DHW is not hot enough.
DHW temperature not as hot as
desired.
Check DHW setpoint and increase if necessary.
Check heating system function and supply
temperature, increase if necessary.
Check heating system valves and ensure they are
in open position.
Check heating system side strainer for debris and
flush if necessary.
Not enough DHW flow.
DHW supply flow is insufficient
but the DHW meets desired
temperature
Check valves and ensure they are in open position.
Check DHW side strainer for debris and flush if
necessary. Heat exchangers may be blocked and
require cleaning or replacement.
DHW is too hot.
DHW supply flow is not adequate
and warmer than desired.
Check DHW setpoint and decrease if necessary.
Check heating system function and supply
temperature, decrease if necessary.
Verify all temperature sensors are installed
correctly in wells.
Fault message displayed.
Vitotrans may or may not be
operational.
Check fault message refer to page 60.
DHW storage tank is not hot
enough.
DHW storage tank does not
reach desired temperature.
Check DHW tank temperature setpoint and increase
if necessary.
Check heating system function and supply
temperature, increase if necessary.
Check tank loading pump function.
Check that the temperature sensor has been
installed correctly.
DHW storage tank is too
hot.
DHW storage tank is hotter than
desired.
Sanitation function may be enabled, contact your
heating contractor to verify settings.
Check DHW tank temperature setpoint and decrease
if necessary.
Check heating system function and supply
temperature, decrease if necessary.
Check that the tank temperature sensor is
functioning and has been installed correctly.
Note:
Carry out measures in the described order.
Troubleshooting
Operation
